How Much Does Furnace Installation Cost?
Gas, electric, and oil furnace prices compared. Installed costs by house size, AFUE ratings explained, and signs it is time to replace.
Quick Answer
Gas furnace: $2,500 to $6,000 installed. Electric: $2,000 to $4,000. Oil: $3,000 to $7,000. High-efficiency models cost $1,000 to $2,000 more but save 20 to 30% on heating bills every year.
Gas vs Electric vs Oil Furnace
All-in installed costs, typical operating costs, and key tradeoffs at a glance.
Gas Furnace
$2,500 to $6,000
Pros
Cheapest to operate in most of the US
Fast, powerful heat output
Most common - easiest to service
Cons
Requires gas line (adds cost if none exists)
CO risk if poorly maintained
Electric Furnace
$2,000 to $4,000
Pros
Lowest upfront cost
No gas line or venting required
Very long lifespan, low maintenance
Cons
Expensive to run in most states
Slower heat than gas
Oil Furnace
$3,000 to $7,000
Pros
Works where gas lines do not reach
Very high heat output
Cons
Most expensive to operate
Requires on-site oil storage tank
Oil prices fluctuate significantly
Gas is the most common choice in the US and cheapest to operate in most regions. Electric makes sense where gas lines are unavailable or electricity is cheap. Oil is mainly found in the Northeast.
Cost by House Size
Larger homes need higher-capacity furnaces (measured in BTUs), which cost more. These are all-in installed estimates for gas furnaces.
| Home Size | BTU Needed | Installed Cost |
|---|---|---|
| 1,000 sq ft | 40,000 to 60,000 | $2,500 to $4,000 |
| 1,500 sq ft | 60,000 to 80,000 | $3,000 to $5,000 |
| 2,000 sq ft | 80,000 to 100,000 | $3,500 to $6,000 |
| 2,500 sq ft | 100,000 to 120,000 | $4,000 to $7,000 |
| 3,000+ sq ft | 120,000+ | $5,000 to $8,000 |
Note: Climate zone matters too. A 2,000 sq ft home in Minnesota needs a bigger furnace than the same home in Tennessee.
AFUE Efficiency Ratings Explained
AFUE (Annual Fuel Utilization Efficiency) measures how much of the gas you pay for actually becomes heat in your home.
Cheapest to buy. For every $1 of gas, 80 cents becomes heat and 20 cents goes out the flue. Meets minimum federal efficiency standards. Common in warmer climates where heating is used less.
A meaningful step up. 90 cents of every dollar becomes heat. Costs $300 to $600 more than an 80% unit. A reasonable middle ground for moderate climates.
The best available. A 95% furnace uses 95 cents of every dollar of gas for heat. Condensing furnaces extract heat from exhaust gases that standard furnaces waste. Costs $1,000 to $2,000 more upfront. Payback period: 5 to 8 years if replacing an 80% unit.
When is high efficiency worth it?
Worth the upgrade if you...
- Live in a cold climate (Minnesota, Wisconsin, Colorado)
- Heat 5+ months of the year
- Are replacing an old 80% or lower furnace
- Plan to stay in the home for 7+ years
May not be worth it if you...
- Live in a mild climate (Texas, Florida, Arizona)
- Only use heat 3 to 4 months a year
- Plan to sell the home in the next few years
Signs You Need a New Furnace
Repair bills add up fast on aging furnaces. Here are the clearest signals it is time to replace rather than repair.
Over 15 to 20 years old
Most gas furnaces are designed for 15 to 20 years. At this age, efficiency has declined and parts are harder to source.
Frequent repairs (2+ per year)
If you are calling the HVAC tech more than once a year, the repair costs are often close to what a new furnace payment would be.
Uneven heating room to room
Some rooms cold, others hot? A struggling furnace can no longer distribute heat evenly through the duct system.
Yellow or flickering burner flame
A healthy burner burns blue. Yellow or orange flames can indicate incomplete combustion and a carbon monoxide risk.
Gas bills creeping up
If your heating bills are rising but usage habits have not changed, efficiency is declining. Compare bills year over year.
Excessive dust or dry air
An old furnace loses its ability to clean and humidify air. If you are noticing more dust or static electricity, the unit is failing.
Frequently Asked Questions
How much does it cost to install a new furnace?
Gas furnace installation costs $2,500 to $6,000 total. Electric furnaces run $2,000 to $4,000 installed. Oil furnaces are the most expensive at $3,000 to $7,000. High-efficiency models add $1,000 to $2,000 to the price but cut annual heating bills by 20 to 30%.
Is gas or electric heat cheaper to run?
Gas is cheaper to operate in most of the US. Natural gas typically costs about one-third the price of electricity per BTU of heat. Electric furnaces have lower upfront costs but higher monthly bills. In areas with very cheap electricity (like the Pacific Northwest), electric can be competitive.
Is a 96% AFUE furnace worth the extra cost?
For most homeowners replacing an old 80% furnace, upgrading to a 95 to 96% AFUE model pays back the $1,000 to $2,000 premium in 5 to 8 years through lower gas bills. If your current furnace is 80% efficient or older, a high-efficiency replacement is usually worth it in cold climates.
How long does a furnace last?
Gas furnaces typically last 15 to 20 years with annual maintenance. Electric furnaces can last 20 to 30 years. Oil furnaces average 15 to 25 years. If your furnace is over 15 years old and needing frequent repairs, replacement is usually more cost-effective than continued repairs.