Local · 7 Min Read

San Diego HVAC Permits: What's Required When You Replace a System

Permit and energy-code testing requirements for HVAC changeouts in the City and County of San Diego, and who is responsible for them.

By the Superior Air team · CSLB #669421 · Updated September 8, 2026

Key points

Replacing an AC, furnace, heat pump or air handler requires a mechanical permit everywhere in San Diego County: the City of San Diego, every other incorporated city, and the unincorporated areas served by the County.
The contractor pulls the permit. A licensed contractor who asks you to pull it, or says one is not needed, is shifting the liability to you.
Most changeouts also need third-party field verification of duct leakage and refrigerant charge under California's Title 24 energy code, administered since January 1, 2026 under the Energy Commission's Energy Code Compliance program, formerly HERS testing.
Skipping the permit saves little and risks a lot: no inspection, problems at sale or with insurance, and an installation that never had to prove it met the energy code.

The short answer

Yes, you need a permit. Replacing heating or cooling equipment requires a mechanical permit in the City of San Diego and in every other jurisdiction in San Diego County, including the unincorporated communities that fall under the County's Planning & Development Services. That applies to a like-for-like condenser swap as much as to a full system replacement or a heat pump conversion. The contractor pulls the permit, the work is inspected after installation, and on many changeouts an independent verifier also has to test the ducts and the refrigerant charge under California's energy code before the permit is finaled.

None of this is optional, and none of it should be a surprise on the invoice. A proposal from a licensed contractor should list the permit and the verification as line items.

Which jurisdictions require a permit

All of them. The differences are in who issues it and how the process runs.

Where HVAC changeout permits are issued in San Diego County.
Factor	Permitting authority	What to know
City of San Diego	Development Services Department	Covers the city proper, from Otay Mesa to Rancho Bernardo, including Mira Mesa, Clairemont, Scripps Ranch, Carmel Valley, Point Loma and Pacific Beach. Permits are filed online and inspections are scheduled after installation
Unincorporated county	County of San Diego Planning & Development Services	Ramona, Lakeside, Spring Valley, Alpine, Fallbrook, Valley Center, Bonita and the other unincorporated communities. Permits and inspections run through the County's Accela portal
Other incorporated cities	Each city's own building division	Chula Vista, El Cajon, La Mesa, Santee, Poway, Escondido, San Marcos, Carlsbad, Encinitas, Oceanside, Vista, National City, Coronado and the rest each issue their own mechanical permits with their own fee schedules and inspection scheduling

The practical consequence is that a contractor working across the county deals with a dozen or more permitting offices, each with its own portal, forms and inspection calendar. That is part of what you are paying a licensed contractor for. If you are not sure which jurisdiction your address falls in (a Poway mailing address, for instance, can be in the City of Poway or in unincorporated county), the County's parcel lookup settles it.

Who pulls the permit and what it covers

The contractor pulls the permit under their own license. That is how it should be. A licensed C-20 contractor is accountable for the work passing inspection, and the permit record ties the installation to the company that did it. Owner-builder permits exist for homeowners doing their own work; a contractor who asks you to pull one for work they are performing is putting their liability on you, and it is a reliable warning sign.

A mechanical permit for a changeout covers the replacement of the heating and cooling equipment: the condenser or heat pump, the furnace or air handler, and the coil. Depending on the jurisdiction and the job, the same permit or a companion permit also covers:

Electrical work. A new circuit or disconnect for the outdoor unit, a 240-volt circuit for a heat pump air handler, or a panel upgrade.
Gas work. Reconnecting and leak-testing a gas line to a new furnace, or capping it when a furnace is removed for a heat pump.
Ductwork. Replacing or extending ducts is usually part of the mechanical scope.

When a job needs a permit, we file it after you accept a written option and before installation is scheduled. Our replacement process guide shows where it fits in the sequence.

Energy-code verification: Title 24 and the ECC program

California's Building Energy Efficiency Standards, Title 24 Part 6, apply to HVAC changeouts as well as new construction. On many replacements the code requires field verification by an independent third party of two things: that the duct system does not leak beyond an allowed percentage of the system airflow, and that the refrigerant charge is correct. Both are tested at the house with calibrated equipment, and the results are filed with the state registry.

For years this was called HERS testing, and the person doing it was a HERS rater. As of January 1, 2026 the verification is administered under the California Energy Commission's Energy Code Compliance program, so newer paperwork says ECC verification. The substance is the same: an independent verifier, not the installing contractor, confirms the installation meets the code.

Which tests apply depends on the climate zone and on what was replaced. Inland Climate Zone 10 homes in Escondido, Poway, El Cajon and Santee are subject to the requirements more often than coastal Climate Zone 7 homes, and replacing the coil or air handler triggers different requirements than replacing a furnace alone. Two things follow for the homeowner. First, the duct test is where old attic duct systems in 1970s tract homes get found out: ducts leaking 25 percent into the attic will not pass, and sealing or replacing them becomes part of the job. Second, the verification is a check on the contractor's work, which is why we welcome it. A system that passes a refrigerant charge verification is a system that was charged by weight and commissioned properly. The ductwork page explains what the duct test involves and what happens when ducts fail it.

The verification and the permit are separate. The verifier's certificate is part of what the building inspector expects to see, so the sequence is installation, verification, inspection.

The inspection: what the inspector looks at

After installation, the city or county inspector visits the house. The inspection is a check that the work matches the permit and meets the mechanical, electrical, plumbing and building codes. On a typical changeout the inspector looks at:

The equipment model numbers against the permit and the energy-code compliance forms.
Clearances around the outdoor unit and the indoor equipment, and the working space at the electrical panel.
The electrical disconnect within sight of the outdoor unit, the circuit sizing and the wiring method.
The condensate drain, including the secondary drain or float switch that stops the system if the primary drain clogs.
On a furnace, the flue connection and termination, combustion air, the gas shutoff and sediment trap, and the gas line test.
On attic installations, the access, the platform and the light and receptacle the code requires.
Refrigerant line insulation and the line set penetration through the wall.
Smoke alarms and carbon monoxide alarms. A California building permit for work above a modest value typically requires the home to have working alarms in the required locations, so inspectors routinely verify them on an HVAC permit.

If everything passes, the permit is finaled and the record closes. If the inspector flags a correction, the contractor fixes it and schedules a re-inspection. Either way, someone needs to provide access on the inspection day, and the contractor normally meets the inspector.

What happens without a permit

Unpermitted HVAC work is common enough that it is worth being plain about the consequences.

No inspection. Nobody independent checks the gas connection, the flue, the electrical circuit or the condensate drain. The problems that come from those, carbon monoxide, electrical faults, water damage from a clogged drain, are the ones a homeowner cannot see.
No energy-code verification. The ducts are never tested and the charge is never verified. The system may run at a fraction of its rated efficiency for its whole life and nobody will know.
Problems at sale. California sellers disclose known unpermitted work. Buyers and their inspectors look at the equipment date and ask for the permit. Missing permits become a negotiation, a price reduction, or a condition of sale to obtain one after the fact.
Insurance. A claim arising from unpermitted work, a fire at an undersized circuit or water damage from a drain, can be complicated by the fact that the work was never inspected.
Enforcement. Jurisdictions can require after-the-fact permits, corrections, and in some cases penalties.

The saving is the permit fee and the verification fee, which together are a small share of the job. A contractor who offers to skip them is offering to move the risk from their company to your house.

Fees and timing

Permit fees vary by jurisdiction, by the scope of the permit and by the fee schedule in force that year, so we do not quote figures here. The verification is billed by the independent verifier and also varies. Both are listed as line items on a Superior Air proposal for your address.

On timing, most jurisdictions issue a straightforward residential mechanical permit quickly, and some issue them online within a day of a complete application. Inspections are scheduled after installation and depend on the inspector's calendar. The verification is scheduled separately with the verifier. We coordinate all three, and we build them into the timeline you see when the written options are presented rather than promising a fixed number of days. The AC replacement cost guide explains where the permit and testing sit in the overall price.

How Superior Air approaches this

We don't price the job as if the permit were negotiable. When a job needs a permit, it's in the proposal as a line item, not an afterthought.
When a job needs a permit, we can pull it. It's filed under Superior Air's license after you accept a written option.
Verification is expected, not dreaded. We charge by weight, measure airflow and commission the system so that the third-party verification confirms what we already recorded.
We can coordinate the inspection. Where one is scheduled, we meet the inspector where needed and handle any correction before the job is closed.
You get the paperwork. On jobs with a permit, the finaled permit, the verification certificate and the commissioning readings go to you for your records and for resale.

For the service itself, see the AC replacement page or the heat pump installation page. To get started, schedule a consultation.

Do I need a permit to replace just the outdoor AC unit?

Yes. A mechanical permit is required for replacing heating or cooling equipment in every San Diego County jurisdiction, and the outdoor condenser is the equipment. A condenser changeout also replaces the indoor coil on new refrigerants, and it triggers the energy-code verification requirements in most climate zones, so it is treated the same as a full system replacement for permit purposes.

Who pulls the permit, me or the contractor?

The contractor. A licensed C-20 contractor pulls the permit under their own license and is responsible for the work passing inspection. If a contractor asks you to pull an owner-builder permit for work they are doing, or tells you a permit is not needed for a like-for-like swap, they are shifting the liability to you. When a job needs a permit, Superior Air can pull it and coordinate the inspection.

How to choose an HVAC contractor →

How much does an HVAC permit cost in San Diego?

It varies by jurisdiction and by what the permit covers, and the fee schedules change, so we do not quote a figure here. The permit fee and the third-party verification fee are listed as line items on our written proposal for your address, so you see them before you decide.

What is HERS testing, and is it still required?

HERS testing was the industry name for the third-party field verification California's energy code requires on many HVAC changeouts, covering duct leakage and refrigerant charge. The requirement still exists. Since January 1, 2026 it has been administered under the California Energy Commission's Energy Code Compliance program, so you may see it called ECC verification on newer paperwork. An independent verifier still comes to the house and files the results with the state.

My previous AC was replaced without a permit. What should I do?

It depends on the jurisdiction and how long ago it was done. Some allow a permit to be obtained after the fact with an inspection of the existing installation; others require corrections first. If you are replacing the system now, the new permit and inspection cover the new installation, and we can tell you during the evaluation whether anything from the old job would need to be corrected to pass.