AC Installation Cost Calculator

A full 3-ton, 16-SEER2 system swap with a new coil, 25-ft line set, disconnect and pad runs about $6,720 installed nationally — right in the middle of Fixr's $5,000–$12,000 band for 2026. Replacing just the outdoor condenser on a healthy indoor coil drops that to about $5,450, and as low as $4,300 if the line set, disconnect and pad are all reused.

The contractor rule of thumb is one ton per 500–700 sq ft — about 500 in hot, humid or sunny climates and up to 700 in mild northern ones — so a 1,600–2,100 sq ft home usually lands at 3 tons. But sun exposure, insulation, window area and duct leakage swing that by a full ton, which is why a proper Manual J load calculation beats any rule of thumb. Oversizing costs more up front and cools worse: it short-cycles and leaves air clammy.

Two regulatory waves hit at once. The DOE's 2023 SEER2 standard raised the floor to 13.4 SEER2 in northern states and 14 SEER2 in the south, forcing redesigned equipment. Then the EPA's HFC phase-down pushed new systems off R-410A onto lower-GWP refrigerants (R-454B, R-32) from 2025, retooling entire product lines. Equipment — not labor — absorbed most of the increase, which is why installation labor has moved far less than unit prices.

Sometimes, and it saves roughly $1,270 on a 3-ton job. The catch: the condenser and indoor coil must be AHRI-matched or you lose the rated efficiency, risk warranty denial, and can strand performance if the old coil was built for the phased-out R-410A refrigerant. If your indoor unit is more than a few years old, most contractors will steer you to the full-system price — get the match certificate in writing either way.

Moving from a 14.3 to a 16 SEER2 condenser adds about $630 in equipment at 3 tons and cuts cooling energy roughly 11%; HVAC Project Cost's payback math puts that upgrade at 5–9 years in hot climates but 10–15 in mild ones. The jump to 18 SEER2 costs about $1,410 more ($1,410 installed end to end in this model) and can take 12–20+ years to recoup. High SEER2 pays in Texas or Florida; in Minnesota it is usually a comfort purchase, not a financial one.

A straight condenser swap on an existing pad and line set is a half-day job — 4 to 8 hours. The crew recovers the old refrigerant, sets the new unit, brazes the joints, pressure-tests with nitrogen, then pulls a deep vacuum before weighing in the charge — that evacuation step is what separates a careful install from a rush job and protects the compressor. Add a few hours for a new line set run, and plan on a full day when the pad, indoor coil and disconnect are all new; a new 240V circuit usually means a separate electrician visit before the HVAC crew arrives. The mechanical inspection closes the permit a day or two after the work.

Yes, almost everywhere — mechanical permits are required for equipment replacement in most US jurisdictions. The inspection that follows verifies the things a rushed install gets wrong: refrigerant handling, a disconnect within sight of the unit, clearances to property lines and openings, and line-set protection where it passes through walls. Your contractor normally pulls the permit and the card should be posted at the condenser — ask for the permit number before work starts, and get the final inspection signed off before releasing final payment. Unpermitted installs can bite later at resale or on insurance claims.

Ductwork (new ducts can add thousands — see the ductwork calculator), air handlers shared with a gas furnace or heat pump conversions, crane lifts for rooftop equipment, thermostat upgrades, and disposal of the old unit unless your installer includes haul-away. Fixr notes most 2026 installs land between $5,000 and $12,000 precisely because these scope items vary so much.