HVAC replacement cost: central air, heat pumps, and furnaces
$3,500–$7,500 (central AC) · $4,000–$10,000 (heat pump)
Most US homeowners report paying within these bands for a full like-for-like replacement. Furnace-only swaps commonly land $2,500–$7,500. Your quotes will vary by region, home size, and permits.
HVAC is the biggest single-ticket “repair” most homeowners ever approve, and the quotes swing wildly — $4,000 from one installer and $8,500 from the next for the same house. Both can be honest. Capacity, efficiency tier, ductwork condition, refrigerant transition costs, and local labor markets create a genuinely wide corridor. Here's how to read your own quotes.
What drives the cost: labor vs materials vs permits
Equipment (roughly half the bill). Condensers, air handlers, and furnaces are commodity-priced but tiered: builder-grade efficiency vs premium variable-capacity units can double hardware cost. The refrigerant transition to lower-GWP blends has pushed new equipment prices up in recent years, and installers paying more for inventory pass that along.
Labor. A full day for a two-person crew is normal. What makes the day expensive: replacing the line set, rerouting refrigerant lines, electrical upgrades (older panels, dedicated disconnects), condensate routing, roof-curb work on package units, and duct modifications. Expect labor to run roughly $1,200–$3,500 on a typical replacement.
Design and code. A proper quote starts from a Manual J load calculation, not a guess off square footage. Mechanical permits commonly run $75–$400. If a jurisdiction requires a duct evaluation or sealing as part of the permit, that can add $500–$2,000. And note the sequencing trap: a leaky, under-insulated attic inflates the load and therefore the system size you'll pay for — topping up attic insulation before sizing can shrink the equipment you need.
Timing. Peak summer and deep-winter weeks carry demand premiums; shoulder-season scheduling can knock a noticeable slice off.
Cost by system and size
| System | Typical range (installed) | Notes |
|---|---|---|
| Central AC, 2–3 tons | $3,500–$6,500 | Common 1,200–2,000 sq ft homes |
| Central AC, 3.5–5 tons | $5,500–$9,500 | Larger or hotter-climate homes |
| Heat pump (ducted), 2–5 tons | $4,000–$10,000 | Cold-climate models price higher |
| Gas furnace, 80% AFUE | $2,500–$5,000 | Standard-efficiency replacement |
| Gas furnace, 90%+ AFUE | $3,500–$7,500 | Condensing; needs PVC venting |
| Rooftop package unit | $4,000–$10,000 | Crane/roof work adds cost |
| Add-ons: thermostat, zoning, UV | $150–$2,500 | Optional line items — verify you want them |
DIY vs hiring a pro
Central HVAC is the clearest “call a pro” in this whole site. Handling refrigerant requires federal technician certification in the US, most permits are written around licensed installation, and an incorrectly charged system quietly wastes money or fails early. The typical saving people chase ($1,000–$3,000 of labor) is dwarfed by the risk: voided equipment warranties, failed inspections, and re-do costs.
The DIY-adjacent exception is a pre-charged “DIY-friendly” ductless mini-split from a major brand — those are genuinely homeowner-installable and covered in our mini-split guide, with capacity-by-capacity pricing in mini-split cost by BTU. For ducted central systems, hire licensed HVAC.
Difficulty rating: pro-only for anything with refrigerant or gas.
Repair vs replace: where the threshold sits
- The 50% rule. Repair costs more than half of a replacement on a unit past ~10 years? Replace.
- Refrigerant factor. Systems built on R-22 need expensive reclaimed or blended refrigerant; a major leak on an old R-22 unit usually tips the math to replacement.
- Heat exchanger cracks (furnaces). Non-negotiable replacement — this is a safety failure, not a repair.
- Two failures in two years. A unit that needs a second major component is telling you something; the next one is already budgeted in your head anyway.
Conversely: a 5-year-old unit with a $500 capacitor or fan-motor fix should be repaired without hesitation.
Hiring a pro: what a fair quote includes
A real HVAC quote includes: the Manual J load calculation (ask for the summary), exact equipment model numbers and efficiency ratings, matched indoor/outdoor coil confirmation, all line items for line sets, electrical, condensate, and disposal, permit responsibility, and labor warranty length (1+ year is common). Manufacturer equipment warranties of 5–10 years usually require a licensed installer and registration.
Red flags: sizing by square footage alone with no load calc, “tonnage up-sizing” without explanation, huge deposits due up front, door-knockers during heat waves, and quotes where the cheap bid quietly omits the coil replacement everyone else included.
Frequently asked questions
How many tons of AC do I need for a 2,000 sq ft house?
Roughly 2.5–4 tons is the band commonly quoted, but climate, insulation, windows, and shade matter as much as size. Insist on a load calculation rather than a rule of thumb.
Should I replace the indoor coil when I replace the condenser?
Usually yes — mismatched old coils cut efficiency and can void warranties. Ask for matched, certified combinations in writing.
At what point should I stop repairing my AC?
The rule of thumb: repair over ~50% of replacement cost on a 10+ year unit, or any major failure on an R-22 system, points toward replacing.
Is a higher SEER2 rating worth the extra cost?
Depends on cooling hours in your climate. In hot regions the premium often pays back over the unit's life; in mild climates it rarely does. Compare the premium against your actual electric bill, not sales math.
Want a quick ballpark for your tonnage and system type? Open the cost estimator.