Using the calculator
How to use the furnace replacement cost calculator.
Use this calculator as a planning tool before you talk to a contractor. It gives a low, typical, and high range so you can compare quotes against a visible set of assumptions instead of relying on one national average.
Start with the inputs you know.
- Enter your repair details. Select the repair type, scope, and any variables that match your situation. The more accurate the inputs, the closer the range will be to a real contractor quote.
- Adjust for severity and access. The calculator adjusts the base cost for condition severity and site access. If you are not sure, leave the defaults — they reflect the most common scenario.
- Review low, typical, and high. The output gives three numbers. Low reflects minimal scope. Typical reflects the most common project. High reflects complex conditions or larger access requirements.
- Bring the range to your contractor conversations. If a quote lands above the high or well below the low, ask the contractor to walk through their scope assumptions. A well-scoped quote rarely falls outside the range.
What changes the price.
The largest price swings usually come from repair method, measured severity, access, and what the quote excludes. For furnace replacement, these are the main factors to review:
- Fuel type: electric, natural gas, propane, or oil
- Efficiency tier: standard 80 percent AFUE versus condensing 95 percent and higher, which changes venting requirements
- Home size and furnace capacity, which should come from a load calculation
- Venting and code work: high-efficiency models need PVC venting and condensate drainage
- Whether the air conditioner is replaced in the same project, which saves combined labor
How to read the estimate range.
The low range, around $2,000, reflects minimal scope and favorable site conditions. The typical range, around $5,200, is the most useful comparison point for an average project. The high range, around $12,000 or more, is where complex conditions, difficult access, or larger scope start to matter.
A basic electric furnace swap can start near $2,000, most furnace replacements land between $3,200 and $7,800 installed, and high-efficiency gas projects with venting changes can reach $12,000.
Common project scenarios.
- Electric furnace replacement: $1,900 to $5,600. Unit plus labor for an electric furnace, most commonly in mild climates or homes without gas service.
- Standard gas furnace (80 percent AFUE): $3,200 to $7,800. The most common replacement. Equipment runs $2,300 to $3,700 with the rest in labor, venting checks, and code items.
- High-efficiency gas (95+ percent AFUE): $7,500 to $12,000. Condensing furnaces add PVC venting and condensate work. Strongest case in cold climates with high fuel costs.
- Furnace and AC replaced together: $5,000 to $12,500. Matched system replacement averaging about $7,500. Bundling saves $500 to $2,000 versus separate projects.
What may not be included.
- Venting replacement or PVC venting for high-efficiency conversions unless itemized
- Ductwork repair, modification, or sealing unless itemized
- Gas line work, electrical panel upgrades, or condensate pumps unless specified
- Permit and inspection fees unless specified
- Chimney liner work when an old furnace leaves a water heater orphaned on the flue
Use the number in contractor conversations.
The estimate is a reference point, not a final answer. If a contractor quote lands far above the high range or unusually far below the low range, ask what scope assumptions explain the difference.
- What capacity does the load calculation call for, and can I see it?
- Is this a standard or condensing furnace, and what venting work does that require here?
- If my water heater shares the chimney, what happens to its venting after the swap?
- Should I replace the AC at the same time, and what does the bundle save?
- What are the equipment, heat exchanger, and labor warranty terms?
Read the Furnace Replacement guideSee the full cost breakdownPrepare a quote request