Start with a diagnosis and a written scope
Ask a qualified HVAC professional to identify the failure and explain which parts and labor are included. A symptom such as short cycling or uneven temperatures can have several causes.
For replacement, compare equipment model numbers, capacity basis, efficiency, ductwork scope, commissioning, permits, and warranty coverage.
Compare today’s cost with the next few years
A low repair estimate may be sensible on a newer system with a clear fix. An expensive repair on older equipment can justify getting a replacement quote too—but age by itself is not proof that replacement is best.
- Repair total and any diagnostic fee
- Expected remaining service life after repair
- Replacement installed cost and written inclusions
- Energy-use difference only when supported by a credible estimate
Account for comfort and uncertainty
Reliability, indoor comfort, refrigerant type, and the likelihood of repeat visits matter alongside the first-year dollars. Build a contingency into any project plan and avoid relying on a single payback estimate.
Fictional scope comparison
Worked example: a cheaper HVAC bid with excluded work
Fictional illustration only. These amounts are not market prices, quotes, or recommendations.
Bid A · lower starting total
$10,800 for equipment and installation. The written scope excludes the specified duct repair. The contractor separately prices that work at $1,900, making the known subtotal $12,700.
Bid B · more work in the base scope
$12,300 for the same equipment class and installation scope, including the specified duct repair. The written proposal still lists an electrical correction as “if required” with no price.
What to resolve: The $1,900 duct item is a known extra because it has a price. The electrical correction is unpriced—not $0. Until both proposals state who handles that work and what it costs, neither is a confirmed all-in total.
Take it to the bid review
HVAC questions to copy into your bid review
- What are the exact indoor and outdoor equipment make, model, capacity, and matched-system numbers?
- Which room-by-room sizing or load calculation supports the selected capacity?
- Are existing ducts inspected, sealed, repaired, balanced, or replaced? What is excluded?
- Are electrical circuits, disconnects, panel work, condensate routing, and code corrections included or priced separately?
- Who obtains permits and inspections, and are the fees included?
- Which startup measurements and commissioning tests will be recorded at handoff?
- What labor warranty applies, for how long, and what work or trip charges are excluded?
- Who removes and disposes of the old equipment?
Source and scope
Angi · AC replacement cost guideThis is a national central-AC reference, not a furnace-plus-AC bid or a local price. The worked examples above are fictional.
This guide offers general planning information, not a local estimate or professional diagnosis. We do not include unsourced market statistics; see our methodology and editorial policy.