What questions should I ask a HVAC technician before hiring?
Always ask a HVAC technician for license number, insurance proof, written warranty, payment schedule, and 3 recent local references before signing anything.
Credentials & legitimacy
Ask: "What's your license number?" "Can I see your Certificate of Insurance?" "How long have you been in business under this name?" Verify everything they say independently — most state boards have free lookup tools.
Scope & timeline
Ask: "What's included — and what isn't?" "How long will the HVAC service take?" "What happens if you discover hidden problems mid-job?" Clear scope prevents the most common dispute: surprise change orders.
Payment & warranty
Ask: "What's your payment schedule?" (Never more than 25% upfront.) "What's covered under warranty, and for how long?" "Do you handle permits?" Get every answer in writing.
References & reviews
Ask for 3 recent local references. Call them. Ask: "Did the final price match the quote?" "Did they finish on time?" "Would you hire them again?" Most homeowners skip this — and pay for it later.
Frequently asked questions
Should I trust a HVAC technician who won't share their license number?
No. Refusing to share a license number is the single biggest red flag in the trades. Move on.
Is a verbal estimate okay?
Never. Always get a written, itemized estimate before any work begins.
What's a normal deposit for HVAC service?
10–25% is standard. Anything higher (especially over 50%) is a major risk.
Keep reading
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Before you call a pro
Common problems
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