9 Questions to Ask HVAC Contractors Before Hiring

Questions to Ask HVAC Contractors

Updated November 6, 2026

What Should You Ask Heating and Air Conditioning Contractors?

Ask for the license number, insurance certificates and a written contract, then ask who runs the job, who pulls permits and what the warranty covers. For this trade, also ask: Will you do a load calculation to size the system? Typical lead time is same day to a week; longer in peak season.

Updated November 6, 2026 · Source: construction.broker planning guide (our own assumptions, not survey data); always compare written bids.

The Questions

What is your license number, and which state or city issued it?
Can you send a current certificate of liability insurance and proof of workers’ compensation?
Will the contract list the scope, materials, price, start and finish dates and payment schedule?
Who pulls the permits, and are they included in the price?
Who will run the job day to day, and will you use subcontractors?
What warranty do you give on labor, in writing?
Will you do a load calculation to size the system?
What are the efficiency ratings of the equipment you quote?
Are there rebates, and who files them?

Good to Know

A proper load calculation matters more than matching the old unit’s size.
Compare the same size and efficiency across quotes.

Cost and Timing

As a planning figure, expect varies widely; compare the system size, efficiency rating and warranty. Typical lead time is same day to a week; longer in peak season. These are our own assumptions, so compare written bids.

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