Replacing a heating and cooling system is one of the biggest home expenses most people face. This guide covers what it costs by system type, the signs it's time, how efficiency and rebates change the math, what the install involves, and what to ask before you sign.
Installed ranges for a typical single-family home. Your price depends on system size, efficiency, ductwork, and region — the HVAC Cost Estimator tailors it to your home.
| What you're replacing | Typical installed range | Calculator |
|---|---|---|
| Central AC only | $5,500 – $9,500 | AC Replacement Cost |
| Furnace only | $3,500 – $7,500 | Furnace Replacement Cost |
| Full system (AC + furnace) | $8,000 – $16,000 | HVAC Installation Cost |
| Heat pump (ducted) | $10,000 – $18,000 | Heat Pump Install Cost |
| Ductless mini-split (multi-zone) | $8,000 – $20,000 | Heat Pump Install Cost |
| Add / resize ductwork | +$2,000 – $8,000 | — |
AC and heat pumps past ~15 years, furnaces past ~20. R-22 systems (pre-2011) are worth replacing when a major repair comes up.
A repair over half the price of a new system, or repeated failures in a short time.
Energy costs creeping up despite maintenance often means the system has lost efficiency.
Rooms that never reach temperature, high humidity, or a system that runs constantly.
Loud operation, or dust and musty odors that persist after cleaning.
Replacing on your schedule — not in a July heat wave — means better pricing and equipment choice.
Efficiency. Systems are rated by SEER2 (cooling), HSPF2 (heat pump heating), and AFUE (furnace heating). Higher-rated equipment costs more up front but uses less energy. The right choice depends on your climate and energy prices — compare with the HVAC Operating Cost Calculator.
Sizing. A properly sized system is critical. An oversized unit short-cycles, wears out faster, and leaves humidity behind; an undersized one runs constantly. A good contractor performs a Manual J load calculation rather than matching the old unit's size. Sanity-check with the AC Sizing Calculator.
Rebates. The federal 25C tax credit covers 30% of a qualifying heat pump (up to $2,000) and smaller amounts for high-efficiency AC and furnaces. Many states and utilities add rebates. Programs change often — confirm current offers, and ask your contractor which equipment qualifies.
A straightforward full-system replacement takes one to two days. New ductwork or a mini-split with several zones can take longer. A typical job includes:
A quote well below the others usually skips something — a permit, a load calculation, proper line-set replacement, or a startup commissioning. Ask what's included.
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A like-for-like replacement of a central AC and gas furnace typically runs $8,000 to $16,000 installed. Replacing just the AC runs $5,500 to $9,500, a furnace $3,500 to $7,500, and a heat pump system $10,000 to $18,000. New or resized ductwork adds several thousand dollars.
Central air conditioners and heat pumps typically last about 15 years, and gas furnaces about 20, with regular maintenance. Systems past roughly 75% of that range are approaching the point where replacement is worth considering.
If both are old, replacing them together usually costs less than two separate jobs and keeps the system matched for efficiency. If one is significantly newer and working well, replacing just the failed component can make sense.
The federal 25C tax credit covers 30% of a qualifying heat pump, up to $2,000, and smaller credits for high-efficiency AC and furnaces. Many states and utilities add rebates. Confirm current programs before you buy.
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