Is it cheaper to replace your AC and furnace together? A combined full-system replacement typically runs $8,075 – $10,925 installed — versus roughly $8,575 to $11,600 if you replace the two units in separate jobs. Doing both at once usually saves around $600 and gives you a properly matched system. The calculator below is pre-set to a full system.
💵 What Will a New HVAC System Cost?
Estimate the installed replacement cost of a new central AC, heat pump, gas furnace, full system, or mini-split in the US. Adjust for size, efficiency, add-ons (ductwork, removal, permits) and your region to get a realistic price range — before you call a contractor.
🛠️1. System Type
Pick the system you are replacing. "AC + Furnace" is a full split-system swap (both units at once).
📏2. System Size
Range: 1.5 – 5 Tons (cooling). A typical home is 2–3.5 tons.
⚡3. Efficiency Tier
Higher efficiency (SEER2 / AFUE) costs more up front but lowers running bills. Premium tiers are usually variable-speed / inverter.
📍4. Region
Labor rates vary a lot by metro. This scales the estimate to your area; pick National for a baseline.
➕Add-ons & extras (ductwork, removal, permits) — optional
Full System vs Replacing Separately
| Approach | Estimated Cost (installed) |
|---|---|
| AC only (3 ton) | $4,675 – $6,325 |
| Furnace only (80,000 BTU) | $3,900 – $5,275 |
| Both separately (two jobs) | $8,575 – $11,600 |
| Full system together | $8,075 – $10,925 |
Why Bundling Is Usually Cheaper
Replacing both at once means one service call and one labor mobilization instead of two, a matched AC + furnace pair that runs at its rated efficiency, and often a combined-job discount. If both units are near end-of-life (12–15+ years), together is typically the better value. Use the calculator above to price your exact system, then get three quotes.
Frequently Asked Questions
Is it cheaper to replace AC and furnace at the same time? Usually yes — bundling saves roughly $600 versus two separate jobs (about $8,075 to $10,925 together vs $8,575 to $11,600 apart), plus you get a matched system.
Should I replace both if only one failed? If the other unit is also 12–15+ years old, replacing together avoids a second disruptive job soon and keeps the system matched. If the other is newer, replacing just the failed unit can make sense.
What is a matched system? An AC (or heat pump) and furnace/air handler designed to work together at their rated efficiency. Mixing mismatched components can lower efficiency and may affect warranty coverage.
Not certain it needs replacing? Work through the fault diagnosis guide first.
Estimates vary by contractor. Compare free quotes from licensed local pros before you commit. Request a quote →
High-efficiency systems may qualify for utility rebates and federal or state incentives. Find current programs at ENERGY STAR & DSIRE.
Figures are reviewed by the Refcon HVAC engineering team using U.S. DOE, ENERGY STAR & ACCA Manual J data. Estimates only — confirm with a licensed pro.