A U.S. Department of Energy Building America report found that standard air-source heat pumps lose heating capacity faster below about 30°F. East Bay winters stay well above that on average. If you are considering heat pump installation, here is what the federal climate and energy data show.
Why Climate Matters for Heat Pump Efficiency
Heat pumps move heat rather than generating it. The City of Berkeley’s BESO guide says that by transferring rather than directly generating heat, heat pumps are much more efficient than gas furnaces and electric-resistance systems.
The Department of Energy report found that standard air-source heat pumps more rapidly lose heating capacity as the outdoor temperature drops below about 30°F and rely increasingly on supplemental heat.
What the East Bay Climate Actually Looks Like
At NOAA’s Berkeley weather station, average daily lows are 42°F in January and 43°F in December; at its Oakland Museum station they are 44°F and 45°F (1981–2010 normals). Those averages sit well above the roughly 30°F point in the Department of Energy report.
Cooling Needs
Cooling needs are small at the East Bay’s NOAA stations: Berkeley averages 174 cooling degree days a year, Richmond 190, and Oakland Museum 243, against 2,363 to 2,701 heating degree days.
The BAAQMD 2029 Zero-NOx Rule
Starting in 2029, only zero-NOx furnaces can be sold or installed in the Bay Area, and currently the only zero-NOx appliances available are electric. The rule applies to new appliances only and does not require replacing a working furnace. A gas furnace installed before 2029 is legal and can run its service life.
This does not make a gas furnace the wrong choice for every situation — see our heat pumps vs. gas furnace comparison for an honest breakdown of when each makes sense.
Where a Heat Pump Fits in the East Bay
A few situations where a heat pump fits:
- Homes that need both heating and cooling — one system replaces both your furnace and your central AC
- Homes with no ductwork — a ductless mini-split heat pump installs without ductwork and handles both heating and cooling
Current Incentives
The federal Section 25C tax credit covered improvements made through December 31, 2025, so it does not apply to systems installed in 2026. MCE lists a heat pump rebate of up to $400 per 500 square feet in communities it serves, and the City of Albany and City of Piedmont have heat pump rebates for income-qualified households. See our HVAC rebates page for a full breakdown of what is active and what has ended.
Frequently Asked Questions
Do heat pumps work well in Bay Area winters?
Average winter lows at NOAA’s Berkeley and Oakland Museum stations are 42–45°F (1981–2010 normals). A U.S. Department of Energy Building America report found that standard air-source heat pumps lose heating capacity faster as the outdoor temperature drops below about 30°F.
How much cooling do East Bay homes need?
Cooling needs are small at the East Bay’s NOAA stations: Berkeley averages 174 cooling degree days a year, Richmond 190, and Oakland Museum 243, against 2,363 to 2,701 heating degree days.
How efficient is a heat pump in Bay Area temperatures?
The City of Berkeley’s BESO guide says that by transferring rather than directly generating heat, heat pumps are much more efficient than gas furnaces and electric-resistance systems. What that means for your bills depends on your PG&E electricity and gas rates and how you use the home.
What is the BAAQMD 2029 zero-NOx rule, and does it affect my decision?
Starting in 2029, only zero-NOx furnaces can be sold or installed in the Bay Area, and currently the only zero-NOx appliances available are electric. The rule applies to new appliances only and does not require replacing a working furnace. A gas furnace installed before 2029 is legal and can run its service life.
Are there rebates available for heat pump installation in the East Bay?
The federal Section 25C tax credit covered improvements made through December 31, 2025, so it does not apply to systems installed in 2026. MCE lists a heat pump rebate of up to $400 per 500 square feet in communities it serves, and the City of Albany and City of Piedmont have heat pump rebates for income-qualified households. Our rebates page has a full breakdown by program and county.
Which heat pump brands does Aarvaks install in the East Bay?
Aarvaks installs Carrier, Bosch, and Mitsubishi heat pumps. System selection depends on your home’s duct configuration, square footage, and heating and cooling load. Aarvaks is a Carrier Authorized Dealer. All installations include a 10-year limited parts warranty and 3-year labor warranty.
Get a Heat Pump Estimate for Your East Bay Home
Aarvaks installs Carrier, Bosch, and Mitsubishi heat pumps throughout Berkeley and the East Bay. Written estimate before any work begins. Founded 1929.
Nearly a Century of East Bay HVAC Service
Aarvaks has been in Berkeley since 1929. Owner Jason Hanson built his career at one of the East Bay’s most respected HVAC companies before acquiring Aarvaks in 2025, bringing his top technicians with him. Aarvaks was recently named the top HVAC company in the East Bay by Bay Area Service Hub. All installations include a 10-year limited parts warranty and 3-year labor warranty.
97
Years serving
Berkeley and the East Bay
4.9★
Average Google rating
BBB Accredited
10yr
Limited parts warranty
3yr labor, 5yr with maintenance plan