Gas vs electric furnace: which is cheaper?
An electric furnace costs less to install and is 100% efficient with no combustion, flue, or carbon-monoxide risk — but electricity costs more per BTU, so it costs more to run. A gas furnace costs more upfront and needs a gas line, but its cheaper fuel usually wins on the monthly bill in cold climates. One honest note: if you're heating with electricity, a heat pump beats an electric furnace outright. We don't sell either — this is the math.
| Criteria | Gas furnace | Electric furnace |
|---|---|---|
| Upfront cost | $5,200–$8,800 | $2,000–$4,000win |
| Operating cost | Lower where gas is cheapwin | Higher — electricity costs more/BTU |
| Efficiency (AFUE) | 80–96% | 100% (but pricier fuel)win |
| Safety | Combustion, flue, CO risk | No combustion, no COwin |
| Install needs | Gas line + flue venting | Just an electrical circuitwin |
| Cold-climate output | Strong, climate-independentwin | Strong, but costly to run |
| Lifespan | 15–20 yrs | 20–30 yrswin |
How does each furnace make heat?
A gas furnace burns natural gas in a heat exchanger and vents the exhaust up a flue; its efficiency, measured as AFUE, runs 80–96%, meaning a little heat escapes with the exhaust. An electric furnace runs current through resistance elements — no flame, no flue, no exhaust — so all of the electricity it draws becomes heat: 100% AFUE. That sounds decisive until you look at fuel cost, which is where it flips.
More on the efficiency number: AFUE ratings explained.
Is a gas or electric furnace cheaper to run?
Gas, in most markets — and this is usually the deciding number. Because natural gas costs less per BTU of heat than electricity, a gas furnace typically costs $400–$800 a year less to run than an electric one, with the gap widening the longer your heating season. That's why the 100%-efficient electric furnace still loses on operating cost: efficiency measures how much of the fuel becomes heat, not how much that fuel costs. Where you're running heat five or six months a year, the cheaper fuel adds up fast.
What does each cost to install?
An electric furnace is the cheaper install: about $2,000–$4,000, with no gas line or flue to run. A mid-to-high-efficiency gas furnace lands around $5,200–$8,800. But there's a third option the fuel debate often skips — if you're going to heat with electricity anyway, a heat pump costs more upfront ($10,000–$25,000) yet runs cheaper than an electric furnace, because it moves heat rather than making it.
The all-electric comparison in full: heat pump vs furnace.
Which is safer, and what does each need to install?
An electric furnace has no combustion, so it carries no carbon-monoxide risk and needs no flue — just an electrical circuit sized for the load. A gas furnace burns fuel, so it needs a gas line, proper venting, and the CO-safety upkeep a working detector and annual inspection provide. The risk is well managed, but it exists on the gas side and not the electric side. If your home has no gas service, adding it is a real cost that often decides the question on its own. Whichever you choose, a cracked heat exchanger is the CO concern to know about — see carbon monoxide & cracked heat exchangers.
What are the downsides of each?
Neither is flawless — gas's cost is its combustion and upkeep, electric's is its running bill. The honest list:
Gas furnace downsides
- Higher upfront cost
- Needs a gas line and flue venting
- Combustion means carbon-monoxide upkeep
- Exposed to gas-price swings
Electric furnace downsides
- Higher running cost — electricity per BTU
- A heat pump beats it on efficiency for the same fuel
- Can strain an older electrical panel
- Rarely the cheaper option over its lifetime
Which one is right for your situation?
It comes down to gas access, your climate, and whether you're going all-electric — here's the pick for the five most common situations:
One call routes you to a licensed local contractor for a quote: (888) 810-2291.
Common questions
Is a gas or electric furnace cheaper to run?
A gas furnace, in most of the country. Even though an electric furnace is 100% efficient, electricity costs more per BTU of heat than natural gas, so the electric unit typically costs $400–$800 a year more to run — more where you heat for many months.
Is an electric furnace really 100% efficient?
Yes, by the AFUE measure — every unit of electricity becomes heat, with nothing lost up a flue. But efficiency isn't cost: because electricity is more expensive per BTU than gas, 100% efficient electric heat still usually costs more to run than 90%+ gas heat.
Is an electric furnace cheaper than a gas furnace?
Upfront, yes — an electric furnace runs about $2,000–$4,000 installed versus $5,200–$8,800 for a mid-to-high-efficiency gas furnace, with no flue or gas line to add. Over years of running, though, the gas furnace's cheaper fuel usually wins back the difference.
Which furnace is safer, gas or electric?
An electric furnace has no combustion, so it carries no carbon-monoxide risk and needs no flue — a real safety edge. A gas furnace's CO risk is well managed by a working detector and an annual inspection, but the risk exists on one side and not the other.
Should I get an electric furnace or a heat pump?
If you're heating with electricity, a heat pump almost always beats an electric furnace — it moves heat instead of making it, delivering 2–3× the heat per unit of electricity, so it runs far cheaper. An electric furnace mainly makes sense as low-cost backup or in a very mild climate.
How long does each furnace last?
A gas furnace typically lasts 15–20 years; an electric furnace often 20–30, because it has no burner, heat exchanger, or flue to corrode. Both want annual service, and both outlive an AC that shares the same air handler.
Do I need a gas line for a gas furnace?
Yes — a gas furnace needs a natural-gas (or propane) supply and proper flue venting for the exhaust. If your home has no gas service, adding it can be costly, which is often what tips a decision toward electric heat or a heat pump.