Top Rated Hvac Contractors Serving Forest Knolls, CA

If you really care about choosing a quality hvac contractor, we’re here for you. Here’s your access to the best hvac contractors serving Forest Knolls including 94933. These heating and air conditioning experts provide energy-efficient HVAC and indoor air quality, and they also work on thermostat installation, AC tune ups and HVAC upgrades. For 22 years we’ve conducted the most accurate ratings and deepest research of local contractors, so you’ll be confident in choosing.

  • Last Updated May 15, 2026
  • 148,521 people sourced companies in Heating & Air Conditioning
    16,331 Verified Heating & Air Conditioning Customers Surveyed
16,331
148,521
1 of 5
Kelly Plumbing & Heating, Inc. installs the latest technology in forced air furnaces, heat pumps and air conditioning systems for residents of Marin C...
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Main Services

Heating & Air Conditioning
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Additional Services

Central Heat Pump Systems, Forced Air Heating & Air Conditioning, Radiant Heat Boilers & Installations, Tankless & High Efficiency Water Heaters, Attic Fans, Air Duct Cleaning, Dryer Vent Cleaning, Duct Insulation, Heat Pump Water Heaters

Brands

Bradford White, Honeywell, Mitsubishi, Navien, Rinnai, Trane, Triangle Tube

Coverage Areas

Marin County, Sonoma County

Family Owned
Family Owned
Residential Only
Residential Only
Appointments Available
Appointments Available
Live Phone Call Answers
Live Phone Call Answers
861 Sweetser Avenue, Novato, CA 94945
Hours CLOSED NOW
License:
688049
2 of 5
Enviro Heating & Air Conditioning, Inc. installs, repairs, and maintains all types of HVAC equipment for residential and commercial clients in Sonoma,...
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Main Services

Heating & Air Conditioning
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Air Duct Cleaning
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Additional Services

Air Duct Cleaning, HVAC Repair, Installation & Maintenance, Sheet Metal Fabrication

Coverage Areas

Sonoma County, Marin County, Napa County

Emergency 24/7
Emergency 24/7
Residential & Commercial
Residential & Commercial
Appointments Available
Appointments Available
Live Phone Call Answers
Live Phone Call Answers
  • Quick Connect
Hours CLOSED NOW
License:
928565
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Moore Home Services specializes in the installation of energy-efficient replacement systems. The company services, repairs, and installs all types and...
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Main Services

Heating & Air Conditioning
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Plumbing

Additional Services

Residential Air Conditioning and Heating, Including Maintenance, Repair and Equipment Replacement; Ductwork; Zoning; Air Filtration; Indoor Air Quality System Installation; Insulation; ThermaShield Radiant Barrier Installation; Water Heaters; Tankless Water Heaters; Water Filtration Systems; Water Conditioning Systems; Plumbing Maintenance, Repair and Replacement; Sewer Replacement; Drain Clearing; Hydro Jetting Services

Coverage Areas

Sonoma County, Marin County, Napa County

Hours CLOSED NOW
License:
1051850
4 of 5
Hassler Heating & Air Conditioning, LLC is leading the way in California’s electrification efforts, providing comprehensive HVAC services that include...
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Main Services

Heating & Air Conditioning
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Home Energy Auditor
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Additional Services

Central Ducted Heat Pump, Ductless Mini-Split Heat Pump, Water Heater (Standard, Tankless, Heat Pump, Electric Resistance), Furnace, and A/C Installations and Repairs, Home Energy Assessments and Home Energy Score (HES) Assessments, Energy Upgrade Measures (Building Shell)

Brands

Bosch, Carrier, Mitsubishi, Navien

Coverage Areas

Alameda County, Contra Costa County, Marin County

Family Owned
Family Owned
Established in 1999
Established in 1999
Residential & Commercial
Residential & Commercial
Financing Available
Financing Available
  • Quick Connect
Hours CLOSED NOW
License:
770180
5 of 5
Ongaro & Sons provides a complete range of plumbing services for residential and commercial clients in Sonoma and Marin Counties. In addition to servi...
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Main Services

Electrical Contractor
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Plumbing
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Heating & Air Conditioning
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Additional Services

Plumbing, Heating & Cooling Service, Electrical Service, Repair & Installation, Indoor Air Quality, Water Heater Repair & Replacement, Sewer Cleaning & Replacement

Brands

American Standard, Trane, Mitsubishi

Coverage Areas

Sonoma County, Marin County

Family Owned
Family Owned
Established in 1932
Established in 1932
Residential & Commercial
Residential & Commercial
Mobile Services Available
Mobile Services Available
  • Quick Connect
Hours CLOSED NOW
License:
215233
Learn how to choose a Heating & Air Conditioning and more…

Diamond Certified Hvac Contractors Serve These Forest Knolls ZIP Codes

94933

Diamond Certified Hvac Contractors In Forest Knolls

Diamond Certified hvac contractors serving Forest Knolls are rated an average of 4.6 out of 5 stars based on 1768 reviews of 77 rated hvac contractors.
Diamond Certified hvac contractors in Forest Knolls Avg. Star Rating.

We make you an expert at choosing a high-quality HVAC contractor in the Forest Knolls area.

For those who love quality local HVAC contractors.

Within our Diamond Certified Resource:

You’ll love and refer your friends and family to your new Forest Knolls area Diamond Certified HVAC contractor. They provide expert services, including HVAC maintenance plans, HVAC ductwork, air filtration, ventilation systems, energy-efficient HVAC work, and more.

To qualify for Diamond Certified, each contractor must score Highest in Quality and Helpful Expertise (a 90+ on a 100 scale) and pass all our credential-based ratings. Diamond Certified HVAC contractors that serve Forest Knolls residents include Kelly Plumbing & Heating, Inc., Ongaro & Sons, and Enviro Heating & Air Conditioning, Inc..

Every Diamond Certified HVAC contractor that serves residents in 94933 performs various specialties, including HVAC troubleshooting, thermostat installation, indoor air quality, HVAC repairs, and cooling system installations.

How to Choose a Quality Forest Knolls Hvac Contractor for Your Family
  1. Click the name of the contractor to get to their Diamond Certified Company Report page.
  2. Watch their Diamond Certified Video Profile and other videos that we’ve created for you.
  3. Read their verbatim client survey responses and our researched articles.
  4. Get helpful heating and air conditioning tips if they are a Diamond Certified Expert Contributor.
  5. Call or email them to schedule an appointment.
Become a Diamond Certified Preferred Member and Join Your Forest Knolls Neighbors

If you love quality local contractors, this is for you. Become a Diamond Certified Preferred Member (always free) and get a double performance guarantee, extra guides and tips, our annual Diamond Certified Directory, and more.

Your Diamond Certified Resource. We make you an expert at choosing.

We make you an expert at choosing local companies by giving you the most accurate ratings, deeply researched company reports and Diamond Certified Guide of all Resource Guides, which cover 70+ industries in the Auto, Home, Health and Personal service categories. Each guide contains 16 key articles that are separated into “Before, During and After the Job” tabs. These are written to guide you through each phase of hiring, starting, managing and ending a job in that specific type of service.

Diamond Certified Resource Compared to Crowd-Sourced Review Sites

Diamond Certified Resource’s ratings of local companies are based on surveys of only verified real customers, so they are the most accurate. This beats crowd-sourced review sites like Yelp, Angi or even Google that are plagued with fake, manipulated, cherry-picked and non-customer reviews, which produce inaccurate and often inflated rating scores.

Diamond Certified Resource’s deeply researched reports of top rated Diamond Certified companies include everything you need to see to be very confident in choosing a top rated local company. Each company report includes detailed quality ratings and scoring, verbatim customer survey responses, a profile video, a company story video, a capabilities table, a photo gallery, researched articles, unique expert contributions from the company’s owner, and more. This beats crowd-sourced review sites that solicit companies to “claim their business listing” and add any type of info to their profiles. This sounds good, but it has led to company profiles that are littered with false claims and incomplete info.

Map of Forest Knolls, CA

Forest Knolls was founded in 1959, and today, your 3,726 neighbors enjoy crabbing, arcades, corn mazes, farm tours and mountaineering. Forest Knollsians use Diamond Certified HVAC contractors for heating, HVAC installation, heating system installations, air filtration, heat pump repair, and more.

Frequently Asked Questions for Heating & Air Conditioning in Forest Knolls, CA
Q: What are clients of Diamond Certified hvac contractors saying about contractors in Forest Knolls, CA?
A: Verified Kelly Plumbing & Heating, Inc. Customer, 1 of 429
"I would recommend Jim Kelly. He's professional, competent, and an expert in the heating and air world. I find them to be reliable, timely, professional, and accommodating. I've never had any sort of issue with anything they've done for me." - Emily K.
All Survey Responses for Kelly Plumbing & Heating, Inc.
Verified Enviro Heating & Air Conditioning, Inc. Customer, 1 of 199
"I like that they are local. It's a husband and wife who work together and the wife takes care of everything, answers the phone and distributes the workers. The husband fixed a furnace a couple of years ago and coaches little league, which is a plus. He stopped on his way home on the weekend and fixed it when no one else would. I'm going to be a lifelong customer as long as they are in business. They are a local, family run business and they explain to me everything that they are doing. If they adjust the jets, they tell me, show me everything and let me watch." - David M.
All Survey Responses for Enviro Heating & Air Conditioning, Inc.
Verified Moore Home Services Customer, 1 of 450
"They were reasonably priced and they helped me get a new furnace right after my husband passed away. I was very happy with the manager who came and set it up. They were very timely. Their service and price were very reasonable." - Julie C.
All Survey Responses for Moore Home Services
Verified Hassler Heating & Air Conditioning, LLC Customer, 1 of 313
"They are amazing. I needed work done within a certain time frame, and they were able to get someone on the jobsite and completed the work within the time frame that I had. I liked that they were efficient, the staff and their service." - Jasmine S.
All Survey Responses for Hassler Heating & Air Conditioning, LLC
Verified Ongaro & Sons Customer, 1 of 305
"I'd highly recommend them. There was someone here in the area that I used for years, but he retired. So when I needed some help after that, I looked around, randomly picked them, and I've been very happy ever since. They're always here on time. Everything was very good and very matter of fact. What they said they were going to do, they did." - Lisa F.
All Survey Responses for Ongaro & Sons
Q: What are some of the most popular brands that Diamond Certified hvac contractors use when working with Forest Knolls residents?
A: Diamond Certified hvac contractors use top-quality brands like Trane, Johnson Controls, LG Electronics, York and Lennox.
Q: What types of heat pump repair do hvac contractors offer?
A: HVAC contractors typically offer a wide range of heat pump repair services, including diagnosing and repairing issues with the thermostat, compressor, fan motor, outdoor fan, ductwork, refrigerant lines, and the reversing valve. They can also repair or replace the condenser, evaporator, and expansion valves. Additionally, they can inspect the system for leaks and make sure the refrigerant charge is correct. Finally, they can clean and calibrate the system to ensure optimal performance.
Q: Can Diamond Certified hvac contractors work with Carrier products and similar items so I can get energy-efficient HVAC in Forest Knolls?
A: Yes, Diamond Certified hvac contractors can work with Carrier products and similar items to help you get energy-efficient HVAC in Forest Knolls.
Q: What did people search for when they wanted to find the best quality hvac contractors in Forest Knolls?
A: Heating
Air Conditioning
Ac Tune Ups
Heat Pump Repair
Furnace Repair
The Homeowner's Guide to Heating, Cooling & Air Quality