How Much Does HVAC Replacement Cost in 2026?

Full system vs AC only vs furnace only

The first question is how much of the system you are replacing. Most homes have a split system: an outdoor AC unit and an indoor furnace (or air handler) that share the same ducts.

Source: ConsumerAffairs, May 2026. Assumes the existing ductwork works.

ConsumerAffairs puts the 2026 average for a full replacement at about $11,500, with an overall range of $3,000 to $40,000. Furnaces tend to sit at the low end of the “furnace or boiler” range and boilers at the high end. An AC-only job costs more if the indoor coil or air handler also has to go.

If both units are old, replacing them together usually costs less than two separate jobs a few years apart, because you pay for one crew visit instead of two.

Cost by system type

Your choice of equipment changes the price more than almost anything else.

Source: ConsumerAffairs, May 2026.

• Central AC and furnace is the most common setup and the baseline for most quotes.
• A heat pump heats and cools with one outdoor unit. For a 2,000 sq ft home, This Old House puts a heat pump with air handler at about $8,166 on average, close to the $8,283 average for AC plus gas furnace.
• A ductless mini-split is priced per indoor zone. PICKHVAC gives $1,800 to $6,500 per zone, with an average of $3,500, plus the outdoor unit. A whole house usually needs several zones, but extra zones can cost less if they share one outdoor unit.
• Dual fuel (heat pump plus gas furnace backup) averages $10,787 for a 2,000 sq ft home, per This Old House.

Cost by home size and tonnage

Contractors size systems in tons of cooling (1 ton = 12,000 BTU per hour). Bigger homes need more tons, and more tons cost more.

Source: PICKHVAC, May 2026. Installed cost averages about $1,200 to $3,500 per ton.

This Old House gives two useful real-world checkpoints for an AC with gas furnace at 14.3 SEER2:

Source: This Old House, Jun 2026.

Do not let anyone size your system by square footage alone. ConsumerAffairs recommends a Manual J load calculation, which accounts for insulation, windows and climate. More tons than you need just means a bigger bill.

Ductwork, permits and other extras

These are the items that turn a $9,000 quote into a $14,000 one.

Sources: This Old House, Jun 2026 (ductwork by home size, zoning, permit, thermostat); PICKHVAC, May 2026 (per foot, haul-away).

ConsumerAffairs says duct repairs add about 10% to the bill, while a full new duct system can roughly double it. Add-ons like electrical upgrades, air purifiers and gas line work can add another 5% to 15%. Permits are almost always required, so be wary of a quote that skips one.

SEER2 efficiency: what it costs

SEER2 measures cooling efficiency. A higher number means lower electric bills, but a higher price up front. Here is what This Old House found for an AC with gas furnace in a 2,000 sq ft home:

Source: This Old House, Jun 2026.

Two things stand out. First, 14.3 to 15.2 SEER2 cost about the same, and 15.2 is the ENERGY STAR minimum for central AC, per ConsumerAffairs. Second, the jump to 16.1 SEER2 added about $2,338 on average (our calculation). In the Southeast and Southwest, new central AC must be at least 14.3 SEER2, so check your local minimum before comparing quotes.

The federal tax credit in 2026

The Energy Efficient Home Improvement Credit (section 25C) used to cover 30% of the cost of qualifying equipment, up to $600 for a central AC or furnace and up to $2,000 a year for a heat pump. It has ended. The IRS says the credit “will not be allowed for any property placed in service after December 31, 2025.” A system installed in 2026 does not qualify.

If your new system was installed in 2025, you could claim it on your 2025 tax return. For anything installed now, look for utility rebates and state programs instead. ConsumerAffairs points to the DSIRE database as a place to search for local incentives.

How to pay less

1. Get at least three itemized quotes. Ask each contractor to list equipment, labor, ductwork, permit and haul-away separately so you can compare like for like.
2. Reuse ducts if they test well. PICKHVAC says reusing sealed, tested ducts can save $0 to $2,000.
3. Pick the efficiency you will actually use. In the table above, 15.2 SEER2 cost no more than 14.3, while 16.1 cost much more. PICKHVAC estimates that choosing a mid-range unit over 20+ SEER saves $1,000 to $4,000.
4. Schedule in the off-season. PICKHVAC reports 5% to 15% contractor discounts for off-season work, when demand is lower.
5. Plan before it breaks. An emergency replacement in July leaves no time to compare. Setting aside money with an emergency fund calculator helps, and so does budgeting for the other big home systems, like your water heater replacement cost and roof replacement cost.

See how we research every number on our method page, or browse more home and repair costs.