Heat Pump vs. Furnace: An Honest Take From a Guy Who Installs Both
By Mike Sullivan · HVAC contractor since 1993 · Updated
I don't have a horse in this race. I've installed gas furnaces for 30 years and heat pumps for almost as long. Whatever you pick, I've hung my hat on both. So here's the comparison the sales guys won't give you straight.
First, plain English
A furnace burns fuel — usually natural gas — to make heat. Simple, powerful, been around forever.
A heat pump is basically an air conditioner that runs both ways. In summer it moves heat out of your house. In winter it flips around and pulls heat from the outside air into your house. One machine, heating and cooling both.
That "moves heat instead of making it" trick is why heat pumps are cheap to run. Moving heat takes a lot less energy than making it from scratch.
The honest comparison
| Gas furnace | Heat pump | |
|---|---|---|
| Up-front cost (installed) | $4,000–$8,000 | $7,000–$14,000 (but it replaces your AC too) |
| Monthly running cost | Depends on gas prices | Usually lower, especially in mild climates |
| Comfort feel | Hot, fast blasts | Steady, even warmth |
| Deep-cold performance | Doesn't care how cold it is | Modern cold-climate units work below 0°F, older ones struggle |
| Lifespan | 15–20 years | 12–15 years (it runs year-round) |
| Also cools your house | No | Yes |
Who should get a furnace
- You have cheap natural gas and your ductwork is set up for it.
- You live somewhere with brutal, long winters and want maximum muscle on the coldest nights.
- Your AC is newer and only the furnace is dying — no sense tossing a good AC.
Who should get a heat pump
- Your furnace and AC are both past 12 years. One machine, one install, done.
- You heat with propane, oil or electric resistance today — a heat pump usually cuts those bills hard.
- You're in a mild or moderate climate. This is where heat pumps shine brightest.
- You want one system to maintain instead of two.
Not sure which side of the line your house lands on? That's literally what a quote visit is for. I'll match you with licensed local installers who'll run the numbers on both options — free.
Help Me Compare Both Options →Free · about 60 seconds · no obligation
The cold-weather question everyone asks
"Do heat pumps work when it's freezing?" Ten years ago, my honest answer was "eh." Today? Cold-climate models keep pumping out heat well below zero. I've put them in homes that see -10°F winters, paired with a small backup heat strip for the worst nights, and the homeowners stopped calling me — which in my business is the highest compliment there is.
That said: if you're in the far north and gas is cheap on your street, a high-efficiency furnace is still a perfectly smart buy. Anyone who tells you one answer fits every house is selling something.
What about the dual-fuel setup?
There's a middle path I like a lot in cold states: a heat pump paired with a gas furnace as backup. The heat pump handles 90% of the season cheap, and the furnace kicks in only on the brutal nights. Costs more up front, but it's the best of both worlds if you're staying in the house long-term.
Bottom line
If I'm replacing both heating and cooling in a mild-to-moderate climate: heat pump, no hesitation. Deep-cold climate with cheap gas and a working AC: furnace. On the fence: get quotes on both and let the real numbers decide — that's what I'd do in my own house, and it's free to do in yours. Wondering what those numbers look like? Start with my 2026 cost breakdown.
Get both options priced for your home.
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