Hiring an HVAC installer is one of the bigger decisions a homeowner makes. A new system costs thousands of dollars, affects your comfort for 15 to 20 years, and involves work inside your home. The right questions upfront can save you from a bad install, a voided warranty, or a contractor who disappears after the job.

Before you sign anything, here are 12 questions worth asking every installer you consider.

1. Are you licensed and insured? In California, HVAC contractors must hold a valid CSLB license. Ask for the license number and verify it at cslb.ca.gov. Also confirm they carry general liability and workers' compensation insurance. If a worker is injured on your property and the contractor has no coverage, you could be liable.

2. Will you pull the required permits? A legitimate HVAC installation in California typically requires a permit. Permits protect you — they trigger an inspection that confirms the work meets code. Contractors who skip permits are cutting corners, and unpermitted work can cause problems when you sell your home.

3. How do you size the system? Proper sizing requires a Manual J load calculation — not a guess based on square footage. An oversized system short-cycles, wastes energy, and wears out faster. An undersized one runs constantly and never catches up on hot days. Ask how they determine the right size for your home.

4. What brand and model are you recommending, and why? A good installer explains the equipment they recommend and why it fits your home, climate, and budget. Be cautious of contractors who push only one brand without explanation, or who recommend the cheapest option without discussing efficiency ratings.

5. What does the warranty cover? Most equipment comes with a manufacturer warranty, but installation errors are often excluded. Ask what the contractor's labor warranty covers and for how long. A reputable company stands behind their work for at least one year.

6. Will you inspect the ductwork? Installing a new system on old, leaky ducts is like putting new tires on a car with a broken axle. Ask whether they will inspect your existing ductwork and what they recommend if it needs repair.

7. Who does the actual installation? Some contractors sell the job and then subcontract the work to a crew you've never met. Ask who will be in your home and whether they are employees or subcontractors.

8. How long will the installation take? A standard residential replacement typically takes one day. If the estimate is much shorter or longer, ask why. A rushed install is a red flag.

9. What happens if something goes wrong after installation? Ask specifically how they handle callbacks. Do they charge for return visits? How quickly do they respond? A contractor who won't answer this question clearly is one to avoid.

10. Can you provide references from recent jobs? A confident contractor will have no problem connecting you with recent customers. If they hesitate or offer only online reviews, that's worth noting.

11. What efficiency rating do you recommend for my home? Higher SEER ratings mean lower operating costs, but the right rating depends on your climate, usage, and budget. Ask the contractor to walk you through the tradeoff between upfront cost and long-term savings.

12. What is included in the quoted price? Get a written, itemized quote. It should include equipment, labor, permits, disposal of the old unit, and any materials. Vague quotes lead to surprise charges.

At West Coast Air Conditioning, we answer all of these questions before any contract is signed. We're licensed (CSLB #952030), fully insured, and have been serving Calaveras and San Joaquin County since 2010. Call us at (209) 598-8889 for a free estimate.