How much does furnace replacement cost?
Replacing a furnace typically costs $3,000–$7,500 installed. Standard-efficiency gas furnaces sit at the low end; high-efficiency (96%+ AFUE) condensing models, oil furnaces, and jobs needing new venting or gas work run higher.
Ranges are typical planning guides — actual price varies by region, access, materials and your local pro. Always get a written quote.
| Type | Typical cost | Notes |
|---|---|---|
| Electric furnace | $2,000–$4,500 | Cheap unit, pricey to run |
| Gas, 80% AFUE | $3,000–$5,500 | Most common replacement |
| Gas, 96%+ AFUE condensing | $4,500–$7,500 | New PVC venting + condensate drain |
| Oil furnace | $5,000–$9,000 | Regional; tank may add cost |
What affects the price
Fuel type and efficiency
An 80% AFUE gas furnace is the budget pick. A 96%+ condensing model costs $1,500–$2,500 more but burns noticeably less gas and often qualifies for rebates.
Venting and gas line changes
High-efficiency furnaces vent through PVC, not the old flue — rerouting venting, relining a chimney, or upsizing the gas line each add hundreds.
Size and location
Bigger homes need higher-BTU units, and attic or crawl-space installs take longer than a swap in an open basement or garage.
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How much does furnace replacement cost?
Typically $3,000–$7,500 installed. An 80% gas furnace runs $3,000–$5,500; a high-efficiency condensing model runs $4,500–$7,500.
How long does a furnace last?
15–20 years for gas, 20–30 for electric. Once repairs on an old unit hit $1,000+, replacement usually makes more sense.
Should I replace the furnace and AC at the same time?
If both are 12+ years old, yes — combined installs save $1,000–$2,000 on labor versus two separate jobs, and matched equipment runs better.