Required line items
A complete HVAC system quote should explicitly address each of the following. Items that are genuinely excluded should be stated as exclusions — not left unmentioned.
Equipment — brand & model
Full specification with efficiency rating (SEER2/AFUE/HSPF)
Old system removal & disposal
Including refrigerant recovery and environmentally compliant disposal
Installation labor
Line sets, electrical connections, condensate drain, and mounting
Ductwork assessment
Inspection scope and rate for any repairs found
Refrigerant charge
Specified amount and type (R-410A, R-454B, etc.)
Thermostat
Whether included and model specified
Permits & inspections
Permit fees and inspection scheduling
Startup & commissioning
System testing under operating conditions
Common red flags in HVAC system quotes
These are the most frequently omitted or vague items. Any of them in your quote should prompt a follow-up before you sign.
Brand and model number not specified
HVAC equipment varies enormously in reliability and efficiency. A quote without a brand and model number gives you no basis for comparison and no way to verify what's installed.
Efficiency rating (SEER/AFUE) not listed
Higher-efficiency equipment costs more upfront but saves on utility bills. Without the efficiency rating, you can't evaluate long-term value or compare to other quotes.
Ductwork not assessed
Leaky or poorly sized ducts can undermine even the best equipment. A contractor who doesn't mention duct inspection is either cutting corners or planning a change order.
Old equipment disposal not mentioned
Removing and disposing of old HVAC equipment requires refrigerant handling certification. If disposal isn't listed, ask who handles it and what it costs.
Permit and inspection not included
HVAC installations require permits in most jurisdictions. Unpermitted work can void manufacturer warranties and affect homeowner's insurance.
Three things to confirm before signing any contract
These apply regardless of project type and are the final checks before you commit.
Payment schedule tied to milestones
Never pay more than 30–40% upfront. Each subsequent payment should be tied to a defined milestone — completion of demo, rough-in, finish work, final walkthrough.
All permits identified and assigned
The quote should clearly state which permits are required and who is responsible for pulling them. Unpermitted work can affect your insurance and resale.
Warranty terms in writing
Get both manufacturer warranty details (on materials) and a contractor labor warranty (on the work itself). Verbal warranties are unenforceable.