How much does it cost to replace a gas furnace? Nationally, a gas furnace replacement typically runs $3,900 – $5,275 installed for a 80,000 BTU standard-efficiency system. Your final price depends on size, efficiency tier, add-ons and local labor rates. The calculator below is pre-set to a gas furnace — adjust it for your home.
💵 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
Gas Furnace Replacement Cost by Size
Typical US installed price ranges at standard efficiency. Bigger equipment costs more; high-efficiency models and add-ons push these higher:
| Size | Estimated Cost (installed) |
|---|---|
| 60,000 BTU | $3,575 – $4,825 |
| 80,000 BTU | $3,900 – $5,275 |
| 100,000 BTU | $4,275 – $5,775 |
| 120,000 BTU | $4,625 – $6,250 |
What’s Included in a Gas Furnace Replacement
A quote covers equipment (the unit itself) plus labor, and often add-ons: old-system removal, a new line set, electrical or breaker work, permits and inspection, and sometimes new ductwork. Equipment is usually 45–55% of the total and labor the rest. High-efficiency models cost more up front but lower running bills and may earn rebates or tax credits. Use the calculator above to add the extras your job needs.
Frequently Asked Questions
How much does gas furnace replacement cost? Nationally, expect about $3,900 to $5,275 installed for a 80,000 BTU standard-efficiency unit. Size, efficiency, add-ons and your local labor rates move the final number.
What makes Gas Furnace quotes vary so much? The biggest swing factors are add-ons (ductwork, electrical, removal, permits), the efficiency tier, equipment brand, and local labor rates. Always compare line items, not just the bottom line, and get three quotes.
Is a high-efficiency Gas Furnace worth it? Often, over time. It costs 20–45% more up front but cuts energy bills every month and may qualify for utility rebates or federal tax credits, with payback frequently in 4–8 years.
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.