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.

Heating, cooling and heat pumps San Jose

Heat pumps in San Jose: quiet enough at the line, sized for valley summers

In San Jose the outdoor half of a heat pump draws as much attention as the indoor half. The city lets a compressor sit three to five feet from a property line only if it is quiet enough, and holds every outdoor heat pump to 55 dBA at the line. Indoors, the city's electrification plan creates no mandate to pull out a working gas furnace, though the Air District's rule reaches replacement furnaces made after 2029.

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Compressor setback
3 to 5 ft from the property line, with a noise table
Noise limit
55 dBA at the property line
Title 24 climate zone
Zone 4, like Santa Clara and Sunnyvale
Wood heat allowed
Pellet, EPA-certified, or listed gas in a masonry fireplace

The work

Four HVAC jobs the city's checklist spells out

  • A heat pump where the old condenser stood

    San Jose allows an outdoor heat pump compressor between three and five feet from the property line, with a three-foot clear path kept between the equipment and any fence. Within five feet of the line, the unit's published sound rating has to fall under the city's Table A, which sets different limits for inverter and single-speed models. Where a spec sheet lists only sound power, the city subtracts seven to get sound pressure. Check the numbers before the unit is ordered.

  • Ductless mini-splits for slab houses and additions

    The city's heating page says a ductless mini-split generally takes three permits: mechanical for the refrigerant lines, indoor heads and outdoor condenser; electrical for the dedicated 240-volt circuit and the disconnect; and building for mounting the indoor units and sealing and flashing the wall or roof penetration where the line set enters. The inspector also expects a load calculation showing the panel can carry the new load, and firestopping at wall penetrations.

  • Replacing a gas furnace

    A furnace replacement in San Jose usually takes mechanical, electrical and building permits, all from one application on SJPermits.org. The city's checklist calls for a gas shutoff within six feet of the unit, a 30-by-30-inch workspace, seismic anchorage, and plastic vent pipe primed in a contrasting color. A furnace moved into the attic needs a structural evaluation, and one in a garage must be raised above the floor. A heat pump's online permit covers mechanical and electrical together.

  • Fireplaces, inserts and wood stoves

    Under City Ordinance 21633, a wood-burning appliance in San Jose must be a pellet heater, a wood heater certified by the EPA, or a listed gas appliance in a masonry fireplace. A newly installed gas fireplace must be direct-vent, sealed-combustion. A remodel above the city's cost threshold that comes within 12 inches of an old wood-burning fireplace, measured on the plane of its wall, triggers that standard, and wood-burning work cannot be permitted online.

Hotel Valencia at Santana Row in San Jose
Hotel Valencia at Santana Row in San Jose. Photo: Payton Chung, CC BY 2.0, via Wikimedia Commons.

The houses here

Radiant slabs, planned developments and side-yard condensers

Heating in San Jose ranges from hot-water pipes cast into concrete to rooftop and side-yard equipment. The National Register nomination for the Fairglen Additions in Willow Glen describes slab-on-grade foundations with radiant heating, and with low, flat roofs whose deck is the ceiling, an Eichler has no attic to hide ducts in, so replacing a failed slab system means choosing between ductless heads and a new route for ducts. The city also notes that in planned developments, heat pumps commonly replace air conditioning condensers that were originally approved less than five feet from the property line, and its heat pump noise table applies to those spots too.

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Get quotes for heat pump and HVAC work in San Jose

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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.

Permits and local rules

San Jose and Air District rules behind an HVAC quote

  • Noise and setbacks for outdoor equipment

    San Jose's heating and cooling page sets the rules for a heat pump installed outside: 55 dBA of sound pressure at the property line, a compressor placed between three and five feet from the line, and a three-foot clear path to fences. Table A applies to equipment closer than five feet and to planned developments where heat pumps replace condensers approved that close. The inspector also wants the manufacturer's instructions and a signed smoke and CO alarm affidavit.

    City of San José, Air Conditioning, Heating & Fireplaces (opens in a new tab)

  • Rule 9-4 applies at burnout, not before

    The Bay Area Air District's 2023 amendments set zero-NOx standards for small water and space heating equipment, with dates in 2027, 2029 and 2031 depending on size and type; residential furnaces fall under Rule 9-4 and the 2029 date. The Air District says the requirements apply only when existing equipment burns out and cover equipment manufactured after the new date. A second phase of its implementation working group is reviewing the furnace rule.

    Bay Area Air District, Building Appliances (opens in a new tab)

  • Electrification without a mandate

    Climate Smart San José names building electrification a focus, and the city says energy use in buildings makes up about a third of its greenhouse gas emissions. Its framework for existing buildings encourages and incentivizes the switch to electric appliances but, in the city's words, does not create any mandates to switch out existing natural gas for electric equipment. A working gas furnace can stay until the owner decides otherwise.

    City of San José, Building Electrification (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).

Timing

Plan the changeout before the first hot week

Heat in San Jose comes in runs. The National Weather Service put the city under an Excessive Heat Warning from July 2 to July 6, 2024, and the city opened cooling centers for the week. An air conditioner that fails in a stretch like that leaves no time to compare a heat pump's noise rating with Table A or to run a load calculation on the panel. Planning the swap in spring or fall leaves room for both, and for the online permit.

Before you hire

Three checks and a license lookup for an HVAC bid

  • Ask for the outdoor unit's sound rating and how it compares with San Jose's Table A at the distance from your property line.
  • For a mini-split, ask whether the price includes the building permit for mounting and flashing the line-set penetration.
  • Ask for the electrical load calculation the inspector expects, and whether the panel needs work first.
  • Look up the C-20 license at cslb.ca.gov, plus C-10 if the same company is running the new circuit.

Questions

Asked about heat pumps, furnaces and fireplaces here

How close to my neighbor's fence can a heat pump go in San Jose?

The compressor can sit between three and five feet from the property line, but there must be a three-foot clear path between the equipment and the fence. Closer than five feet, the unit's published sound level has to meet the city's Table A, and an outdoor heat pump must keep sound pressure at the property line to 55 dBA.

Does San Jose make me replace my gas furnace with a heat pump?

No. The city's framework for existing building electrification encourages the switch but creates no mandate to replace existing gas equipment. Separately, the Air District's Rule 9-4 sets a zero-NOx standard for furnaces manufactured after its 2029 date, and it applies only when a furnace burns out and is replaced.

Our Eichler's radiant floor heat stopped working. What are the options?

Eichlers in San Jose's Fairglen Additions were built with radiant heating in the concrete slab, and with no attic above, ducts are hard to add. The choice is between repairing the slab system and an alternative such as ductless heat pump heads, which San Jose permits with mechanical, electrical and building permits. In the Fairglen Additions historic district, exterior changes that need a Planning permit with historic review also fall under the city's Eichler design standards.

Can I replace an old wood-burning fireplace with a wood stove in San Jose?

Only with an approved type. City Ordinance 21633 limits wood-burning appliances to pellet heaters, wood heaters certified by the EPA, and listed gas appliances in masonry fireplaces. Installing one needs a building permit with plan review, since San Jose does not issue online permits for wood-burning appliances.

Does a window air conditioner need a permit in San Jose?

No. The city says plug-in window air conditioners, portable fans and heaters, and electric logs do not need a permit, though some plug-in equipment has to be on a dedicated circuit. Any new outlet or circuit for it does need an electrical permit.

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 pump and HVAC work in San Jose? Tell us what you see.

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