HVAC replacement
cost calculator
Get a real cost range for HVAC replacement — furnace + AC, heat pump, ductwork condition, tonnage, and SEER tier.
HVAC replacement cost
Estimates only — always verify with a local contractor before committing. Numbers based on 2026 USA regional labor + material indexes; updated quarterly.
HVAC replacement cost factors
HVAC replacement cost depends on five things — in roughly this order of impact:
- System type. Gas furnace + AC ($7k–$13k) is the cheapest. Heat pumps ($8k–$16k) cost more but qualify for federal tax credits. Dual-fuel (furnace + heat pump) runs $11k–$19k and offers the best efficiency.
- Tonnage. Cost scales roughly linearly with capacity. A 2-ton system runs 25% less than a 4-ton; a 5-ton 30% more.
- SEER tier. 14 SEER (minimum legal) is cheapest. 20+ SEER costs 35% more but cuts operating cost 20–30%. Payback typically 5–8 years.
- Ductwork condition. If existing ducts are leaky, undersized, or wrong material, full replacement adds $2k–$6k. Often discovered mid-install.
- Federal + metro incentives. Federal Inflation Reduction Act offers up to $2,000 in tax credits for heat pumps. Many metros add $500–$2,000 in rebates.
For a deeper walk-through, see the full hvac cost guide.
HVAC replacement cost questions
Is a heat pump worth the extra cost?
In moderate climates (zones 3–5), heat pumps typically cost 15–25% more upfront but cut annual operating cost by 30–50% versus gas furnace + AC. Federal IRA tax credits cover up to $2,000. Payback is usually 4–7 years. In cold climates (zones 6+), dual-fuel systems (heat pump + gas backup) are usually the better choice.
What SEER tier should I pick?
For most homes, 16 SEER hits the sweet spot — modest premium over the 14 SEER minimum, meaningful efficiency gain. Going to 18–20 SEER adds 15–25% to upfront cost; payback depends heavily on local electricity rates and how much you use the system. In hot states (Arizona, Texas, Florida) the higher tiers pay back faster.
Do I really need new ductwork?
If your ducts are over 20 years old, sized for a much smaller system, or visibly damaged: probably yes — and replacement adds $2,000–$6,000. A good installer will inspect existing ducts during the estimate; insist on a static pressure test before committing.
What's the federal tax credit for heat pumps?
The Inflation Reduction Act (IRA) offers up to $2,000 in federal tax credits for ENERGY STAR-rated heat pumps. The Energy Efficient Home Improvement Credit covers 30% of cost up to that cap. Heat pump water heaters and heat pump dryers have separate $1,750–$2,000 caps.
How long does a new HVAC system last?
Gas furnaces: 15–20 years. AC units: 12–15 years. Heat pumps: 12–15 years. Higher-efficiency systems (variable speed, communicating thermostats) often last longer because they cycle less. Annual maintenance ($150–$300/year) extends life by 3–5 years on average.