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MENLO PARK — If you’re planning to replace your furnace, there’s a chance you may need to replace your air ducts as well. Due to a recent Title 24 mandate, Bay Area residents planning for furnace replacements are now required to have their ductwork tested for energy efficiency using what’s known as a HERS (Home Energy Rating System) test. If the test determines your ducts have more than 15 percent leakage—which is highly likely in homes more than 30 years old—they’ll need to be replaced in conjunction with the furnace.
Duct replacement is expensive initially, especially if asbestos removal is needed, but once the new ducts are installed, they provide several benefits. For one, your home’s indoor air quality will improve significantly, since the new ducts won’t be pushing old dust and debris into your home’s airflow. Also, by eliminating air leaks, your utility bills will likely decrease by 20 to 30 percent, saving you money over the long run. Additionally, a duct replacement will allow your HVAC technician to perform modifications and improve the airflow to certain areas of your home.