Furnace Replacement Cost Calculator
Get a realistic installation estimate for your ZIP Code.
Stop Guessing. Get Your 'Repair or Replace' Verdict in 60 Seconds.
Our algorithm weighs safety risks (like cracked heat exchangers), the 'Red Tag' probability, and repair costs to tell you if your unit is safe to run or a ticking time bomb.
Average Furnace Replacement Cost
Replacing a furnace is often a race against the cold. While a standard 'swap-out' costs between $2,800 and $7,500, moving from a standard efficiency unit (80%) to a high-efficiency one (96%+) can add $1,500+ in venting modifications.
This range reflects typical installations and is meant for planning and budgeting reference only.
- The Efficiency Jump (80% vs 96% AFUE): This is the biggest hidden cost. High-efficiency units cannot use your old metal chimney. They require drilling new holes in your wall to run dedicated PVC venting, significantly increasing labor costs.
- Chimney Liners: If you stick with a standard 80% gas furnace, code often requires installing a new metal chimney liner ($500-$900) to prevent condensation from destroying your masonry.
- Oil-to-Gas Conversion: Switching from oil to gas saves money monthly but costs heavily upfront. You'll need a gas line run to the house and the old oil tank decommissioned/removed.
Use the calculator below to refine your range based on home details.
Repair vs. Replace: When Replacement Usually Makes More Sense
Replace when: Cracked Heat Exchanger ('Red Tagged' by tech), Carbon Monoxide detector keeps going off, or Repair cost > $600 on a 15+ year old unit. Repair when: Flame sensor needs cleaning (Common & Cheap), Bad igniter or blower motor (on unit < 10 years old), or Thermostat wiring issues.
Why Installation Costs Vary
The Efficiency Jump (80% vs 96% AFUE), Chimney Liners, and Oil-to-Gas Conversion can affect the final quote.