HVAC replacement is one of the largest mechanical expenses a homeowner faces — and a high-search, high-ticket job for contractors. In 2026 it runs from about $4,000 for a single AC unit to $20,000 for a complete high-efficiency system. Here is the breakdown by component, efficiency, and home size.
HVAC replacement cost by component
- Central AC unit (condenser + coil) — $4,000 to $9,000
- Gas furnace — $3,000 to $8,000
- Heat pump (replaces AC + furnace) — $5,000 to $13,000
- Air handler — $1,500 to $4,000
- Complete system (furnace + AC) — $8,000 to $16,000
- Complete high-efficiency / variable-speed system — $12,000 to $20,000
- Mini-split (ductless), per zone — $3,500 to $8,000
Cost by home size (complete system, mid-efficiency)
- 1,200 sq ft (2-ton) — $7,000 to $11,000
- 1,800 sq ft (3-ton) — $9,000 to $14,000
- 2,400 sq ft (4-ton) — $11,000 to $17,000
- 3,000 sq ft (5-ton) — $13,000 to $20,000
What drives cost
- Efficiency (SEER2 / AFUE) — a 13.4 SEER2 base unit vs. an 18+ SEER2 variable-speed can double equipment cost
- Ductwork — new or repaired ducts add $2,000–$6,000
- Sizing — bigger tonnage = more equipment; oversizing wastes money and comfort
- Fuel switch — going from furnace to heat pump may need an electrical upgrade
- Permits & line set — $300–$1,000; refrigerant line replacement extra
Rebates and tax credits
High-efficiency heat pumps qualify for federal tax credits (up to $2,000) and many utility rebates in 2026 — factor these into the homeowner conversation; they often tip the decision toward a heat pump.
How to quote an HVAC job accurately
Do a load calculation (Manual J) to size correctly, then itemize equipment, ductwork, line set, electrical, permits, and labor. Itemized quotes win against the "one big number" competitor.
FAQ
How long does HVAC last? AC 12–15 years, furnace 15–20, heat pump 12–15.
Repair or replace? If the unit is 12+ years old and the repair is over $1,500, replace.
Build your first estimate in 5 minutes
ConstruMate — AI estimates + bilingual proposals