Replacing a central air conditioner and gas furnace together typically costs $6,500 to $18,000 installed in 2026, with most homeowners paying around $10,000 to $12,000. Heat pumps usually cost a bit more up front but can replace both systems in one.
Enter your home size and climate to estimate the system size you need, then choose a system type, efficiency level and ductwork. You will see an itemized estimate and how the other system types compare for your home.
HVAC Replacement Cost Calculator
Size your system and estimate the installed price of a new air conditioner, furnace, heat pump or ductless mini split.
| Item | Typical | Range |
|---|
| System | Typical | Range |
|---|
Sizing is a rule-of-thumb estimate from square footage and climate. A proper Manual J load calculation can change it, and oversized systems cost more and run worse. Prices are 2026 installed ranges including equipment, labor, refrigerant and startup. Ask about utility rebates, which can cut heat pump costs by hundreds or thousands of dollars.
Installed cost by system type
| System | Typical installed cost |
|---|---|
| Central AC, 2 to 3 tons | $4,000 to $12,000 |
| Gas furnace | $2,500 to $7,500 |
| AC and furnace together | $6,500 to $18,000 |
| Heat pump, 3 tons | $5,500 to $15,000 |
| Ductless mini split, per indoor unit | $1,800 to $6,500 |
How to size a system
A quick rule of thumb is one ton of cooling for every 450 to 650 square feet, depending on climate, insulation and windows. That is a starting point only. Ask installers for a Manual J load calculation, because an oversized system short-cycles, controls humidity poorly and costs more to buy.
Frequently asked questions
How much does a new HVAC system cost for a 2,000 square foot house?
A new AC and gas furnace for a 2,000 square foot home usually costs about $8,000 to $15,000 installed, depending on efficiency, ductwork and region. A heat pump system often costs $9,000 to $17,000.
Should I replace my AC and furnace at the same time?
If either unit is more than 12 to 15 years old, replacing both together usually saves on labor, keeps the system matched and can improve efficiency and warranties.
How long does an HVAC system last?
Central air conditioners and heat pumps typically last 12 to 17 years, and gas furnaces 15 to 25 years, with regular maintenance.
Are there rebates for heat pumps?
Many utilities and some states offer rebates for high-efficiency heat pumps. Check your utility website and ask installers which rebates they can apply for you.
More free calculators
- House and barndominium cost calculator
- Roof replacement cost calculator
- All cost calculators and tools
How this calculator works: installed prices use 2026 national ranges per ton for central AC and heat pumps, size-adjusted furnace pricing and per-zone mini split pricing, adjusted for efficiency tier, ductwork and regional labor costs. Sizing uses a square-foot-per-ton rule of thumb by climate. Figures are estimates as of October 2026, not a contractor quote. See our disclaimer.
