Electric Furnace vs Gas Furnace
The verdict
With natural gas service available, a gas furnace nearly always costs less to operate in a real winter climate. Electric furnaces make sense in mild climates with short heating seasons, homes without gas service, or as backup for heat pumps. If you are considering electric, compare a heat pump first, since it heats for a third of the cost.
Electric and gas furnaces both push heated air through the same ductwork, but they make that heat completely differently. Electric furnaces run current through resistance coils at 100 percent efficiency but high operating cost, while gas furnaces burn cheaper fuel at 80 to 98 percent efficiency with combustion complexity.
Electric Furnace vs Gas Furnace at a glance
| Electric Furnace | Gas Furnace | |
|---|---|---|
| Heat source | Electric resistance elements | Natural gas or propane combustion |
| Installed cost | $2,500 to $6,000 | $4,000 to $8,500 |
| Efficiency | 100 percent at point of use | 80 to 98.5 percent AFUE |
| Typical operating cost | High, often 2 to 3x gas | Low where gas is cheap |
| Lifespan | 20 to 30 years | 18 to 25 years |
| Safety | No combustion or CO | Requires venting and CO monitoring |
Electric Furnace
Pros
- Lowest purchase and install cost
- No combustion, venting, or carbon monoxide risk
- Very long service life with few moving parts
- Works anywhere with electric service
Cons
- Highest operating cost of any common heating system
- Slow expensive heat in serious winters
- Strains electrical service in older homes
Gas Furnace
Pros
- Much cheaper to run in cold climates with gas service
- Fast, hot supply air
- Mature technology every contractor knows
- High efficiency condensing models reach 98.5 percent AFUE
Cons
- Higher upfront and installation cost
- Annual combustion safety service is essential
- Needs gas service and proper venting
- Heat exchangers eventually fail with age
Performance
Gas furnaces deliver hotter supply air and recover from setbacks quickly, which matters in genuinely cold weather. Electric furnaces produce gentler heat and can struggle to keep up economically when temperatures dive, though they perform the task itself reliably.
Efficiency
Electric resistance is technically 100 percent efficient, but efficiency is not cost. At average national prices, a unit of electric resistance heat costs two to three times its natural gas equivalent. Condensing gas furnaces at 95 plus percent AFUE hold the operating cost crown wherever gas flows.
Maintenance
Electric furnaces need little beyond filter changes and periodic element and sequencer checks. Gas furnaces require annual professional service including heat exchanger inspection, burner cleaning, and carbon monoxide testing, a nonnegotiable safety step.
Repair costs
Electric furnace repairs are cheap and simple: elements, sequencers, and blowers at $150 to $800. Gas furnace repairs span ignitors and flame sensors around $150 to $500 up to $1,500 plus inducer or control board jobs, and a failed heat exchanger typically means replacement.
Who should choose Electric Furnace
Mild winter climates, homes without gas service, tight upfront budgets, and heat pump backup duty.
Who should choose Gas Furnace
Cold climates with natural gas service, owners prioritizing lowest winter bills, and homes with existing venting infrastructure.
Electric Furnace vs Gas Furnace FAQ
Why is my electric furnace so expensive to run?
Electric resistance heat converts expensive electricity directly to heat with no multiplication. At 16 cents per kWh, a winter's heating can cost double or triple the same home on natural gas. A heat pump cuts that electric cost by two thirds by moving heat instead of making it.
Should I switch from electric furnace to a heat pump?
In almost every case, yes. A heat pump uses the same electric supply but delivers 2 to 4 units of heat per unit of electricity versus 1 for resistance coils. Many utilities and the federal tax credit specifically reward this conversion, and your existing ducts usually work as is.
How long do electric furnaces last?
Electric furnaces routinely last 20 to 30 years because they have no combustion stress, just elements and a blower. Gas furnaces average 18 to 25 years, limited by heat exchanger life.