HVAC Costs

Heating and cooling is the most expensive machinery in most homes, and the hardest to price from the outside: the same furnace can be a fair $4,800 in one house and a fair $7,000 in another, because the price lives in the details, capacity, efficiency rating, ductwork condition, fuel type and the venting the new unit needs. Our HVAC guides price the complete standard job and then price the details separately, so you can see which lines your home actually has.

Two things worth knowing before the guides:

• Repair vs replace is a maths problem, not a sales pitch. Both guides below carry our free repair-or-replace checker, which weighs your repair quote against replacement using the 50% rule, the unit’s age against its planning life, and the “$5,000 rule”, and shows every step.
• The federal Section 25C tax credit for furnaces and air conditioners ended for equipment placed in service after December 31, 2025. Some cost sites still advertise it. Ours do not: the guides carry the position as it stands, verified against the IRS.

The guides

• Furnace Replacement Cost, $2,800–$7,500 for a standard replacement, most homeowners pay around $4,800. By fuel and efficiency, with the repair-or-replace checker built in.
• AC Replacement Cost, $3,900–$8,100 for a central AC replacement, most pay around $6,000; the full AC + furnace system is priced separately, $6,500–$15,500, so the two scopes are never blurred.

Size the system first

Half of HVAC pricing is capacity. Our BTU Calculator sizes heating and cooling from your floor area, ceiling height, insulation and climate, the same sizing rules the guides use, and explains the result in tons and BTU so a quote’s “5-ton” claim can be checked in seconds.

Seasonal note: furnace and AC quotes firm up in the first cold snap and the first heat wave. Shoulder-season scheduling, spring for AC, early autumn for furnaces, is when honest discounts appear, because installers are pricing to fill their books, not to ration their time.