Heating, cooling and heat pumps Daly City

Heat pumps and furnaces in Daly City's fog-belt tracts

Heating is what a system here gets bought for: the city's four ZIP codes, 94014 through 94017, all fall in Energy Code climate zone 3, and the findings behind the local building code describe persistent fog, high humidity and salt-laden ocean wind. A furnace changeout is a quick permit. The outdoor half of a heat pump is the harder part, because from ten at night the test is whether it can be heard past the property line.

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  • Rules on this page checked against 18 public sources, October 2026

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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Before you hire

Settle these before the equipment is ordered

  1. Ask where the outdoor unit will stand in a three-foot side yard, and whether it can be heard across the line after ten at night.
  2. If a bigger service is part of it, ask whether the new panel and meter go on an exterior wall, and whether the clear working space stays on your parcel.
  3. Ask whether the permit goes in through the city's portal under the contractor's own C-20 license, which you can look up at cslb.ca.gov.
  4. Check that the contractor holds a current Daly City business license, which the city requires for work performed inside the city.
  5. If duct in the garage or crawlspace is wrapped in cloth or chalky insulation, ask for it to be tested before anyone cuts into it.
Furnace changeout
A quick permit, issued over the counter or in the portal
Night noise test
10 p.m. to 6 a.m.: audible past the line, no decibel table
Mechanical code
2025 CMC adopted with no local amendment (Ch. 15.16)
Energy Code zone
Climate zone 3, ZIP codes 94014 through 94017
A technician servicing the outdoor unit of a heat pump
A technician servicing the outdoor unit of a heat pump. Photo: U.S. Air Force 102IW by Senior Airman Julia Ahaesy, Public domain, via Wikimedia Commons.

The houses here

Three-foot side yards, and the furnace at garage level

West of Interstate 280 this is tract housing from the 1950s and 60s, and the shape that repeats puts the living floor above a two-car garage, which is where the furnace, its flue and the duct trunk usually sit. Short duct runs and easy access come with that, and so does working around a parked car. Outside there is almost nothing to work with: the Building Division's own handout puts the typical side-yard setback for a house here at exactly three feet. The findings the city filed with its building code describe the air those three feet hold, a coastal marine climate of persistent fog and high humidity, with seasonal wind carrying salt off the Pacific that wears at exterior materials. An outdoor unit, its pad and its line set all live in it.

Free, no obligation. Next, add your details in the request form.

The work

Four calls, and what each one runs into here

  1. A furnace swapped where the old one stood

    The city handles this as a building maintenance permit and lists furnace replacement among the projects it can issue over the counter without plan review, beside re-roofs, siding, windows, water heaters and service upgrades. The same type can be filed in the city's online permit portal instead. Two things catch out-of-town crews. A contractor needs a current Daly City business license to perform work inside the city, and inspections are booked with the Building Division at least two business days ahead, so the rough mechanical inspection for ductwork, which comes before walls and ceilings close, is not an afternoon phone call.

  2. Finding somewhere the outdoor unit can stand

    With three feet to the line and a house that often fills the width between the setbacks, a heat pump's outdoor unit ends up in the rear yard, at the front of the garage, or on a bracket off a wall. Each spot is then judged by ear rather than by a table. Section 9.22.030 asks only whether noise can be heard beyond the property between ten at night and six in the morning, which is a stiffer test where the background is quiet: the Noise Element measured 50 to 55 dBA in the Serramonte area between departures out of the airport, with flyovers spiking far above that for a few seconds.

  3. Service, meter and disconnect before the equipment

    A gas furnace needs current only for its blower and controls. A heat pump with backup heat needs considerably more, and in a house built around gas heat the panel is where a changeout stalls. Daly City amended the electrical code so the main service disconnect and the utility meters go on the exterior of the building, in spaces readily accessible for reading and maintenance. The working-clearance handout explains why so many side-yard panels here are recessed into the wall: the three-foot clear space in front of the gear has to lie entirely on your own parcel and may not reach across the line.

  4. Exhaust fans for the rooms under the house

    Finishing the lower floor, or making it an accessory unit, drags the ventilation side of this work into a fire-rated assembly. The Building Division's guidance for designers says a bath fan cannot sit in the one-hour floor-ceiling separation between a unit below and the dwelling above, because no fan is listed as part of a tested one-hour assembly and a field-built gypsum box is not accepted in its place. It asks for the fan in a soffit or dropped ceiling under the rated lid, or exhausted through an exterior wall outside the separation, with the duct kept within the unit. The city's CalGreen checklist then wants a humidity control adjustable between 50 and 80 percent relative humidity unless the fan serves a whole-house system.

Permits and local rules

What the code actually says about this work

  • Section 9.22.030, and the absence of a decibel limit

    The city's noise rule sits in Chapter 9.22 of the Municipal Code and is three sections long. Section 9.22.030 provides that between ten p.m. and six a.m. no person shall cause, create or permit any noise, music, sound or other disturbance upon his property which may be heard by, or which disturbs or harasses, any other person beyond the confines of the property it comes from. No decibel table is attached to it, and nothing in the chapter carves out mechanical equipment. For a heat pump expected to run on a cold night, that leaves one practical question: can it be heard across the line.

    Daly City Municipal Code 9.22.030 (opens in a new tab)

  • Chapter 15.16 takes the mechanical code as written

    Ordinance No. 1484, adopted November 24, 2025, repealed the former mechanical chapter and enacted a new one. Chapter 15.16 adopts the California Mechanical Code, 2025 Edition, as published by the International Association of Plumbing and Mechanical Officials, effective January 1, 2026, with applications deemed complete before that date allowed to proceed under the code in force when they were filed. What the chapter does not contain is a single local amendment, and Chapter 15.60 does the same for the Energy Code. The building and residential chapters each carry a dozen amended sections, so the local rules an HVAC crew meets come from elsewhere in Title 15 rather than from the mechanical code.

    Daly City Municipal Code, Chapter 15.16 (opens in a new tab)

  • The amendment a heat pump upgrade does meet

    Chapter 15.24 adopts the 2025 California Electrical Code and then rewrites Article 230.70(A)(1). Under the local text the main service disconnecting means and the associated utility meters must be located in spaces readily accessible for examination, reading, replacement or necessary maintenance, and electrical meters and disconnecting means are generally to be installed on the exterior of the building. That is the clause a bigger service for a heat pump has to satisfy, and the reason the equipment usually ends up on an outside wall rather than tucked into the garage where the old panel may have been.

    Daly City Municipal Code 15.24.020 (opens in a new tab)

  • The gas furnace limit comes from the Air District

    Nothing in the city's adopted codes pushes a house off gas heat. The standard that reaches a replacement is Rule 9-4, which applies to anyone who sells, installs or offers a gas furnace for sale in the Bay Area Air District and sets a zero-NOx limit for units manufactured after January 1, 2029. It works at the point of purchase: a working furnace is not ordered out, and the limit lands on whatever goes in next. In a city where the furnace runs and the air conditioner mostly never existed, that date is the one thing likely to change what a changeout looks like.

    Source: Bay Area Air District (baaqmd.gov)

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 (cslb.ca.gov).

Timing

Salt air, and the clocks around a changeout

The calendar here looks nothing like the valleys two ridges inland. The city's code findings record persistent fog, high humidity and seasonal wind carrying ocean salt, and that is the air an outdoor coil, a cabinet, a disconnect and a flue cap sit in all year, which shows up first at fasteners and fins on the ocean side of town. Two clocks matter on the job itself: a quick permit can be issued at the counter or in the portal, but the Building Division wants two business days' notice for each inspection, and a gas unit quoted as a replacement is worth checking for its manufacture date.

Free, no obligation. Next, add your details in the request form.

Questions

Heating and cooling questions asked here

Does replacing a furnace in Daly City need a permit?

Yes, and it is one of the quicker ones. Furnace replacement is on the city's list of projects that can be permitted over the counter without plan review, and it can also be filed in the online permit portal. It counts as a building maintenance permit, the same category as roofs, siding, windows, water heaters and electrical service upgrades. Whoever pulls it needs a Daly City business license, and the inspection is scheduled with the Building Division two business days out.

Our neighbor can hear the heat pump at night. What rule applies?

Section 9.22.030 of the Municipal Code. Between ten at night and six in the morning it bars any noise or other disturbance on your property that may be heard by, or that disturbs or harasses, anyone beyond the confines of that property. There is no decibel figure in the chapter and no exception for machinery, so the argument is about audibility rather than a reading. Moving the unit, a sound blanket from the maker, or holding back the compressor overnight are the usual answers.

Will the city make us put in a heat pump instead of a new gas furnace?

No. Chapter 15.16 adopts the state mechanical code as published and Chapter 15.60 does the same with the Energy Code, neither with a local amendment about equipment type. The limit on gas furnaces is the Air District's, applying to units manufactured after January 1, 2029 and biting when a furnace is replaced. On the incentive side, WestLight Energy, formerly Peninsula Clean Energy and the community electricity provider for San Mateo County, lists rebates for heat pump HVAC systems; confirm the current terms before equipment is ordered.

Where does the electrical panel go if the heat pump needs a bigger service?

Outside. Daly City's amendment to the electrical code puts the main service disconnect and the utility meters in readily accessible spaces and generally on the exterior of the building. The side yard is the usual place and it is only about three feet wide, which is why the city's working-clearance handout notes that panels there were recessed into the wall: the required clear space in front of the gear must sit entirely on your own property and cannot extend onto your neighbor's.

We are adding a bathroom in the rooms downstairs. Can the fan go up through the ceiling?

Not through a rated one. Where the lower unit is separated from the dwelling above by a one-hour floor-ceiling assembly, the Building Division's guidance says no bath fan is listed as part of a tested one-hour assembly and a gypsum box built in the field does not replace one. The fan belongs in a soffit or dropped ceiling below the rated lid, or exhausted through an exterior wall that is not part of the separation, with its duct kept inside the unit.

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.

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