A full HVAC replacement (furnace and AC) typically runs $5,000–$12,000 installed. AC-only replacements are less; high-efficiency systems and ductwork push it higher.
What affects the price
System size
Bigger homes need more tonnage — and bigger equipment.
Efficiency (SEER)
Higher-SEER systems cost more but cut energy bills.
Ductwork
Repairing or replacing ducts adds $1,000–$3,000.
Scope
AC-only vs full furnace + AC changes the total significantly.
Cost breakdown
National-average planning ranges — your local pricing varies by region, scope, and access.
DIY or hire a pro?
HVAC replacement requires EPA refrigerant certification and permits — this is licensed-pro-only work.
Estimating this job?
Use the free size the system, then turn it into a priced quote your customer can approve with the free estimate generator.
FAQ
How much does it cost to replace just the AC?
An AC-only replacement usually runs $3,500–$7,500 installed, depending on tonnage and SEER rating.
How long does an HVAC system last?
A well-maintained system lasts 15–20 years. Rising repair bills and rooms that won’t hold temperature are signs it’s time.
Is a higher SEER rating worth it?
In hot climates with heavy AC use, a higher SEER pays back through lower bills. In mild climates the payback is slower.