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 a HVAC system contract
These are the final checks before you commit — specific to what matters most in a HVAC system project.
30–40% upfront with equipment order — remainder after commissioning
HVAC contractors often request large deposits because equipment must be ordered. Limit upfront payment to 30–40%, and withhold the remainder until startup commissioning is completed with verified airflow and temperature performance — not just placement of the outdoor unit.
Permit required — skipping it can void the manufacturer warranty
HVAC installations require permits in most jurisdictions, and manufacturers often require permitted installation to honor equipment warranties. Unpermitted HVAC work can void a 10-year warranty and create issues if you ever file a homeowner's insurance claim.
Equipment warranty and labor warranty are separate — get both in writing
HVAC work involves two distinct warranties: equipment manufacturer warranty (typically 5–10 years, parts only) and contractor labor warranty on installation (typically 1 year). Confirm both are in writing, and verify that the installation qualifies for the manufacturer's full warranty term.