Heat Pump Installation in San Francisco Houses and Flats

The work

Heat pump projects that suit how the city was built

Replacing the furnace in a Sunset garage level
On a Sunset or Parkside tract house the living floor sits over the garage, and the furnace and its ducts are often down there with the car. A ducted heat pump can reuse that layout with an air handler on the garage level. The outdoor unit is the puzzle: with no side yard, the usual choices are the back of the lot or the roof, and either spot has to stay within the city's noise limit at the neighbor's property line.
Ductless heads for flats in a divided Victorian
A Victorian split into two or three flats rarely has room for new ducts, so each unit tends to get its own ductless system, with indoor heads in the main rooms and refrigerant lines run up a light well or the rear wall. In a rental, the size is not a matter of taste: the Housing Code expects permanent heat able to hold 70°F in every habitable room, and every heater has to be permanently attached and wired under the San Francisco Electrical Code.
Adding cooling to a sunny top floor
The health department notes that emergency visits and deaths in San Francisco begin to rise around 85°F, and that the city's homes are largely unprepared for heat. Top-floor flats and attic rooms on the sun belt side of town are where that bites. A heat pump replacing an old furnace or wall heater brings cooling with it, which is often the first air conditioning those rooms have ever had.

The Golden Gate Bridge and San Francisco, seen from the Marin Headlands. Photo: Paul.h, Public domain, via Wikimedia Commons.

The houses here

Fog belt, sun belt and the rooms in between

The city's Better Streets plan divides San Francisco into three climate zones: a coastal fog belt of cool temperatures, dense summer fog and westerly winds; a transition zone of light fog and moderate temperatures; and a bay-side sun belt that is warm, dry, clear and sunny. A heat pump in the Outer Sunset therefore works as a heater most of the year, while one on Bernal Heights may also be asked to cool a top-floor bedroom on a hot afternoon. The buildings set their own limits. Sunset tract houses stand wall to wall on 25-foot lots with no side yards, and many Victorians and Edwardians are divided into flats, each needing its own heat and somewhere to put an outdoor unit.

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Permits and local rules

City codes a heat pump has to satisfy

Police Code noise limits for fixed equipment
Article 29 of the Police Code, as rewritten in 2008, defines a fixed source to include pumps, fans, air-conditioning apparatus and refrigeration machines. On residential property such a machine may not make noise more than 5 dBA above the ambient at any point outside the property plane, and in a multi-unit building not more than 5 dBA above the local ambient inside another unit with its windows closed. Inside any bedroom or living room the limit is 45 dBA from 10 p.m. to 7 a.m. and 55 dBA during the day, measured with windows open.
San Francisco Board of Supervisors (opens in a new tab)
Minimum heat in a rental unit
In every residential rental unit except a hotel room, the San Francisco Housing Code requires a permanent heating source capable of keeping 70°F at a point 3 feet above the floor in all habitable rooms, not counting bathrooms and hallways. If the tenant does not control the heat, the landlord must provide it 24 hours a day. Portable space heaters do not satisfy the rule, and a tenant whose landlord falls short can call a building inspector and petition the Rent Board.
San Francisco Rent Board (opens in a new tab)
The all-electric rule for major renovations
Since July 1, 2026, a San Francisco project must be all-electric when it is both a major renovation, meaning a significant structural or non-structural alteration or an addition that counts as a substantial improvement, and a major upgrade to heating or hot water, such as replacing both systems for the whole building. The rule comes from Ordinance 174-25 and Administrative Bulletin 112. The building department lists exemptions, including technical infeasibility and appliances regulated by the US Department of Energy, gas models among them, which state energy and Air District rules still govern.
San Francisco Department of Building Inspection (opens in a new tab)

State license for this work: C-20 Warm-Air Heating, Ventilating and Air-Conditioning, C-4 Boiler, Hot Water Heating and Steam Fitting, C-10 Electrical. Look up a contractor's license on the CSLB website (opens in a new tab).

Before you hire

Questions that sort out heat pump bids

Ask where the outdoor unit will sit and how its sound rating compares with the 5 dBA limit at your neighbor's property line.
For a rental, ask the installer to show the system can hold 70°F in every habitable room, not only the living room.
If the heat pump is part of a larger remodel, ask whether the project counts as a major renovation under the all-electric rule.
On a top-floor flat on the sunny side of town, ask how the system was sized for cooling as well as heating.
For refrigerant lines run up a light well or a shared wall, ask what the condominium or neighbors must agree to first.

Questions

Heat pump questions from San Francisco owners

Is cooling worth paying for in a San Francisco house?

It depends on where the house is. The fog belt on the west side stays cool through summer, while the bay-side sun belt is warmer and sunnier. The Department of Public Health reports that San Francisco has the lowest rate of air conditioning ownership in the country and that health impacts start rising around 85°F, so a top-floor room on the sunny side is where cooling earns its keep.

Can the outdoor unit go in the narrow gap between my house and my neighbor's?

Only if it stays within the Police Code. A fixed machine on residential property may not raise noise more than 5 dBA above ambient at any point outside the property line, and it may not push noise inside a neighbor's bedroom above 45 dBA at night with the windows open. A unit inches from a neighbor's window often fails that test, which is why the rear yard or roof is usually the better spot.

I rent out a flat. Can I replace its old wall heater with portable heaters?

No. The Rent Board's guidance on the Housing Code says portable space heaters do not meet the heating requirement. The unit needs a permanent heating source able to hold 70°F three feet above the floor in all habitable rooms, and heaters must be permanently attached and properly wired. A heat pump sized for every room satisfies that.

Does replacing my gas furnace make my whole house go electric?

Not by itself. San Francisco's all-electric rule for existing buildings applies to a major renovation, which needs both a substantial mechanical upgrade and a substantial alteration or addition. Swapping one furnace for another or for a heat pump is neither. The Air District's own furnace rule is separate and applies when equipment is replaced, so ask the installer about both.

Which climate zone is San Francisco for the Energy Code?

Zone 3. Every San Francisco ZIP code on the California Energy Commission's climate zone list is assigned to zone 3, the mild coastal zone, so the energy rules for a heat pump changeout are the same in the Outer Sunset as in the Mission, even though the summers feel very different.

Keep exploring

More on heat pump and HVAC work and San Francisco

Heating, cooling and heat pumps in other cities

Heating, cooling and heat pumps in San Jose

Other trades in San Francisco

Guides and smaller jobs

Where this page belongs

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

Heat pumps for San Francisco's fog belt, flats and rentals

Heat pump projects that suit how the city was built

Replacing the furnace in a Sunset garage level

Ductless heads for flats in a divided Victorian

Adding cooling to a sunny top floor