Los Angeles has thousands of licensed heating and air conditioning contractors and a steady supply of unlicensed ones. The difference between them almost never shows up in the advertising. It shows up on the invoice, or two summers later when equipment that should have lasted fifteen years quits at nine.
Most homeowners choose on price and star rating. Both are worth checking, and both are the easiest things on the list to manipulate. What separates a good contractor from an expensive mistake is visible before anyone touches your system: what they are willing to verify, what they measure, and what they will put in writing.
The checks below are ordered by how much money they save you.
Start with the licence, and verify it yourself
In California, heating and air conditioning work requires a C-20 contractor licence issued by the Contractors State License Board. You can check any licence in under a minute at cslb.ca.gov using either the company name or the licence number.
Three things on that record matter. The licence should read active, not expired or suspended. The classification should be C-20, because a general B licence describes a contractor who subcontracts the HVAC work instead of performing it. And the bond and workers compensation status should both be current.
California also requires contractors to display their licence number in advertising, which is why you see it on trucks and websites. A company advertising HVAC work with no licence number anywhere has told you something before you call.
Insurance is not a formality
If an uninsured worker is injured in your attic, the exposure can land on your homeowners policy. If an uninsured crew puts a foot through your ceiling or damages a roof jack, you are the one arguing about who pays.
Ask for a certificate of insurance. A verbal yes is worth nothing once something has gone wrong. General liability covers damage to your property. Workers compensation covers the crew. The licence record shows whether workers compensation is on file, but the liability certificate has to come from the contractor.
Ask who pulls the permit before you ask about price
Most Los Angeles jurisdictions require a permit for an air conditioner or furnace changeout. On top of the permit, California’s Title 24 energy code requires independent third party HERS verification of the finished work, typically covering refrigerant charge and duct leakage.
A contractor who offers to skip the permit is offering to save you a few hundred dollars and hand you two problems instead. Unpermitted work surfaces during your next home sale, and without the HERS inspection nobody has independently confirmed the system performs the way it was sold to you.
Both the permit and the HERS verification belong on the written proposal as line items. If they are missing from a quote for a new system, ask why before you compare that quote to anything else.
How to read reviews without being fooled
A flawless five star average across forty reviews tells you less than a 4.7 across four hundred. Volume and spread carry more information than the number itself.
Read the three star reviews first. They are usually the honest ones, and they describe what happened instead of how someone felt about it. Look for detail. A review that names the part, the technician, or how long the repair took was written by a customer. A review that says great service, highly recommend was written by anyone.
Then look at how the company answers its worst reviews. A specific reply that addresses the actual complaint is worth more than a polite template repeated under every one star.
Check at least two platforms, since Google, Yelp and the Better Business Bureau collect different customers. You can see our own reviews here, and the same test applies to them.
Ask what they are going to measure
This is the question that separates contractors, and almost nobody asks it.
Diagnosing an air conditioner properly means taking readings, not looking at the unit and forming an opinion. A technician should be able to tell you the refrigerant pressures and the saturation temperatures they correspond to, the superheat and subcooling, the temperature difference between the return air and the supply air, the amperage the compressor and fan motor are drawing against what the data plate allows, and the static pressure across the air handler.
Those numbers are what turn a symptom into a diagnosis. Ask for them in writing after any AC repair visit. A contractor who took the readings will hand them over without hesitating.
For a replacement quote, the equivalent question is whether they will perform a load calculation on your house instead of copying the tonnage of whatever is sitting there now. The existing unit may well have been the wrong size for the last fifteen years, and copying it forward repeats the mistake at full price.
Get three written quotes, then compare the right lines
Verbal estimates are neither comparable nor enforceable. A written proposal should name the equipment model numbers, the refrigerant, the warranty terms on parts and on labour separately, the permit, the HERS verification, and what happens to the old equipment.
Compare those lines before you compare totals. Two quotes separated by two thousand dollars usually differ in scope, not in margin, and the cheaper one is often missing the ductwork, the permit, or correctly sized equipment.
California also limits what a contractor can collect up front on a home improvement contract. The down payment cannot exceed one thousand dollars or ten percent of the contract price, whichever is less. Anyone asking for half the job in advance is operating outside that rule, which tells you how they treat the rest of the rules.
What a price that is far too low usually means
Someone has to absorb the gap, and it is rarely the contractor. The savings normally come from one of these:
The permit and the HERS verification were left out of the scope.
The installing crew is unlicensed or uninsured, whatever the licence on the paperwork says.
The outdoor unit and the indoor coil are not a matched pair, which costs efficiency and can void the warranty.
No load calculation was performed, so the size is a guess.
A refrigerant leak is being topped off every season instead of found and repaired.
The warranty exists in conversation only.
Questions worth asking before you book
What is your CSLB licence number, and is the crew employed by you or subcontracted?
Is the diagnostic fee credited against the repair if I go ahead?
Do evenings, weekends or holidays carry a different rate?
Will I get the measured readings in writing, not just the conclusion?
Who pulls the permit and schedules the HERS inspection?
What is covered on labour, for how long, and what voids it?
Signs to walk away
The recommendation is replacement before anyone has diagnosed the failure.
The quote is verbal, or the written version has one line and one number.
The price drops sharply the moment you hesitate.
The offer expires today.
You are asked for a large deposit in cash.
Straight answers about licensing, insurance or permits are hard to get.
Common questions
How do I check if an HVAC contractor is licensed in California?
Search the company name or licence number at cslb.ca.gov. Confirm the licence is active, the classification is C-20, and the bond and workers compensation are current. The search is free and takes about a minute.
How many quotes should I get for an AC replacement?
Three is enough to see the range without stalling the project. Compare scope line by line rather than comparing totals, since the cheapest quote is often the one missing the permit, the ductwork, or a load calculation.
Should I hire the cheapest HVAC company?
Only if the scope matches the others. A quote well below the rest usually reflects work that was left out rather than efficiency, and the missing items tend to be the permit, the correct equipment match, or licensed labour.
Does an HVAC contractor need a permit in Los Angeles?
Yes. Most jurisdictions require a permit for an air conditioner or furnace changeout, and California’s Title 24 code adds independent HERS verification of the completed work. A reputable contractor pulls the permit as part of the job and lists it on the proposal.
What should an HVAC company do before quoting a new system?
Perform a load calculation on your house, look at the ductwork and the return, and put the equipment model numbers, refrigerant, warranty, permit and HERS verification in a written proposal. Quoting from the tonnage of the old unit alone is guesswork.
Want a second opinion on a quote you already have
If someone has recommended a replacement and you are not sure the diagnosis supports it, a second look costs you nothing and occasionally saves several thousand dollars. It is also worth reading how the repair and replacement decision actually works before you sign anything.
Cool Breeze LA is licensed and insured, puts the readings and the estimate in writing before work starts, and pulls the permit as part of the job. We serve Los Angeles, Calabasas, Sherman Oaks, Glendale, Pasadena and Burbank. Call (310) 469-1979 or book a visit online.