Short answer
Verify the contractor's license with your state or local licensing authority, ask for written quotes with model numbers and permit included, and expect a load calculation for replacements. Be cautious of pressure to sign on the spot or prices quoted without measurements.
License
Licensing varies: some states license HVAC contractors through a state board, while others leave it to cities and counties. Our state pages explain who licenses HVAC work in each state. Check the license number, its status and any limits.
Quotes
Compare like for like.
- Model numbers and SEER2/AFUE/HSPF2
- Permit included
- Warranty terms (parts and labor)
- What's excluded
Red flags
Cash-only deals, no permit, refusing to put anything in writing, and 'today only' pricing.
Ask how they'll size the system
A replacement quote should be based on your home, not just the size of the old unit. Ask whether the contractor will perform a Manual J load calculation and inspect or test the ductwork. Oversized systems can short-cycle and leave humidity behind; undersized systems run constantly on the hottest days.
Questions to ask before you sign
Good contractors answer these without hesitation.
- Is the business licensed and insured, and can I see the license number?
- Who pulls the permit and schedules the inspection?
- What is the parts warranty and what is the labor warranty?
- Will the manufacturer warranty be registered for me?
- What is the payment schedule?
- How will you protect the home and dispose of old equipment?
Comparing quotes fairly
The lowest price can hide missing items. Line up quotes by equipment model numbers, efficiency ratings, included accessories (pad, line set, thermostat, drain work), labor warranty length and permit. Ask each contractor to explain why they chose that equipment size.
Check reviews the right way
Read recent reviews across more than one platform and look at how the company responds to complaints. A pattern of the same problem matters more than one bad review.
Questions
Should the contractor pull the permit?+
Yes. A licensed contractor normally pulls the mechanical permit and schedules the inspection.
How many HVAC quotes should I get?+
Two or three written quotes for a replacement is common. For a repair, one diagnosis plus a second opinion on a costly repair is reasonable.
What's the difference between a parts warranty and a labor warranty?+
The manufacturer's parts warranty covers failed components. A labor warranty, from the contractor, covers the cost of the technician's time to replace them. Ask for both in writing.
Should I pay the full amount up front?+
A deposit is common for installations, but paying in full before work is complete is a risk. Ask for a payment schedule tied to completion.
Editorial note: this guide is general information for homeowners, not a diagnosis. Desertline Heating & Air is a referral service; a licensed contractor should inspect your equipment before repairs.