How Much Does It Cost to Replace an AC Unit? (2026)
When the AC quits in the middle of summer, you need a straight answer fast. Here are the real numbers for 2026 — what an AC replacement costs by system type and size, and the factors that decide where your quote lands.
Typical range
$5,000–$12,000
$3,800–$7,500 for the unit aloneMost homeowners pay around
$7,500
Central AC replacement, average home with existing ductwork, U.S. national average.
Cost by system type
Central AC unit only
Condenser + coil, existing ductwork
$3,800–$7,500
AC + air handler
$5,000–$9,000
Full system (AC + furnace)
Complete heating + cooling swap
$7,000–$14,000
Heat pump (heat + cool)
Replaces both in one system
$5,500–$12,000
Ductless mini-split
Per zone / smaller homes
$3,000–$8,000
Cost by system size (tonnage)
2 ton (≈1,000–1,500 sq ft)
$4,000–$7,000
3 ton (≈1,500–2,000 sq ft)
$5,000–$8,500
4 ton (≈2,000–2,500 sq ft)
$6,500–$10,000
5 ton (≈2,500–3,500 sq ft)
$7,500–$12,000
Rough rule of thumb is one ton per 500–600 sq ft, but the right way to size a system is a Manual J load calculation.
What moves your price
System size (tonnage)
Sized to your home. An oversized or undersized unit wastes money and comfort, so sizing matters more than brand.
Efficiency (SEER2)
Higher-efficiency systems cost more upfront but less to run — and that payback is real in hot climates like Florida.
Ductwork
Repairs, sealing, or new ducts add cost. Mini-splits skip ductwork entirely.
Unit vs. full system
Replacing the AC and furnace together costs more now but shares labor and avoids a second trip later.
Labor & permits
Install labor plus local permits and inspection are part of every legitimate quote.
Brand & warranty
Premium brands and longer parts/labor warranties carry a higher price.
Common questions
How much does it cost to replace just the AC unit?
With existing ductwork in good shape, replacing the condenser and coil typically runs $3,800–$7,500 depending on size and efficiency.
Should I replace the furnace at the same time?
Often yes, if the furnace is also aging. Doing both together shares the labor and avoids paying for a second installation down the road.
What size AC do I need?
A rough guide is one ton per 500–600 sq ft, but the correct method is a Manual J load calculation that accounts for your home's insulation, windows, and layout.
What SEER rating should I buy?
New systems start around SEER2 14–15. In hot, high-use climates, paying up for higher efficiency usually pays back through lower power bills.
How long does an AC replacement take?
A straight swap is usually done in a day. Adding a furnace, air handler, or ductwork can take one to three days.
How long does an AC unit last?
Most central AC systems last about 12–17 years with regular maintenance.
The only number that matters is your quote.
These are national averages. Get real, no-pressure estimates from trusted local HVAC pros and compare for yourself.
Find local HVAC prosFigures are 2026 U.S. national averages compiled for general guidance and will vary by region, scope, and contractor. They aren't a quote.