How Much Does It Cost to Replace an HVAC System in 2026?
The short answer
A full HVAC replacement, meaning a new air conditioner and furnace together, typically runs about $6,500 to $16,000 installed in 2026, with a national average around $11,590 to $14,100. Replacing a single component costs less: central AC alone is roughly $3,000 to $15,000, a furnace alone about $3,800 to $12,000, and a heat pump about $8,000 to $15,000.
Those ranges are wide on purpose, because the same system can cost thousands more in one metro than another. To get a number tuned to your home, run our free HVAC cost calculator, then use the figure below to understand what you are paying for.
Cost by system type
- Central AC only ($3,000 to $15,000): price tracks the tonnage and the SEER2 efficiency rating. Most 2 to 4 ton residential jobs land in the middle of that range.
- Furnace only ($3,800 to $12,000): gas furnaces cost less than the premium modulating and high-AFUE models; fuel type and venting matter.
- Heat pump ($8,000 to $15,000): a heat pump both heats and cools, so it does the work of two units, and modern variable-speed models are more sophisticated equipment.
- Full system, AC plus furnace ($6,500 to $16,000): doing both at once is cheaper than two separate jobs because the labor overlaps and the equipment is matched.
What actually moves the price
Four levers explain most of the spread between quotes:
- Size (tonnage). A bigger home needs more capacity, and a larger unit costs more. Getting the size right also matters for comfort; our HVAC sizing calculator gives you a target before anyone quotes you.
- Efficiency. Higher SEER2 and AFUE ratings and variable-speed equipment cost more up front and less to run each month.
- Ductwork. Reusing sound ducts adds nothing; repairs or a full duct replacement can add a few thousand dollars.
- Local labor and permits. The single biggest reason the identical system costs more in one city than another, which is why HVAC pricing is best understood locally.
Repair or replace?
A common guideline is the 5,000 rule: multiply the repair cost by the unit's age in years, and if the result tops about $5,000, replacement usually makes more sense. A system past 12 to 15 years facing a major repair like a compressor is often worth replacing, especially if it still runs the old R-22 refrigerant, which is expensive and being phased out.
How to avoid overpaying
- Get three quotes on the same system size. Price per ton is only comparable when everyone is bidding the same equipment.
- Size it right first. An oversized system is a common, costly upsell that also cools poorly. Know your target tonnage going in.
- Ask about rebates. Utility and manufacturer rebates, and federal tax credits for qualifying high-efficiency heat pumps, can cut the net cost.
- Consider the shoulder season. Spring and fall are slower for contractors, and quotes can reflect it.
Start with our cost calculator for your range, then the sizing calculator for the target size, and take both numbers into your quotes.