Heat Pump Installation and Repair in Palo Alto, CA

A Homeowner’s Guide to Heat Pump Installation and Repair in Palo Alto

The instant heat pump permit

Palo Alto issues heat pump permits online, instantly, to contractors with a C-20 (HVAC) license. The Heat Pump Space Conditioning Systems Instant Permit covers new, retrofit and replacement systems at detached single-family homes, duplexes and ADUs, up to three systems per permit, including the furnace or air handler and the ducts. Its conditions:

• Sound rating under 65 dBA for each heat pump.
• No roof units, nothing between the home and the street, and nothing visible from the public right-of-way.
• Setback calculated by the permit from the unit’s sound level; inspectors measure it. Units within 10 feet of each other are added together as a cluster.
• Uploads before issuance: load calculation worksheet, equipment specifications, and a CF1R from a rater.
• Before the final: CF2R and CF3R forms, an SB 407 certificate of compliance and a smoke and CO alarm self-certification.

Keep the permit packet and uploads on site for the inspector. Projects outside these limits go through a Building Pre-Application.

Noise and setbacks in the Municipal Code

Since 2023, section 9.10.030 has given heat pumps and other electrification equipment a simple test: meet the sound level in Table 1 for your distance from the receiving property line. A few rows east of Foothill Expressway, where most homes are:

Rated sound level (standard unit)	Inverter unit	Minimum setback
53 dBA	55 dBA	3 ft
58 dBA	60 dBA	6 ft
63 dBA	65 dBA	10 ft
68 dBA	70 dBA	19 ft
73 dBA	75 dBA	34 ft

West of Foothill each limit is 10 dB lower. An owner may use the general rule instead, 6 dB above the local ambient at the property line, where that is more permissive. In R-1 zones, section 18.12.040 requires a 3-foot interior side and rear setback and a 10-foot street-side setback, keeps the equipment out of the front setback, and asks for it to be housed and insulated unless that would interfere with how it runs.

The 2027 rule for new air conditioners

Palo Alto adopted the 2025 Energy Code with local amendments in 2025 (Ordinance 5665). Section 16.17.140 applies to building permit applications submitted on or after January 1, 2027:

• A new or replacement AC on existing ducts must meet airflow and fan efficacy targets, refrigerant charge verification, R-49 attic insulation and ceiling air sealing, with exceptions for homes that already have R-38.
• A new or replacement heat pump meets the state’s charge and airflow checks, and any backup heat, electric strips or a gas furnace, must lock out above 35°F outdoors.
• Exceptions return an AC to the simpler rules when the panel can carry an AC but not a heat pump, or the heat pump would need to be 12,000 Btu/h or more larger. Load calculations are submitted before the permit.

State testing on a changeout

The Energy Commission’s 2025 guidance makes duct sealing part of any system alteration, even replacing only the indoor or outdoor unit: 10% total leakage or 7% to outside, or a smoke test of accessible leaks. Heat pumps get refrigerant charge verification in every climate zone, new systems need load calculations, and old refrigerant is recovered by an EPA 608 Type II or Universal technician. Since January 1, 2026, the state’s ECC Program has replaced the HERS program for this testing and HERS raters are recognized as ECC-Raters; the City’s permit page still says “HERS rater.” See duct repair.

CPAU rebates and the furnace rule

Palo Alto’s electricity and gas come from City of Palo Alto Utilities, so SVCE’s programs don’t apply. CPAU’s Rebate Hub pays for a heat pump that replaces a gas or fossil-fuel heater, with add-ons only alongside a core rebate: a panel up to 200 amps, new circuits, and the permit fee for a standalone heat pump HVAC permit. A heat pump that heats both the house and the water qualifies for both rebates, applied for separately. TECH Clean California’s single-family heat pump incentives have been fully reserved since November 14, 2025. See Palo Alto Utilities rebates.

The Bay Area Air District’s Rule 9-4 sets a zero-NOx standard for furnaces manufactured after January 1, 2029. For CPAU’s water, gas and sewer rules, see plumbing in Palo Alto.

Sources

City of Palo Alto: Heat Pump Space Conditioning Systems Instant Permit · Rebate Hub · Green Building Code Requirements · Proposed 2026–2028 Green Building and Local Energy Code Update. Palo Alto Municipal Code: § 9.10.030 and Table 1 · § 18.12.040 · § 16.17.140. California Energy Commission: 2025 Single-Family HVAC · Energy Code Compliance Program. Bay Area Air District: Building Appliances Rule Implementation. TECH Clean California incentives. Checked October 2026.