Why a heat pump is so efficient
A heat pump does not make heat by burning fuel; it moves existing heat from the outside air into your home, even in cold weather. Because it is moving heat rather than creating it, it delivers two to four units of heat per unit of electricity, an efficiency a furnace physically cannot match. The same unit reverses in summer to cool, so it replaces both your furnace and your AC.
That is the core case for a heat pump: one efficient system for year-round comfort, running on electricity. Size it to your home with the BTU calculator, and see your options in best mini splits.
Where a gas furnace still wins
A furnace burns gas to produce intense, fast heat that does not fade no matter how cold it gets outside. In the coldest climates, or when natural gas is cheap and electricity is expensive, a furnace can be cheaper to run and more reliable in a deep freeze. It also heats up a home quickly on a frigid morning in a way a heat pump working hard in single-digit temperatures cannot always match.
If you live where winters are long and brutal, or you already have cheap gas service, the furnace is still a strong, practical choice.
Why your heat pump bill might be high
A common complaint is a high winter bill with a heat pump, and there are usually two reasons. First, in very cold weather a heat pump's efficiency drops and many systems fall back on electric resistance backup heat, which is expensive. Second, an undersized or basic (not cold-climate) unit runs constantly and leans on that backup. The fix is a properly sized, cold-climate-rated heat pump, and in the coldest areas, pairing it with a gas furnace as backup.
It is also normal for a heat pump to run for long stretches, even all night, in winter. That steady low-output running is how it is efficient, unlike a furnace that blasts and stops. Long runtime is not a malfunction.
The dual-fuel middle ground
You do not always have to pick. A dual-fuel or hybrid system pairs a heat pump with a gas furnace: the heat pump handles the efficient majority of the heating season, and the furnace takes over in the deep cold when the heat pump becomes less efficient. In cold climates with gas service, this is often the best of both, and it is why heat pumps are very much part of the future, just frequently alongside a furnace rather than instead of one.
Heat pump wins on
- +Heats and cools in one efficient system.
- +Two to four times the efficiency of resistance heat.
- +Runs on electricity; no combustion or gas line.
Gas furnace wins on
- +Intense, fast heat that holds in any cold.
- +Often cheaper upfront if a gas line exists.
- +Reliable in the coldest climates.
The verdict
For most of the country, a heat pump is the better choice: it is far more efficient and it cools as well as heats, so it replaces two systems with one. Choose a gas furnace if you live where winters are severe, or where gas is cheap and electricity is dear. In cold climates with gas service, a dual-fuel system, heat pump plus furnace backup, is often the smartest answer. Whatever you pick, size it to your home with the BTU calculator and do not oversize.
Related: BTU calculator, Best mini splits.
Frequently asked questions
Is a heat pump better than a furnace?
For most climates, yes. A heat pump is far more efficient and also cools, so one system does the job of a furnace and an AC. A gas furnace is better in very cold climates or where gas is cheap, because it delivers intense heat that does not fade in a deep freeze. It increasingly comes down to your climate.
Why is my heating bill so high with a heat pump?
Usually because, in very cold weather, the heat pump's efficiency drops and it falls back on expensive electric resistance backup heat, especially if the unit is undersized or not cold-climate rated. A properly sized, cold-climate heat pump, or a dual-fuel setup with a gas furnace backup, fixes most high winter bills.
Is it okay for a heat pump to run all night in winter?
Yes, that is normal and efficient. A heat pump heats by running steadily at low output rather than blasting and shutting off like a furnace, so long runtimes, including overnight, are how it is supposed to work in cold weather. It is not a sign of a problem.
Are heat pumps the future of heating?
Largely yes, because of their efficiency and because they both heat and cool, but often alongside furnaces rather than fully replacing them. In the coldest climates, dual-fuel systems that pair a heat pump with a gas furnace backup are common, combining heat pump efficiency in mild cold with furnace power in the deep freeze.
Do I need a separate air conditioner with a furnace?
Yes. A furnace only heats, so you need a separate central air conditioner or other cooling for summer. A heat pump, by contrast, both heats and cools in one system, which is part of why it can be the more economical overall choice despite a higher upfront price.