Furnace & AC Replacement Cost Calculator
Instant turnkey estimates for matched furnace, air conditioner, and heat pump systems across the United States. Includes SEER2 efficiency tiers, ductwork, and federal IRA 25C tax credits.
Planning Your HVAC Installation? Explore Our Trusted Guides & Reviews
Whether you need to calculate ductwork upgrades or decide between big-box retailers and independent HVAC equipment brands, check out our in-depth guides:
Leaking or undersized ducts reduce HVAC efficiency by up to 30%. Estimate costs to seal, modify, or replace ductwork ($1,800–$5,500) alongside your new system.
Backed by Daikin engineering, Amana offers some of the best lifetime unit replacement warranties in the industry. See real equipment costs, SEER2 ratings, and pros vs. cons.
Considering big-box store installation? We break down Lowe’s contractor subcontracting process, labor guarantees, pricing markups, and real homeowner experiences.
Explore Home Depot’s HVAC replacement program, installer vetting standards, financing promotions, and how their quotes compare with local independent contractors.
Average Cost of Replacing a Furnace and AC System in 2026
In 2026, homeowners in the United States spend an average of $8,000 to $15,000 to replace a complete heating and cooling system (gas furnace, evaporator coil, and outdoor condenser). Here is how pricing breaks down across common home sizes and efficiency standards:
| Home Size (Sq Ft) | Tonnage Required | Standard (14.3 SEER2 / 80% AFUE) | High-Efficiency (16 SEER2 / 96% AFUE) | Premium Inverter (18+ SEER2 / 98% AFUE) |
|---|---|---|---|---|
| 1,000 – 1,400 sq ft | 2.0 – 2.5 Tons | $6,800 – $8,500 | $8,200 – $10,400 | $11,500 – $14,200 |
| 1,500 – 2,100 sq ft | 3.0 – 3.5 Tons | $7,900 – $9,800 | $9,800 – $12,600 | $13,200 – $16,800 |
| 2,200 – 2,800 sq ft | 4.0 Tons | $9,200 – $11,500 | $11,200 – $14,200 | $15,000 – $19,000 |
| 2,900 – 3,800+ sq ft | 5.0 Tons (or Dual Zones) | $10,800 – $13,600 | $13,400 – $17,000 | $17,500 – $22,500 |
Key Cost Drivers in Residential HVAC Replacement
Four primary factors determine where your total replacement quote lands within the range:
- Bundling Advantage: Installing a furnace and AC condenser together shares the same certified installation crew, vacuum evacuation tools, sheet metal transitions, and permits, saving $1,200 to $2,500 compared to doing each component in separate years.
- SEER2 & AFUE Efficiency Tiers: Going from an entry-level 14.3 SEER2 system to an ultra-efficient 18+ SEER2 variable-speed inverter adds $2,500 to $4,500 to upfront equipment costs, but offsets this through 35% lower monthly electric bills and up to $2,000 in federal tax credits.
- Ductwork Integrity: A high-performance HVAC system connected to old, undersized, or disconnected duct runs will short-cycle and fail prematurely. Minor plenum modifications add $500–$900, while complete duct redesign runs $3,000–$5,500.
- Location Accessibility: Ground-level utility rooms or basements offer the lowest labor rates. Crawlspace and attic installations carry higher installation fees ($500–$900 extra) due to confined space labor and hoisting safety requirements.