How to Choose an HVAC Contractor

Every HVAC contractor must hold a valid state license. Check your state's licensing board website to verify. They should carry general liability insurance ($1M+ minimum) and workers' compensation. Ask for certificates of insurance and verify them with the insurance company. An unlicensed or uninsured contractor puts you at legal and financial risk if something goes wrong.

NATE (North American Technician Excellence) certification is the gold standard for HVAC technicians. NATE-certified technicians pass rigorous exams covering installation and service. While not required, companies with NATE-certified techs demonstrate commitment to expertise. Ask specifically about the technicians who will work on your project, not just the company's certifications.

Always get at least 3 written quotes for any HVAC project over $500. Each quote should detail: equipment model numbers, efficiency ratings, warranty terms, labor costs, timeline, and what is/is not included. Be wary of quotes significantly lower than others - this often indicates corners being cut, wrong sizing, or bait-and-switch tactics. The cheapest quote is rarely the best value.

A proper HVAC installation starts with a Manual J load calculation, which determines the exact heating and cooling capacity your home needs based on square footage, insulation, windows, orientation, and climate. Contractors who size systems by rules of thumb (1 ton per 500 sq ft) are guessing. Oversized systems short-cycle, waste energy, and fail prematurely. Undersized systems cannot keep up. A Manual J takes 1-2 hours and should be included in any installation quote.

Check Google reviews, BBB rating, Angi, and HomeAdvisor. Look for patterns in reviews, not just the overall rating. Ask the contractor for 3 recent references and actually call them. Ask references about communication, cleanliness, timeliness, and how issues were handled. A company with 100+ reviews averaging 4.5+ stars with thoughtful responses to complaints is typically reliable.

HVAC warranties have two components: manufacturer warranty (parts) and contractor warranty (labor). Most manufacturers offer 10-year parts warranties but require professional installation and timely registration. Labor warranties vary from 1-10 years. Ask specifically: What is covered? What voids the warranty? Who handles warranty claims - the contractor or manufacturer? Get everything in writing.

Most HVAC installations require building permits and inspections. A reputable contractor handles this. If a contractor says permits are not needed or offers a discount to skip them, walk away. Unpermitted work can: void your warranty, cause insurance claim denials, create problems when selling your home, and pose safety risks. Always verify the permit is pulled before work begins.