How Much Does HVAC Replacement Cost?
By the HomeLintel Editorial Team · Reviewed 2026-08-24
Replacing a complete HVAC system — cooling and heating together — typically costs $7,500–$19,500 for a US single-family home, with most projects around $12,000 when existing ductwork is reused. Replacing only one side (AC alone or furnace alone) costs less individually but often more in total if the second component fails within a few years.
The 'replace together or separately' question is the big one: matched systems perform to their rated efficiency, carry cleaner warranties, and cost less than two separate installs. If both components are past 12–15 years, replacing together is usually the better economics.
Cost breakdown: complete system (AC + furnace)
| Item | Typical range | Notes |
|---|---|---|
| Condenser + coil (3-ton class) | $3,000 – $6,500 | SEER2 rating drives the equipment spread. |
| Gas furnace (80–96% AFUE) | $1,800 – $4,500 | Condensing (90%+) units cost more, save fuel. |
| Labor (2–4 crew-days) | $2,000 – $5,000 | Removal, set, lineset, charge, commissioning. |
| Duct repairs/modifications | $0 – $2,500 | Sealing, resizing returns; full duct replacement is its own project. |
| Electrical & controls | $300 – $1,200 | Disconnects, thermostat, condensate handling. |
| Permit & inspection | $150 – $600 | Mechanical permit in most jurisdictions. |
Heat pump instead? The 2026 default question
Every full-system replacement in 2026 should price the heat pump alternative alongside AC-plus-furnace. A heat pump replaces both components with one system at broadly similar installed cost, and in most of the country it runs cheaper across the year. Where winters are severe or gas is unusually cheap, dual-fuel (heat pump + gas furnace backup) covers both bases. Our heat pump installation guide covers that path in depth — get quotes both ways and compare honestly.
What raises the price
Between an $8,500 quote and a $17,000 quote on the same house, the usual movers:
- Efficiency tier — builder-grade 14.3 SEER2 vs 17+ SEER2 variable-speed equipment is a $2,500–$5,000 equipment swing.
- Duct condition — leaky or undersized ducts throttle any new system; sealing and return upsizing add $500–$2,500, full replacement $3,500–$8,000.
- Access — attic air handlers, crane lifts for rooftop units, and tight closets add labor.
- Line set and code items — replacement lineset, surge protection, condensate safety switches, and updated disconnects are legitimate adds, not padding.
- Sizing changes — a Manual J load calc that moves you a size up or down beats rule-of-thumb matching of the old unit.
Repair or replace?
Under 10 years: repair almost everything short of a failed compressor out of warranty. Ten to fifteen years: the $5,000 rule of thumb helps — multiply repair cost by system age; over ~$5,000, put the money toward replacement. Past 15 years: major repairs (compressor, heat exchanger, coil) are replacement triggers, and a cracked heat exchanger on a furnace is an immediate safety-driven replacement, not a judgment call.
Frequently asked questions
How much does a new HVAC system cost?
Complete AC-plus-furnace replacement: $7,500–$19,500 installed, typically around $12,000 reusing sound ductwork. Equipment efficiency tier and duct condition are the two biggest variables.
Should I replace my AC and furnace at the same time?
If both are past 12–15 years, usually yes: matched systems hit their rated efficiency, share one labor mobilization, and avoid a second install cost within a few years. A young furnace paired with a dead AC is the main exception.
How long does HVAC replacement take?
A straightforward full-system swap takes 1–3 days. Duct modifications, attic installs, or conversions (gas to heat pump) extend to a week.
How long do HVAC systems last?
Central AC and heat pumps: 12–17 years. Gas furnaces: 15–20, sometimes more. Coastal salt air, poor maintenance, and oversizing shorten all of these.
Related resources
Sources & methodology
- US DOE — Central Air Conditioning — efficiency and sizing guidance
- ENERGY STAR — HVAC — certified equipment criteria
Cost ranges are HomeLintel editorial estimates built from the listed sources and our published assumptions — they are not quotes. Last reviewed 2026-08-24. See how we estimate costs.