Furnace vs. Heat Pump for the Mild Bay Climate
In a climate that rarely gets truly cold, a heat pump can do the whole job — heating and cooling — often more efficiently than a gas furnace. Here's the honest comparison.
- Author
- By Cabrillo Plumbing, Heating & Air
- Last updated
- Updated June 2026
- Reading time
- 4 min read
A gas furnace makes heat by burning fuel; a heat pump moves heat and runs on electricity, and it cools in summer too. The Bay Area's mild winters are close to ideal for heat pumps, which lose efficiency only in the sustained deep cold we rarely see. A furnace can still make sense if you have very low-cost gas, existing ducts in good shape, and no interest in cooling. But for most local homes — especially those electrifying or adding cooling — a heat pump is the more flexible, efficient long-term choice, and it opens the door to rebates.
What to know
- A heat pump heats and cools; a furnace only heats.
- Our mild winters play to a heat pump's strengths — deep-cold efficiency loss is rarely a factor here.
- Existing good ducts and cheap gas can still favor a furnace for some homes.
- Heat pumps unlock efficiency rebates that gas equipment generally doesn't.
Full guide coming soon
This is the short version. A deeper, fully-cited guide for San Francisco & Peninsula homeowners is on the way. Need an answer now? Ask our team or call (415) 843-2900.
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