"HVAC replacement" can mean a whole system (furnace and air conditioner, or a heat pump) or just one part. Knowing which one you are quoted for is the first step to comparing prices.
Cost by system
| Cost | Source | |
|---|---|---|
| Full system, standard efficiency | $5,000 to $12,500 | This Old House |
| Full system, premium or larger home | Can exceed $22,000 | This Old House |
| Full system, national average | $8,000 ($5,000 to $11,000) | HomeGuide |
| Central air conditioner | $4,000 to $8,000 | This Old House |
| Gas furnace | $3,800 to $10,000 | This Old House |
| Electric furnace | $2,000 to $7,000 | This Old House |
| New ductwork (about 1,000 sq ft) | $1,000 to $2,700 | This Old House |
What affects the price
- System type and efficiency (SEER2 and AFUE ratings).
- Home size, which sets the size (tons) of equipment.
- Ductwork: reusing good ducts saves thousands; new ducts add $1,000 to $2,700 or more.
- Fuel: gas, electric or oil.
Ways to pay less
- Replace in spring or fall, when installers are less busy.
- Ask for a load calculation (Manual J) so you are not sold an oversized system.
- Check utility rebates; the federal 25C credit ended for equipment placed in service after 2025.
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Sources
- This Old House, HVAC installation costs (updated June 12, 2026; mostly Angi pricing data)
- HomeGuide, HVAC system cost (Aug 2025)
Checked October 14, 2026. Prices vary by region, home and contractor. This page is general information.
Frequently asked questions
How much does it cost to replace a furnace and AC?
A full standard-efficiency system typically costs $5,000 to $12,500 installed (This Old House).
How much does a new central air conditioner cost?
About $4,000 to $8,000 installed.
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