Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

  • Why this rating is the most accurate.
  • Our editors gather deep company info.
  • Performance is Guaranteed.

Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified HVAC Companies Rated Highest in Quality?

An HVAC repairman repairs a home heating and cooling system. Photo: Service Champions (2012)

CONCORD — You are the customer. If your goal is to choose an air conditioning, heating and ventilation contractor that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified HVAC contractor. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated HVAC company and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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DIAMOND CERTIFIED EXPERT CONTRIBUTORS IN THE Contra Costa County – Air Conditioning, Heating & Ventilation (HVAC) CATEGORY

Kevin Comerford is president of Service Champions, a Diamond Certified company. He can be reached at (925) 444-4444 or by email.

Kevin Comerford

diamond certified contributor profile and expert article

Kevin Comerford: Taking the Lead

By James Florence, Diamond Certified Resource Reporter

PLEASANTON — Kevin Comerford has roots in the HVAC industry, but it took some time for him to realize his place in his family’s legacy. “My father, Don Comerford, started his business, Comerford Heating and Air, in 1971, so I basically grew up in the industry,” he recounts. “After graduating from Cal Poly with a degree in journalism, I went to work for the San Luis Obispo Chamber of Commerce. I enjoyed working with small-business owners so much that it renewed my interest in my parents’ business. I was also fascinated with the innovative developments that were happening in the HVAC industry at the time. I got involved and I’ve been doing it ever since.”

Today, as president of Service Champions, Kevin says his favorite part of his job is developing people. “Another reason I got involved in HVAC was the opportunity I saw to incorporate my passion for developing people. That’s why my favorite part of my job is interacting with our team members and training them on different skill sets—not just work skills, but life skills as well.”

Born and raised in Pleasanton, Kevin espouses his appreciation for life in the Bay Area. “I’m a homegrown native of Pleasanton and I love being part of this community. In general, I love living and working in the Bay Area—the people are great and there’s a tremendous amount of opportunity for businesses, as well as plenty of activities and events to partake in. There’s always something going on.”

When he’s not working, Kevin stays busy with a variety of active pastimes. “I love to watch and play sports,” he details. “I play tennis competitively and typically play three to four times a week.” Additionally, Kevin enjoys spending time with his wife, Carolyn, and their three children, Emily, Brendan and Landon. “I love doing things with my family, especially outdoor activities. During the summer, we spend a lot of time on the lake.”

In his life and career, Kevin espouses the virtues of good leadership. “I’m a firm believer in the phrase, ‘If you lead, the world will follow,’” he says. “The world needs more leaders. I believe I can make a difference by taking a leadership role, whether in my business, my community or my church.”

When asked what he’d do if he were to retire tomorrow, Kevin says he’d continue to focus on developing people. “Like I said, that’s my passion, so I would find other avenues for doing that. It might be helping my boys become better students or baseball players, or doing volunteer work in my community. I would also like to help other small-business owners and share the secrets of Service Champions’ success.”

Ask Me Anything!

Q: What are your favorite sports teams?

A: The Oakland Raiders, Oakland A’s, San Jose Sharks and Golden State Warriors. What can I say, I have an East Bay slant!

Q: Are you an early bird or a night owl?

A: An early bird—I wake up at 5am every day.

Q: What’s your favorite season?

A: Summer, because I get to be outdoors and spend time relaxing with my family at our lake house.

Q: What’s the best gift you’ve ever received?

A: In 1985, I received a jet ski from my parents.

Q: What’s your favorite snack?

A: Nuts, carrots and hummus.

Read more

How to Measure Attic Insulation


PLEASANTON — Attic insulation is a key component of an energy-efficient home. By keeping hot and cold outside air from entering the home, a well-insulated attic can go a long way toward minimizing your heating and air conditioning bills. However, simply having… Read more

5 Steps to Prepare Your HVAC System for Winter


PLEASANTON — Following the heat of summer and the mildness of fall, the cold winter weather brings an entirely different set of heating and ventilation needs for the home. To ensure your HVAC system is equipped for optimal performance, consider these five… Read more

Expert Video Tip

Video: 5 Ways to Prepare Your HVAC System for Winter

Complete Video Transcription:

PLEASANTON — Sarah Rutan: As winter draws near, you’ll want to make sure your HVAC system is equipped for optimal performance. Today we’re in Pleasanton with Diamond Certified… Read more

Steve Moore is a veteran of the HVAC industry and owner of Moore Mechanical, Inc., a Diamond Certified company since 2007. He can be reached at (925) 560-1505 or by email.

Steve Moore

diamond certified contributor profile and expert article

Steve Moore: A Fresh Opportunity

By James Florence, Diamond Certified Resource Reporter

DUBLIN — As a union tradesman, Steve Moore was in between projects when he decided to take advantage of a fresh opportunity. “Before I got into residential HVAC, I was working out of a union shop in San Francisco,” he recounts. “I had just finished a big project and was waiting around for the next job, as is often the case with union work, and in the meantime I started doing jobs for friends and family. It wasn’t long before I realized waiting for union jobs didn’t make much sense when I had people ready to give me work. Ultimately, I decided to leave the union and start doing residential HVAC work, and that’s what I’ve been doing ever since.”

Today, as owner of Moore Mechanical, Inc., Steve says his favorite part of his job is interacting with employees and customers alike. “I enjoy training my employees and watching them grow and be successful in the industry. Of course, I also get a lot of satisfaction from providing our customers with a high level of expertise and professionalism.”

A resident of Danville (where he lives with his wife, Wendy), Steve expresses his appreciation for the character of Bay Area work and life. “We’re very lucky in that we have both great weather and access to outdoor activities with the beach and mountains close by. From a business perspective, the Bay Area offers everything from excellent demographics to cutting-edge technology, so it’s great being able to offer the best systems to customers who appreciate quality.”

Outside of work, Steve engages in a variety of active pastimes, from outdoor pursuits to charitable activities. “I’m an avid cyclist and enjoy both mountain biking and road biking, the latter of which I do somewhat competitively,” he says. “I also do a lot of camping in the mountains with my family. Other than that, my wife and I are very involved in our church and like taking part in missions, both locally and abroad.”

In regard to a professional philosophy, Steve espouses the importance of the customer experience. “We’re committed to providing our customers with a great experience from start to finish,” he affirms. “This starts with the initial phone call and goes all the way through the job’s completion. We want each customer to feel great about the decision they made in hiring us, to the point where they can’t help but tell their friends and family about it.”

When asked the first thing he’d do if he were to retire tomorrow, Steve says he’d take his cycling hobby to a new locale. “I’d go for a week-long cycling trip in Italy. Of course, long-term, I would continue contributing to my business through training and teaching, and just make sure it continues to be healthy going into the future.”

Ask Me Anything!

Q: Coffee or tea?
A: Coffee.

Q: If you could live in the city or the country, which would you choose?
A: The country.

Q: What’s your favorite sports team?
A: The San Francisco 49ers.

Q: Did you play any high school sports?
A: I played football and wrestled.

Q: Do you collect anything?
A: Old-fashioned, wall-mounted thermometers.

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How to Improve Indoor Air Quality


DUBLIN — Did you know the air inside residential homes can be up to 90% more polluted than the air outside? Due to a comparative lack of ventilation, it’s easy for airborne contaminants like dust, dander, mold, and volatile organic… Read more

Addressing the Big Picture with HVAC Estimates


DUBLIN — When getting an estimate for a new heating, cooling and ventilation system, make sure it addresses the big picture. First of all, the estimate should address all aspects of system operation, not just the HVAC unit itself. The estimate… Read more

Expert Video Tip

Technology to Improve Indoor Air Quality

Complete Video Transcription:

DUBLIN — Steve Moore: So, today I'd like to share with you a few tips regarding your IAQ. IAQ means indoor air quality. You know,… Read more

Kim Haddon is owner of Haddon Heating & Cooling, a Diamond Certified company since 2010. She can be reached at (925) 521-1380 or by email.

Kim Haddon

diamond certified contributor profile and expert article

Kim Haddon: Learning a New Language

By James Florence, Diamond Certified Resource Reporter

CONCORD – When she got married, Kim Haddon knew she’d be sharing a home with her husband, but she never thought that one day she’d be working side by side with him in a professional environment. “My husband, Dave, has been involved in HVAC from a young age, having worked for his father’s company,” she explains. “After returning to the family business in the late ’90s, Dave decided to expand the company’s operations from mainly commercial work to full residential services.” It was at this point that Kim was presented with an opportunity to become a participant in her husband’s profession. “As the business’ focus shifted to residential work, Dave asked to have my involvement,” she says. “I started out answering phones in the office and things just progressed from there.”

Not satisfied with remaining a novice in her new vocational role, Kim applied herself and gradually developed a thorough knowledge of HVAC technology and techniques. “When I started, I didn’t really know anything about the industry,” she says. “A lot of the terms were completely foreign to me, so it really felt like I was learning a new language.” Thirteen years later, Kim continues to demonstrate her fluency in industry dialect as co-owner of Haddon Heating & Cooling.

Born and raised in rural Minnesota, Kim relocated to Northern California after marrying Dave, a native of the North Bay. Having experienced her share of harsh Midwestern winters, she says the temperate local climate is one of her favorite attributes of life in the Bay Area. “I love being able to enjoy the outdoors year-round. I remember that soon after I moved here, I was sunbathing at the beach in January and called my family in Minnesota to tell them about it!”

Outside of work, Kim enjoys engaging in a variety of outdoor activities with Dave and their three children, Jesse, Rachael and Joseph. “We do a lot of weekend camping trips,” she says. “One of our favorite places to go is Lake Tahoe—there are things to do all year long, from skiing in the winter to boating in the summer.”

In her life and career, Kim espouses the importance of working hard to achieve one’s goals. “If you’re going to do something, you may as well give your all and do it to the best of your ability,” she says. “Whatever it is you’re aiming for, if you just keep at it and put in your time, you’ll achieve it. For me, it was becoming fluent in the language of the HVAC industry. It took a lot of time and hard work, but it eventually paid off.”

Ask Me Anything!

Q: What’s your favorite restaurant?
A: The Dead Fish in Crockett.

Q: What were you most known for in high school?
A: Music—I sang in choir and also played violin and piano.

Q: What’s your favorite film genre?
A: Science fiction.

Q: Do you collect anything?
A: Rare and interesting coins. I used to work as a waitress, and I would always look through my change at the end of the night for unusual coins.

Q: What’s the best gift you’ve ever received?
A: My three children.

Read more

How to Locate and Replace Your Furnace Filter


CONCORD — While routine furnace filter replacement remains a commonly neglected aspect of home maintenance, for some, the problem starts with locating the filter in the first place. Here are a few common places to look: Internally: In many cases, the… Read more

Expert Video Tip

Video: Find, Remove and Change Your Filters

Complete Video Transcription:

CONCORD — Host, Sarah Rutan: An important part of maintaining your home is learning how to find, remove and change your filters. Today, we're in Concord with… Read more




  • Carrier

  • Rheem

  • Trane

  • Lennox

  • Mitsubishi

  • Amana

  • Bryant

  • Ares

  • First Air

  • Goodman

Arcoaire HVAC Systems
General Electric HVAC Equipment
Amana HVAC Systems
Comfortmaker HVAC Systems
Bryant HVAC Systems
Buderis HVAC Systems
Emerson Heating & Cooling Systems
Evcon HVAC Systems
Coleman HVAC Systems
Armstrong Heating & Cooling Systems
Burnham Heating & Cooling Systems
Carrier Heating & Cooling
York HVAC Systems
American Standard
Goodman HVAC Systems
Haier Cooling & Heating Systems
Hallmark Heating & Cooling Systems
Heil Heating & Cooling Systems
Lennox Cooling & Heating Systems
Janitrol Heating & Cooling Systems
Trane HVAC Equipment
Frigidaire HVAC Equipment
Mitsubishi HVAC
Samsung HVAC Equipment
Sanyo Heating & Cooling Systems
Intertherm HVAC Systems
Kenmore HVAC Systems

HVAC system service
heating & cooling service
HVAC repair
cooling & heating installation
air conditioning service
natural ventilation unit installation & service
HVAC unit replacement
residential HVAC service
commercial HVAC service
heating and cooling system repair
HVAC troubleshooting
HVAC heat pump repair
emergency HVAC servicing
HVAC work
heating repair
HVAC duct cleaning
HVAC sales & installation
air conditioner installation
HVAC ductwork installation
HVAC efficiency testing
HVAC system design
furnace installation
HVAC ductwork repair
ventilation system service
ventilation duct cleaning
ventilation filter installation
HVAC blower service

Bay Point
Bethel Island
Discovery Bay
El Cerrito
El Sobrante
Hilltop Mall
Los Medanos
North Richmond
Pleasant Hill
Point Richmond
Port Chicago
Port Costa
Rheem Valley
San Pablo
San Ramon
Tara Hills
Vine Hill
Walnut Creek
Walnut Heights
West Pittsburg


American Backflow Prevention Association (ABPA) (www.abpa.org/)
Air Conditioning Contractors of America (ACCA) (www.acca.org/)
Associated General Contractors of America (AGC of America) (www.agc.org/)
Associated Specialty Contractors (ASC) (www.assoc-spec-con.org/)
American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) (www.ashrae.org/)
California Sheet Metal and Air Conditioning Contractors National Association (CALSMACNA)
(www.cal-smacna.org/)Contractors State License Board (CSLB) (www.cslb.ca.gov/)
Mechanical Contractors Association of America (MCAA) (www.mcaa.org/)
National Board of Boiler and Pressure Vessel Inspectors (NBBPVI) (www.nationalboard.org/)
North Coast Builders Exchange (NCBE) (www.ncbeonline.com/)
Heating, Cooling Contractors Association (PHCCA) (www.phccweb.org/)
Refrigeration Service Engineers Society (RSES) (www.rses.org/)
U.S. Environmental Protection Agency (EPA) (www.epa.gov/)
American Boiler Manufacturers Association (ABMA) (www.abma.com/)
Hydronic Heating Association (www.comfortableheat.net/)

Know What You Want
Know What You Want from Your New HVAC System

Before you interview any heating, cooling and ventilation system contractors in Contra Costa County, you’ll want to have some knowledge about HVAC systems and your heating and cooling needs. Think about the answers to these questions to get you started in the right direction:

  • Do I want a Diamond Certified company that is rated best in quality and backed by the Diamond Certified Performance Guarantee?
  • What is my budget for new HVAC system or heating and air conditioner repair?
  • What do I like about my current HVAC unit?
  • What would I change about the HVAC system that’s currently installed in my house?
  • Are there any specifics that will make this job more complicated than average or need to be considered during the planning phase (i.e. planning an addition to the home, special requests for the brand or type of system installed, location of the job site or a narrow driveway that may make it hard for work trucks to get to the home, a short timeframe, etc.)?
  • Do I plan to live in this home long-term? Or is it a rental property or a house I plan to sell?
  • What qualities or characteristics do I want in a Contra Costa County HVAC contractor?
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What To Ask In Person
Questions to Ask Heating, Cooling and Ventilation Companies in Person

The following questions will get you started as you interview local HVAC contractors in person.

Give each Contra Costa County heating and cooling contractor you interview a chance to answer the same questions so you’ll be able to compare their answers.

  • Do you also recommend new heating and air conditioning ducts, or will the existing ducts work with my new heating and cooling system?
  • How much time will the HVAC job take, from measuring my home and ordering the new heating and air conditioning system to installation?
  • Will my new heating, cooling and ventilation system make my home more comfortable and reduce my electric bills?
  • Do you have any recent projects in my area of Contra Costa County where I can see the completed HVAC installation and talk with the homeowners?
  • Do you have customer references I can call?
  • How would I handle any future service issues? Are you responsible for warranty work if there’s ever a problem with my new HVAC system?
  • What can I do to make the heater and air conditioner purchase / installation process easier?
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  • What To Ask References
    Previous Customers' Experiences with Local Window Contractors in Contra Costa County

    It’s best to choose a Diamond Certified heating and cooling contractor because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a HVAC contractor in Contra Costa County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If you can’t find a Diamond Certified HVAC company within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by the heating and air conditioning companies. Keep in mind, though, that references provided to you by the contractors are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from local HVAC companies are often cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied. Then call several of the references and ask them specific questions about the heating and air conditioning contractor you’re considering. Here are a few sample questions:

    1. Were you satisfied with the HVAC installation and the customer service from _(HVAC company name)_?
    2. What type of job did they do for you (HVAC repair, cooling & heating installation, residential air conditioning service, HVAC unit replacement, furnace repair, etc.)?
    3. Did the Contra Costa County heating and cooling contractor you hired complete the work on time?
    4. Did the contractor keep you up-to-date on the status of the project?
    5. Were there unexpected costs? If so, what were they for and were they avoidable?
    6. If you live in a smaller town such as Alamo, Bay Point, Canyon, Pinole, Cowell, Bethel Island or Diablo, did the HVAC company charge extra to travel to your home?
    7. Did the HVAC installers show up on time?
    8. Did they clean up after installing your new furnace or air conditioning system?
    9. If you need a new furnace or HVAC repairs in the future, would you use this contractor again?
    10. Would you recommend them to friends or family?
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  • Review Your Options
    Hire Good Home Heating & Cooling Companies in Contra Costa County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    A new HVAC system, furnace or home air conditioner is a big investment that should keep you comfortable for years to come. So before deciding on the best heating and cooling contractor in Contra Costa County for you, consider the following questions and use your interview notes to choose the best HVAC company for you.

    • Can a local heating and cooling contractor in Contra Costa County meet your needs in terms of products, scheduling, installation and service?
    • Are the Contra Costa County HVAC company representatives knowledgeable on the furnaces and air conditioners they install? Can they tell you which brands and systems best meet your needs and why (i.e. energy efficient furnaces, high-efficiency air conditioners, new furnace installation, Trane HVAC systems, Carrier heaters and AC systems, etc.)
    • Is the HVAC installer sensitive to your budget? Can they offer various brands and heating and cooling systems to fit your needs? Most heating and cooling companies can give you bids for good, better and best options that give you more control over the price and efficiency of your new furnace and air conditioner.
    • Do the written warranties and guarantees protect you and your new heating, cooling and ventilation system?
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  • How To Work With
    Get the Most Value from Your New HVAC System

    Most homeowners want the best value from their new HVAC system. But sacrificing quality to save money on a new heating and cooling system may defeat the long-term value you can get from a high-quality, efficient HVAC system installed by experienced and skilled heating and air conditioning professionals.

    To help encourage good HVAC contractors in Contra Costa County to bid on your job, remember:

    • Look for good value, not just the lowest price. The first question most homeowners ask heating and cooling companies is how much their new furnace and air conditioner will cost, so it’s important to show them you understand the significance of quality products, skilled installation and long-term value.
    • Be upfront with heating and cooling companies if you’re interviewing other local HVAC contractors, but assure them that you’re accepting three fair bids, not dozens of lowball bids.
    • Shop among local heating and cooling companies in Contra Costa County. Most HVAC installers like to work in the local area because it allows them to provide better service in a more timely manner. Shopping locally shows contractors you’re not looking for cheap HVAC installations, as some fly-by-night furnace and air conditioning services travel long distances to install discounted products that local contractors may not be able to compete with price-wise.
    • Take the long view when purchasing HVAC equipment. Investing in a quality system and having it installed by professional tradesmen can save you more money in the long run than buying a cheaper system or hiring discount HVAC installers.
    • Remember that the installation can be as important to the long-term reliability and functionality of your heating, cooling and ventilation system. Even the best systems require proper installation and maintenance to operate safely and at maximum efficiency.

    Request a Written Estimate and Contract from Your Contra Costa County Heating and Cooling Specialist
    When you’ve found a Contra Costa County heating and cooling company that meets all of your requirements, it’s time to sort out the details. Ask for a written estimate and contract that includes a confirmation of the brand and quality of your new HVAC system, any installation details, the price of the system and the labor for installation, and any applicable warranties and HVAC maintenance agreements. You should also get in writing a timeline that details the job start date, major milestones and the expected final installation date.

    You may also write in any additional requests or items you and the heating and cooling company representative verbally have agreed upon. Once you’re happy with the contract and understand all the terms of the agreement, you can sign with confidence.

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  • Be a Good Customer
    Review Your HVAC Service Invoice with Your Local Heating and Cooling Contractor

    Once your HVAC system is installed, your heating and cooling professional should supply you with a written invoice. This invoice generally will list:

    • The name, physical address and license number of the heating and cooling contractor.
    • A list of all HVAC work performed.
    • An itemized list of the new furnace, air conditioner and ventilation system installed and any replacement parts needed.
    • The total heating and cooling unit installation cost, including an itemized amount due for labor.
    • Any applicable warranties or guarantees.

    Once you’ve reviewed the invoice, it’s smart to compare the work that was actually done to the written document. Ask your cooling and heating contractor to show you the new system installation or HVAC repairs that were done. Check the products and work against the line-item invoice. This is also a good time to have the furnace contractor explain the HVAC unit to you in detail and show you the best steps to take in running and maintaining your new system. If you have questions about the work that was done or any items that seem to be missing or in conflict with your written contract or invoice, this is the time to ask your contractor.

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Check The Work
Review Your HVAC Service Invoice with Your Local Heating and Cooling Contractor

Once your HVAC system is installed, your heating and cooling professional should supply you with a written invoice. This invoice generally will list:

  • The name, physical address and license number of the heating and cooling contractor.
  • A list of all HVAC work performed.
  • An itemized list of the new furnace, air conditioner and ventilation system installed and any replacement parts needed.
  • The total heating and cooling unit installation cost, including an itemized amount due for labor.
  • Any applicable warranties or guarantees.

Once you’ve reviewed the invoice, it’s smart to compare the work that was actually done to the written document. Ask your cooling and heating contractor to show you the new system installation or HVAC repairs that were done. Check the products and work against the line-item invoice. This is also a good time to have the furnace contractor explain the HVAC unit to you in detail and show you the best steps to take in running and maintaining your new system. If you have questions about the work that was done or any items that seem to be missing or in conflict with your written contract or invoice, this is the time to ask your contractor.

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Written Warranties
Ask Contra Costa County HVAC Contractors for Written Warranties and Care Instructions

Before your heating and cooling contractor leaves the job, confirm with them any warranties and guarantees you’ve agreed upon. Not all HVAC companies in Contra Costa County offer warranties on their work and products. But if the company you’ve chosen does, they should give you a written warranty that includes:

  • The HVAC contractor’s name and physical business address.
  • What heating and cooling products and work are covered, including whether the contractor will replace or repair your heating and cooling system or give you a refund if you place a warranty claim.
  • Your responsibility if you need warranty work or a replacement furnace or air conditioner (i.e., if you have to pay for labor when filing a claim for warranty work or pay a prorated amount).
  • Terms of and limitations on the new HVAC unit warranty.
  • If the new HVAC system warranty coverage is transferable to the new owner if you sell your home.
  • Any exclusions to the warranty must be in writing.

You should also ask for written care and handling instructions for your new air conditioner and furnace, including when to change air filters and how to handle service issues. Knowing what steps you should take to preserve your unit can help keep it running and efficient for years to come.

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Top 10 Requests
Top Service Requests Asked of Contra Costa County HVAC Contractors and Air Conditioner Repair Services

The most common air conditioning, heating and ventilation system repairs and services are listed below for your convenience. We’ve also included a list of the most popular brands of HVAC units available in Contra Costa County, including in the larger cities of Concord, Richmond, Antioch, Walnut Creek, Pittsburg, San Ramon, Danville, Brentwood, Martinez and Pleasant Hill and the greater Bay Area.

AC Repair (Air Conditioner Repair)
Contra Costa County HVAC contractors perform residential air conditioner repairs to fix broken AC units, replace failing air conditioner parts, upgrade air conditioners with new parts that are more energy efficient and prepare AC units for seasonal use.

Heater Repair (Furnace Repair)
As with home air conditioner repairs, home heater repairs upgrade old furnace parts, repair broken furnaces, replace failing heater parts and make old heaters more energy efficient for winter home heating. Heater repair technicians can also check for dangerous furnace emissions, such as carbon monoxide, and can fix any potential leaks.

Furnace Installation
New furnaces can be installed by local Contra Costa County heating and cooling companies. Furnace installers may put in stand-alone furnaces, or can install a new furnace as part of a home heating and cooling system. In order to get the best results and ensure the safety of your new home heater, furnace installation should only be done by an experienced professional.

HVAC Unit Installation
HVAC unit installation is a complicated process involving determining which size of heating and cooling equipment is needed, which brand and model of HVAC unit is best for your needs, detailed installation methods to keep air conditioner and furnace warrantees intact, and the actual installation process which must be done correctly in order to preserve the safety and integrity of the equipment. Experts recommend that HVAC equipment, including air conditioners, heaters, home ventilation systems, boiler systems and furnaces, should be installed by professional HVAC installation companies.

Heating and Air Conditioning Unit Repairs
Air conditioning and heating unit repairs include repairs to the heating and cooling elements, air intake, fans and* mechanical components of HVAC units.

Home Ventilation System Installation & Repair
Home ventilation system installation and repairs in Contra Costa County deal with the air intake vents, exhaust fans, home ventilator, air ducts and ventilation system controls. Some ventilation systems are integrated with heating and cooling systems while others are stand-alone ventilation systems. Residential ventilation systems remove stale air from the home, bring in fresh air from outside, and move the air around inside the home.

Energy Star HVAC Systems
Energy Star HVAC systems sold in Contra Costa County are heating and cooling units that are Energy Star certified. Energy Star is labeling system designed by the US Environmental Protection Agency and the US Department of Energy. Energy Star heating and cooling systems, air conditioners, furnaces, boilers and other home comfort systems are extensively tested to ensure high efficiency standards.

Portable Air Conditioning Units
Often seen as window air conditioners or compact air conditioners on wheels, portable air conditioning units are small, movable AC units that are not permanently installed and can be moved from room to room.

Central Air Conditioner Installation
Central air conditioners are cooling and dehumidifying systems that work from a central location in a home or business to distribute cool air throughout the building. Central air conditioners are often installed together with central heating furnaces and are known as HVAC units.

Residential Heating and Cooling System Installation
Contra Costa County HVAC companies offer installation of* residential heating and cooling systems. Installation generally includes removal of old HVAC equipment, installation and custom fitting of new heating and cooling components.

Top 10 Brand Requests for HVAC Equipment in Contra Costa County

  1. Trane Air Conditioning Units
  2. Carrier Furnaces & Air Conditioners
  3. Goodman Air Conditioners
  4. Air Con Systems
  5. Frigidaire Air Conditioners
  6. Mitsubishi Air Conditioners
  7. Bryant Furnaces
  8. Amana Air Conditioning & Heaters
  9. Lennox Air Conditioning & Furnaces
  10. Kenmore Air Conditioners & Heating Units
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Glossary Of Terms
Heating, Cooling and Ventilation Glossary of Terms

air conditioner
A piece of home cooling equipment that controls indoor air temperature, humidity, air quality, and movement of cool air. Air conditioning units can be portable air conditioners or central air conditioning systems that stand alone or are part of an integrated HVAC system.

Also known as: air conditioning, home air conditioner, residential air conditioner, air conditioning unit

air filter
An air filter is the device used to remove unwanted particles, dust, vapors, and odors from indoor air. Air filters have two functions: protecting home HVAC equipment from damage and improving indoor air quality.

Also known as: air filtration units, home air filters, air conditioner filters, furnace filters, HVAC filters

air handler
Heating and cooling systems have air handlers, the piece of equipment that forces hot and cool air through ductwork and out the air vents.

Also known as: air handling system, air fan, HVAC air handler

BTU rating
BTU stands for British Thermal Units. BTUs measure the amount of heat needed to raise one pound of water one degree Fahrenheit. The higher an HVAC system’s BTU rating, the larger the heating capacity of the air conditioner or furnace. Larger homes with more space to heat and cool require HVAC systems with higher BTU ratings.

Also known as: British Thermal Units, BTU ratings, heating capacity rating, cooling capacity rating

Home heating boilers heat air using steam and hot water. Some boilers may be more efficient at providing even, draft-free heat than forced-air heaters.

Also known as: hot water steam boiler, boiler system, low pressure boilers, high pressure boilers, steam boiler, hot water boiler, steam system, gas system, oil system, boiler furnace

Capacity is defined as the ability of a heating and cooling system to heat or cool a space. When measured, the cooling capacity of an air conditioning system is generally stated in tons while heating capacity of furnaces and home heaters are measured in BTUs.

Also known as: heating ability, air conditioning ability, cooling ability, HVAC unit capacity

carbon monoxide
Carbon monoxide is a colorless, odorless, toxic gas that is produced when carbon fuels are burned. Carbon monoxide, also commonly called CO2, can leak into a home or business when furnaces or HVAC equipment becomes worn, leaky or is not correctly maintained.

Also known as: CO, CO2

central air conditioning system
Systems that cool indoor air and dehumidify it in one central location and then deliver the cooler air via a system of ducts are known as central air conditioning systems.

Also known as: central air systems, central air conditioning units, central air conditioning

downflow furnace
Downflow furnaces take in cool air at the top of the furnace unit and blow warm air out the bottom of the unit.

Also known as: down flow furnace

Metal duct pipes that form a system of ducts throughout a home or building are referred to as ductwork. Ductwork is used to transfer and circulate air from a heating, cooling and ventilation system throughout the building.

Also known as: ducts, duct system, ductwork system, stainless steel ducts

Energy Star
Developed and trademarked by the US Department of Energy and the Environmental Protection Agency. Energy Star is a government-sponsored branding program that tests and labels energy efficient appliances and products.

Also known as: Energy Star rated HVAC units, Energy Star appliances, Energy Star heaters, Energy Star air conditioners, eco-friendly HVAC, Energy Star systems

forced air
Systems for heating, cooling and ventilation that use fans and blowers to move air through the HVAC system and into the home or business are known as forced air systems.

Also known as: forced air system, forced air HVAC system, forced air HVAC unit

Self-contained heating units that heat air in homes and buildings are referred to as furnaces. Furnaces may be stand-alone heaters or can be part of a heating, cooling and ventilation system. Some furnaces provide central heating by heating air in one central location and then dispersing it through ducts to heat an entire home while other heaters are portable furnaces.

Also known as: heaters, home furnace, heater unit, home heating unit, HVAC system, gas furnace, electric furnace, free-standing furnace, central heating unit

HVAC stands for heating, ventilation and air conditioning. It refers to air conditioning and heating systems in homes and other buildings. HVAC can also be used to describe the trade of installing, maintaining and servicing HVAC equipment.

Also known as: heating, cooling and ventilation; heating, cooling, ventilation; heating and cooling; heating and cooling systems; HVACR; heating, ventilation, air conditioning, refrigeration

heat pump
The heat pump is the unit that handles both heating and cooling. In some climates, a heat pump may handle your heating and cooling needs more efficiently than a furnace and air conditioner.

Also known as: heater pump, heating pump, home heat pump

horizontal flow furnace
Horizontal flow furnaces are installed on their sides, enabling them to draw in air from one side, heat the air and push it out the other side to heat the room.

Also known as: furnace, side furnace, horizontal furnace

heating seasonal performance factor
Heating seasonal performance factor measures the heating efficiency of heat pumps. The higher a heat pump’s HSPF, the more efficiently the heat pump works.

Also known as: HSPF

Humidifiers add moisture to the air. Stand alone humidifiers are portable and can be moved from room to room. Other humidifiers are available as permanent equipment additions to HVAC systems to add moisture to air as it comes out of the furnace to keep the air in a home or building from becoming too dry when the heater is running.

Also known as: home humidifier, air humidifier, humidifying system

load calculation
Load calculation is a way of computing the cooling and heating power an HVAC system must produce for indoor comfort. The load is influenced by many factors: climate, square footage of conditioned area, orientation and layout of the building, number of human occupants, room count and dimensions, window and door count and characteristics, insulation quantity and quality, and more.

Also known as: heat gain and loss calculation, heat loss calculation, heat gain calculation, load calculator, HVAC unit load calculation, heating & cooling load calculation, HVAC system load calculator

package system
An outdoor unit that houses heating and cooling blower and coil components, package systems provide heating and cooling for an entire building or home.

Also known as: packaged heat pump, package heat pump, packaged system, package air conditioner, packaged air conditioner, electric cooling package system, gas heating package system, electric heating package system

As used in an air conditioner or air conditioning component of an HVAC system, any chemical used to cool the air is referred to as refrigerant.

Also known as: air conditioning, home cooling, chemical refrigeration, refrigeration, chemical refrigerant

seasonal energy efficiency rating
SEER measures an air conditioner or HVAC unit’s cooling efficiency. The higher the SEER number, the greater the efficiency of the unit.

Also known as: SEER

A thermostat is a device that monitors and controls the temperature inside a home or building. Thermostats may be manually set or can be programmable thermostats that are pre-set to heat and cool buildings at a certain time.

Also known as: programmable thermostats, wireless thermostats, touch screen thermostats, home thermostats, HVAC thermostats, heating and cooling thermostats, digital thermostat, home  comfort control

upflow furnace
An upflow furnace draws cool air from the bottom of the unit and blows warmed air from the top.

Also known as: forced air furnace

ventilation system
Home ventilation systems exchange stale indoor air with to fresh air from outside the home. Ventilation systems often filter the incoming air. Ventilation components are often a standard part of home heating and cooling systems.

Also known as: home ventilators, HVAC system, home ventilation system

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Frequently Asked Questions
FAQ About Local Heating and Cooling Services

Q: Why choose a Diamond Certified HVAC company?
A: Diamond Certified helps you choose a local heating and cooling contractor with confidence by offering a list of top-rated local companies who have passed the country’s most in-depth rating process. Only furnace and air conditioning companies rated Highest in Quality earn the prestigious Diamond Certified award. Most companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with in-depth and ongoing research and ratings. And your purchase is backed by the Diamond Certified Performance Guarantee. So you’ll feel confident choosing a Diamond Certified heating and cooling company.

Q: How do I know when it’s time to replace my old HVAC equipment?
A: Only a thorough examination from a good heating and cooling contractor will tell you for sure if you need a new home comfort system, but there are a few tell-tale signs that it may be time to replace your HVAC unit:

  • If your furnace, boiler, heat pump, air conditioner or HVAC system is more than 10-15 years old, you may want to consider replacing it with a newer, more energy efficient system.
  • If your HVAC equipment needs frequent repairs, doesn’t seem to be heating and cooling your home as well as it used to, or your energy bills are going up.
  • Sudden humidity problems in your home may be a sign of a poorly-operating HVAC system or heating and cooling equipment failure.
  • Your HVAC system is very noisy when it runs or seems to be struggling to keep up with your heating and cooling needs. This could signal an undersized system or an underperforming HVAC unit.
  • Excessive dust can be a sign of leaky HVAC ducts.

Q: Some rooms in my house are too hot while others are too cold. What could be causing this?
A: Rooms that are too hot or too cold can be caused by duct work problems, poor home insulation, inefficient HVAC equipment or a failing heating and cooling system. You should call a qualified heating and cooling contractor for a home energy audit and a check of your HVAC system. A good HVAC contractor should be able to determine what is causing the temperature fluctuations and tell you the best way to fix the problem.

Q: How often should I have my home HVAC system serviced?
A: Most HVAC companies recommend having your heating and air conditioning equipment checked at least once a year. Some companies advise having a qualified HVAC technician test your heater/furnace in the fall and your air conditioning tested in the spring. HVAC servicing may help your system last longer and stay efficient because regular heating and cooling system maintenance can help locate problems and fix them before they cause an HVAC system failure, help your system run at peak performance and cut down energy costs, maintain healthy and safe operation, and can prolong the life of the furnace and air conditioner equipment.

Q: What features should I look for in a home heating and cooling system?
A: Home comfort systems come with many different features. Your heating and cooling specialist should help you determine which features are best for you, but you may want to spend some time thinking about what is important to you before selecting a home air conditioning unit and furnace. Some HVAC unit features you may wish to consider include home climate control devices such as programmable thermostats, HVAC system noise reduction units, cooling and heating units that preserve home air quality, and high efficiency equipment that helps save money and is better for the environment.

Q: Why should I consider an Energy Star furnace and air conditioner?
A: Energy Star HVAC systems are those that have tested as high efficiency in the Energy Star labeling system designed by the EPA and the US Department of Energy. Energy Star air conditioners, furnaces, boilers and HVAC units may offer better efficiency standards and lower operating costs and environmental costs than competing heating and cooling systems that are not Energy Star certified.

Q: How long will it take to replace my AC and furnace equipment?
A: The amount of time for installation depends on the size of your job, the work you’re having done and the experience level and detail of your heating and cooling contractor. It can take as few as one or two days to add on to an existing HVAC system and up to a week or more to install new furnaces and AC systems. Good contractors will take the necessary time to modify your new heating and cooling unit and ductwork to exactly fit your home.

Q: Do I really need to hire a local heating, cooling and ventilation contractor or can I just install my new HVAC system myself?
A: Poorly-installed HVAC systems can be more expensive to run, can wear out sooner than correctly-installed heating and cooling systems and can even pose a danger to your health. If HVAC systems are installed incorrectly, they can even leak toxic gasses into your home. So it’s important to hire a skilled, licensed HVAC contractor to install, service and inspect your home heating and cooling system. HVAC contractors who know how to do their jobs correctly will install systems without gaps in the ductwork, so systems are more efficient and last years longer than poorly-installed systems.

Q: What is the difference between an upflow furnace, downflow furnace and horizontal furnace?
A: These terms simply refer to how a furnace delivers air. An upflow furnace delivers hot or cold air upwards, pushing heated or air conditioned air up from the top of the furnace into an overhead HVAC duct system and then out through heater vents or air conditioning vents. A downflow furnace is the opposite, pushing air down through the bottom of the furnace and into the home duct system that runs beneath it. Horizontal furnaces, as the name suggests, lay on their side and push the cooled or heated air out into the ducts from a prone position. Horizontal furnaces are most often used in attics, basements or tight spaces because they maximize space.

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