How Much Does It Cost to Replace a Furnace in 2026?
The average cost to replace a furnace is $2,500 to $6,000 installed. Here is what drives that range, how to choose the right efficiency rating, and when to repair vs replace.
A failing furnace in winter is one of the most urgent home repairs a homeowner faces. The average cost to replace a furnace runs $2,500 to $6,000 installed, with most homeowners paying around $3,500 to $4,500 for a mid-efficiency gas furnace in an average sized home.
Average Cost to Replace a Furnace in 2026
| Furnace Type | Unit Cost | Installed Total |
|---|---|---|
| 80% AFUE gas furnace | $800 to $1,500 | $2,000 to $3,500 |
| 95% AFUE gas furnace | $1,200 to $2,500 | $3,000 to $5,500 |
| 98% AFUE gas furnace | $1,500 to $3,000 | $3,500 to $6,500 |
| Electric furnace | $700 to $1,500 | $1,500 to $3,500 |
| Oil furnace | $1,500 to $3,000 | $3,500 to $7,000 |
Understanding Efficiency Ratings
AFUE stands for Annual Fuel Utilization Efficiency. An 80% AFUE furnace converts 80 cents of every dollar of fuel into heat. A 95% AFUE furnace converts 95 cents. The higher efficiency units cost $500 to $1,500 more upfront but reduce fuel bills by 15 to 20% annually. In cold climates where you run the furnace 6 months a year, a high efficiency furnace typically pays for itself in 5 to 8 years.
Safety First: Carbon Monoxide Protection
Any time a furnace is replaced or serviced, make sure your home has working carbon monoxide detectors on every level. A carbon monoxide detector is a non-negotiable safety item in any home with gas appliances. CO is odorless and colorless and a malfunctioning furnace heat exchanger can release dangerous levels without any warning. Replace detector batteries annually and the unit itself every 5 to 7 years.
Two Things to Do After Your New Furnace Is Installed
A smart thermostat paired with your new furnace pays for itself quickly. It learns when you are home and away, adjusts heating schedules automatically, and can cut heating costs by 10 to 15% compared to a basic thermostat. Most modern furnaces are compatible with leading smart thermostat brands.
Protect your new furnace investment with regular filter changes. A quality HVAC filter set keeps the heat exchanger clean and airflow unrestricted. A clogged filter is the most preventable cause of furnace inefficiency and premature failure. Change filters every 1 to 3 months during heating season.
Should You Repair or Replace?
Replace your furnace when it is over 15 years old and needing significant repairs, when repair costs exceed 50% of replacement cost, or when you have had two or more major repairs in the past two years.
A cracked heat exchanger is a special case and a safety hazard. If your HVAC technician identifies one, replacement is almost always the right call regardless of furnace age.
The Free Fix to Try First
Before assuming your furnace needs replacement, check the simple things. A furnace that will not start is often caused by a tripped circuit breaker, a dirty air filter restricting airflow, a thermostat set incorrectly, or a pilot light issue on older units. These cost nothing to check and fix a surprising number of service calls.
Bottom Line
Budget $3,000 to $5,000 for a quality 95% AFUE gas furnace professionally installed in an average sized home. Get three quotes, insist on proper sizing, and ask about utility rebates before signing anything.
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