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Questions to ask before you hire an HVAC contractor in Los Angeles

An air conditioner that quits during a September heat wave in the Valley, a 30-year-old furnace in a Craftsman bungalow, or a decision about switching to a heat pump — Los Angeles HVAC jobs come with their own wrinkles. California’s Contractors State License Board (CSLB) licensing, Title 24 energy-code testing, LADBS or local permits, wildfire smoke, and a patchwork of utility rebates all affect what a good quote should look like. Use these questions to compare LA-area HVAC contractors on verified credentials, real sizing, and a written scope — not just who can come out today.

Questions to ask

1. Are you licensed with the California Contractors State License Board (CSLB) for HVAC work, and can I see the license number?

Why it matters: In California, heating and air-conditioning contractors generally need an active CSLB license in a classification that covers the work — commonly the C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification. Ask for the exact license number and check status, classification, bond, workers’ compensation, and any complaint history on the CSLB website before anyone quotes you equipment. Also ask for a current liability insurance certificate. A business license or a slick truck wrap is not the same thing as a verified contractor license.

2. Which technicians on my job hold EPA Section 608 certification, and are they trained on the newer A2L refrigerants?

Why it matters: Anyone who opens a refrigerant circuit needs EPA Section 608 certification. Many newer systems sold since the federal refrigerant transition use A2L refrigerants (such as R-454B or R-32), which have their own handling and installation requirements. Ask who on the crew is certified, whether they have installed the specific refrigerant your proposed system uses, and how they recover old refrigerant from the unit they remove. Illegal venting or a shrug about “the new stuff” are both reasons to keep shopping.

3. Will you run a Manual J load calculation for my house — not just match the old unit’s size?

Why it matters: Los Angeles is not one climate. A coastal Westside home, a hillside house in Silver Lake, and a two-story in the San Fernando Valley that sees regular triple-digit summer days can need very different capacity. Many older units were sized by rule of thumb or replaced like-for-like for decades. Ask for a Manual J (or equivalent) load calculation that accounts for your insulation, windows, sun exposure, and duct location, and ask to see the results in writing before you pick equipment. Oversized systems short-cycle and leave rooms clammy; undersized ones run nonstop through heat waves.

4. Do you pull the permit with LADBS or my local building department, and does the job include required Title 24 testing?

Why it matters: Replacing a furnace, air conditioner, or heat pump in California typically requires a permit, and the state’s Title 24 energy code can require third-party verification — for example, duct leakage testing by a HERS rater — on many system replacements and duct alterations. Inside City of Los Angeles limits, permits go through the Los Angeles Department of Building and Safety (LADBS); other cities in LA County and unincorporated areas have their own building departments. Ask who pulls the permit, who schedules any HERS verification and the final inspection, and whether those fees are in the quote. A contractor who offers a discount to “skip the permit” is handing you the risk at resale and in any insurance claim.

5. What condition are my ducts in, and will you test and seal them as part of this job?

Why it matters: Many LA homes have ducts running through hot attics or crawlspaces, and older ducts can be crushed, disconnected, or leaking badly. A new high-efficiency unit connected to leaky ducts still delivers weak airflow and high bills — and in California, duct work may trigger testing requirements. Ask whether they will inspect and pressure-test the ducts, what sealing or replacement they recommend, and whether duct design (Manual D) is part of the scope. In older homes, ask how they handle duct insulation or wrap that could contain asbestos; suspect material should be tested before anyone disturbs it.

6. Would a heat pump make sense for my home, and how would it compare with replacing my gas furnace and AC?

Why it matters: Southern California’s mild winters make heat pumps a common option, and state and utility programs have pushed them in recent years. A good contractor should explain the trade-offs for your house: heating and cooling performance, electrical panel capacity, operating cost under your utility rate plan, and what happens to the existing gas line. Ask for side-by-side quotes if you are undecided. Be wary of anyone who dismisses heat pumps without looking at your home — or who pushes one without checking whether your electrical service can support it.

7. Which rebates or incentives might apply, and will you handle the paperwork or leave it to me?

Why it matters: Depending on where you live, your electric utility may be LADWP or Southern California Edison, and your gas utility is often SoCalGas; each can run its own rebate programs, and state and federal incentives change over time. Ask which programs the contractor participates in, whether eligibility depends on specific equipment ratings (SEER2, HSPF2, AFUE), and who submits the application. Get any promised rebate amount in writing as an estimate, not a guarantee — and verify current program rules directly with the utility or program site.

8. What filtration do you recommend for wildfire smoke, and can my system handle a higher-MERV filter?

Why it matters: Wildfire smoke drifts into the LA basin most years. Higher-efficiency filters (for example, MERV 13) can capture more fine particles, but some older systems and undersized return ducts cannot move enough air through a denser filter. Ask whether your system can handle an upgraded filter or media cabinet, whether they will check static pressure after installing it, and what fan settings they suggest on smoky days. A tech who sells an air purifier add-on without measuring anything is selling, not designing.

9. Where will the outdoor unit go, and how will you handle noise, clearances, and neighbors?

Why it matters: On tight LA lots, the condenser or heat pump often ends up close to a property line, bedroom window, or a neighbor’s patio. Local codes and the manufacturer set clearance requirements, and the City of Los Angeles and other cities have noise rules that can apply to outdoor mechanical equipment. Ask where they plan to place the unit, how loud the proposed model is (sound rating in decibels), whether it needs a pad, stand, or seismic anchoring, and how line sets will be routed and protected. Moving a unit after install is expensive.

10. What does the written estimate include — model numbers, electrical work, disposal, and a labor warranty?

Why it matters: A good quote lists the exact indoor and outdoor model numbers, efficiency ratings, thermostat, line set and pad work, any electrical upgrades (new breaker, disconnect, or panel work), permit and testing fees, and disposal of the old equipment. Ask how they handle surprises like a corroded line set or an undersized electrical circuit, and require a stop-and-call change-order process before extra work. Get the manufacturer warranty and the contractor’s labor warranty in writing separately, and confirm who registers the equipment so the manufacturer warranty actually applies.

11. How do you handle no-cooling calls during a heat wave, and can you give me recent Los Angeles–area references?

Why it matters: When temperatures spike, every HVAC company in the region gets slammed at once. Ask what their response time looks like during a heat wave for existing customers, what after-hours or weekend rates apply, and whether a maintenance plan actually moves you up the list. Then ask for two or three recent local references for similar jobs — ideally in a similar part of town and housing type. References tell you about punctuality, cleanup, and whether the system was set up right the first time, which star ratings alone often miss.

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