How to Choose an HVAC Contractor in San Diego
By the Superior Air team · CSLB #669421 · Updated September 8, 2026
Key points
The short answer
Choose an HVAC contractor the way you would choose anyone doing a $10,000 to $30,000 job on your house: verify the license and insurance at the source, insist on a written proposal that names the equipment and the scope, ask a few specific questions, and walk away from anyone who will not pull a permit, will not run a load calculation, or wants a signature today. Everything below is detail on those four steps. The order matters; the license check comes first because nothing else on the list means anything if the contractor is not licensed.
Step one: check the license at cslb.ca.gov
The Contractors State License Board licenses every contractor in California, and its license check at cslb.ca.gov is public and free. Search by the license number printed on the contractor's proposal, truck or website, or by the business name. Every legitimate contractor in the state must display the license number on advertising, so if you cannot find a number, that is your first answer.
The record tells you several things. Read all of them.
Classification: what C-20 means
California licenses contractors by trade. The classification for HVAC work is C-20, Warm-Air Heating, Ventilating and Air-Conditioning. It is the license required to install, replace and repair heating and air-conditioning systems. A contractor holding only a general building license (B), or only an electrical (C-10) or plumbing (C-36) license, is not licensed for HVAC as a specialty. Some contractors hold more than one classification. A C-10 alongside the C-20, for example, means the electrical work for a heat pump or a panel upgrade can be done under the same license instead of subcontracted. Superior Air Inc holds CSLB license #669421 with C-20 and C-10 classifications, issued in 1993.
Status: active, and under the right name
The record shows whether the license is active, expired, suspended or revoked, and the business name and entity it was issued to. Confirm that the name matches the proposal. A common problem is a proposal from one business name while the license belongs to a different entity or an individual who is no longer involved. It also shows the qualifying individual, the person whose experience the license rests on.
Bond and workers' compensation
Every California contractor must carry a contractor's bond, currently $25,000, which gives you some recourse if the work is defective or abandoned. The record shows the bond and the surety. It also shows workers' compensation coverage. This one matters more than most homeowners realize: if an uninsured worker is hurt in your attic, the claim can land on your homeowner's policy. A contractor with employees and no workers' comp on file is either misreporting or exempt as a sole owner with no employees, and either way you should ask who exactly will be on the roof. The record also lists any disciplinary actions and complaints resolved by the board.
What the license check does not tell you
A clean CSLB record means the contractor is legally permitted to do the work and is bonded and insured. It does not tell you whether they size systems properly, seal ducts, or charge refrigerant by weight. That is what the proposal and the questions are for.
Step two: why permits matter
Every jurisdiction in San Diego County, the City of San Diego, Chula Vista, Escondido, Carlsbad, El Cajon, Poway, La Mesa, Santee and the unincorporated county among them, requires a mechanical permit for a heating or air-conditioning changeout. California's Title 24 energy code additionally requires duct leakage and refrigerant charge verification on most residential changeouts, carried out by an independent third-party verifier. Since January 1, 2026 that verification has run under the California Energy Commission's Energy Code Compliance program, formerly known as HERS testing.
A contractor who suggests skipping the permit is offering to save you a few hundred dollars now and hand you three problems later. An unpermitted system can surface at resale during disclosure and inspection. Some insurers and manufacturers treat unpermitted work as grounds to deny a claim. And the inspection is your independent check that the disconnect, the condensate drain, the clearances and the gas connection were done right. The contractor should pull the permit in the business's name, not ask you to pull an owner-builder permit for work they are doing. Our San Diego permit guide covers what to expect in each jurisdiction.
Step three: what a real proposal includes
The proposal is where contractors separate. A serious one is a specification, not a price on a business card. It should state each of the following in writing.
| Factor | What it should state | Why it matters |
|---|---|---|
| Equipment | Brand, model number and capacity for the outdoor unit, the indoor coil, and the furnace or air handler | Without model numbers you cannot verify the ratings, the warranty or that the pieces are a matched system |
| Ratings | SEER2 and EER2 for the matched pair; HSPF2 for heat pumps; AFUE for furnaces | A rating not certified for the pair is a marketing number. Current federal minimums in California are 14.3 SEER2 for most split ACs |
| Sizing | That a Manual J load calculation was performed, and the capacity it supports | Copying the old tonnage is the most common sizing mistake and produces oversized, short-cycling systems |
| Ductwork | Whether ducts are tested, sealed, modified or replaced, and what happens if the leakage test fails | The energy code requires the test on most changeouts; new equipment on leaking ducts will not perform |
| Refrigerant and line set | Refrigerant type (R-454B or R-32 on new equipment), and whether the line set is replaced or flushed | New A2L refrigerants cannot share an old R-410A coil; old oil residue damages new equipment |
| Electrical | Disconnect, whip, breaker size, and any panel work, itemized | The most common source of change orders after signing |
| Permit and testing | Permit fee and who pulls it; third-party energy-code verification named | Required in every San Diego jurisdiction |
| Warranty | Manufacturer parts and compressor terms, registration, and any labor coverage, in writing | Verbal warranties do not exist after the truck leaves |
| Scope and schedule | What is removed, what is installed, haul-away, expected duration, and payment terms | California limits the down payment on a home improvement contract to $1,000 or 10 percent, whichever is less |
Two contractors quoting the same house will differ on some of these lines, and that is the point: the difference in price is usually a difference in scope. A quote that is thousands lower and silent on ducts, permit and testing is not a bargain. It is a smaller job. The AC replacement cost guide explains what each of these lines does to the number.
Step four: questions to ask
Ask these of every contractor, and write down the answers. They are not trick questions; a competent contractor will be glad you asked.
- How will you size the system? The answer should include a load calculation, ideally Manual J, on the house as it is now. "Same as what you have" is the wrong answer. Our sizing guide explains why.
- Will you test the ducts, and what happens if they fail? The energy code requires the test on most changeouts. Ask whether sealing is included, what the threshold is, and what a redesign would cost if the ducts are undersized.
- Who pulls the permit and schedules the inspection? The answer should be the contractor, under their license.
- What refrigerant does the new equipment use, and is the line set being replaced? New equipment from 2025 uses R-454B or R-32; the answer tells you whether the contractor is current.
- How do you charge the system? By weight, with a deep vacuum on the line set first, then verified under the energy code. Not by "feel" or by sight glass.
- Who exactly is doing the work? Employees or subcontractors, and whether the workers' comp on the CSLB record covers them.
- What is the warranty, and who registers it? Manufacturer parts and compressor terms vary with registration; ask who files it and get the terms in writing.
- What are the options? A contractor who offers one system at one price has decided for you. Ask to see a mid-tier and a high-tier configuration, and for a heat pump alongside an AC-and-furnace pair where it makes sense. The heat pump versus AC and furnace guide explains when it does.
Red flags
These are the patterns that predict a bad job. Any one of them is a reason to slow down; two are a reason to stop.
- No permit, or "you don't really need one." You do. Every San Diego jurisdiction requires it.
- A price over the phone. A number given without seeing the home cannot account for the load, the ducts, the panel or the access. It is a guess or a hook.
- No load calculation. "Same size as the old one" carries forward whatever mistake was made in 1978.
- Pressure. A discount that expires tonight, a "manager's special," or a signature required before the technician leaves. A proposal that is good today is good on Thursday.
- No model numbers. "A 3-ton 16 SEER system" is not equipment; it is a category. Ask for the numbers.
- Cash discounts for skipping paperwork. The paperwork is the permit and the contract that protect you.
- A license number that does not check out, is expired, belongs to a different business name, or is missing from the truck and the proposal.
- Condemning the system on sight. A technician who declares the unit dead without measuring the charge, pressures or amperage is selling, not diagnosing. Our repair-or-replace guide lists what a real assessment measures.
- Refrigerant top-offs with no leak search. Refrigerant is not consumed. A system that needs more has a leak.
Comparing quotes on the same footing
When the proposals are in, lay them side by side against the table above. Cross out any that fail the license check or omit the permit. For the rest, adjust for scope: if one includes duct sealing and the other does not, that is a real difference in what you are buying, not a difference in price. Confirm the equipment is a certified matched pair at the stated SEER2. Then compare warranties, schedule and the answers to the questions. The lowest complete quote from a licensed contractor with a load calculation is a reasonable choice. The lowest quote, full stop, usually is not.
How Superior Air approaches this
We would rather be compared than trusted on faith, so here is what you will see from us and what you can check.
- License you can verify. CSLB #669421, C-20 and C-10, active since 1993, bonded and with workers' compensation on file. Look it up at cslb.ca.gov before we come out.
- An evaluation before a number. We do not price by phone. A technician measures the home, inspects the ducts, coil, electrical and drain, and runs a Manual J load calculation.
- Written options. Two or three configurations with model numbers, certified ratings, the duct and electrical scope, the permit, the energy-code testing and the warranty terms. Where it fits the home, a heat pump option sits alongside the AC-and-furnace option.
- When the job needs a permit, we can pull it and coordinate the inspection under our license, and schedule the third-party energy-code verification where it applies.
- Refrigerant by weight, ducts tested, old equipment recovered and hauled away. These are on the proposal, not in the fine print.
The full sequence from first visit to final inspection is in our replacement process guide, and the AC replacement page covers what the job includes. If you have questions the FAQ does not answer, or you are ready for written options, schedule a consultation.