Ten years ago, the advice was simple: if you live north of Nashville, install a furnace. Heat pumps couldn't keep up in real cold. That advice is now wrong. Cold-climate heat pumps have improved dramatically in the last five years — what the industry calls cold-climate variable-speed inverter heat pumps can hold their efficiency down to -15°F. Homes in Minnesota and Vermont are running heat pumps year-round now, something that was impractical a decade ago.
That doesn't mean heat pumps are the right answer for everyone. It means the decision is more nuanced than it used to be, and a lot of homeowners are getting bad advice from HVAC contractors who haven't updated their assumptions.
How Does a Heat Pump Actually Work?
A heat pump is an air conditioner that runs in reverse. Instead of burning fuel to generate heat, it moves heat from outside to inside. Even in cold air, there's thermal energy a refrigerant cycle can extract. The reason this is efficient is you're not generating heat, you're relocating it — every dollar of electricity a heat pump uses pulls 2-3 dollars worth of heat from the outside air.
A gas furnace, by contrast, generates heat by burning fuel. The best condensing furnaces reach about 96-98% efficiency — meaning 96-98% of the energy in the gas becomes heat. A heat pump at its efficient temperatures operates at 250-400% efficiency, not because it violates physics, but because it's moving heat rather than making it.
What's the Crossover Temperature?
As outdoor temperatures drop, a heat pump becomes less efficient. There's a temperature where it becomes cheaper to burn gas than to run electricity through the heat pump. That crossover temperature depends on your local gas prices, your local electricity prices, and the specific heat pump's cold-weather performance.
For most of the country in 2026, the crossover is roughly 15-25°F. Above that, a modern heat pump is cheaper to run than a gas furnace. Below that, a furnace wins. If you live in a climate where winter temperatures rarely go below 20°F (most of the South, West Coast, much of the Mid-Atlantic), a heat pump is probably the cheaper choice to run year-round. If you live in a climate where you spend weeks at a time below 10°F (Minnesota, Maine, Montana), a furnace is still cheaper to operate during those stretches.
What's a Dual-Fuel System?
The best answer in cold climates is often both. A dual-fuel system pairs a heat pump with a gas furnace backup. The heat pump runs most of the heating season, when it's more efficient than gas. When the outdoor temperature drops below the crossover point (programmable on the thermostat), the system automatically switches to gas.
This captures the heat pump's efficiency for 80-90% of the heating hours in even cold climates, and the furnace's brute force for the coldest 10-20%. Installed cost runs roughly $7,000-$14,000 for a complete dual-fuel system, more than either technology alone but often the right economic answer over a 15-year lifespan.
What Does Installation Actually Cost?
- Gas furnace replacement (in existing ductwork): $2,500-$8,000 depending on efficiency tier
- Standard heat pump (mild climate): $4,500-$8,500
- Cold-climate heat pump (rated for below 0°F): $6,500-$12,000
- Dual-fuel system (heat pump + furnace backup): $7,000-$14,000
- Ductless mini-split (one zone): $3,500-$6,000 — doesn't use ductwork
Installation cost depends heavily on your existing infrastructure. If your furnace is failing and you already have ductwork and natural gas, a furnace replacement is the cheapest path. If you need new ductwork, a mini-split system might cost less than ducted heat pump or furnace because it skips the ductwork entirely.
What's the 2026 Rebate Landscape?
This is the year heat pump rebates got serious. The federal Inflation Reduction Act provides tax credits of up to $2,000 for a qualifying heat pump install, and the HEEHRA rebate program (rolling out through state energy offices) provides point-of-sale rebates of up to $8,000 for low- and moderate-income households. In 2026, most states have their HEEHRA programs live.
On top of federal programs, most utilities offer their own heat pump rebates — typically $300-$2,000 per installation. Some states (New York, Massachusetts, Vermont, Maine) add state-level rebates on top of that.
Stacked, a qualifying household can easily see $5,000-$10,000 off a heat pump installation in 2026. That changes the math significantly. A $9,000 cold-climate heat pump installation that nets to $3,500 after rebates is a very different economic proposition than a $3,000 furnace that has no rebates attached.
Check dsireusa.org for current programs in your state. Your contractor should also know the local utility rebates and often handles the paperwork.
Which Should You Pick?
Short version of my advice:
- Mild to moderate climate (rarely below 20°F): Heat pump. It'll heat and cool efficiently year-round and costs less to operate.
- Cold climate (regularly below 0°F): Dual-fuel system or a premium cold-climate heat pump, depending on your gas vs. electricity costs.
- Extreme cold climate (regular stretches below -20°F): Keep the furnace, add a heat pump for shoulder seasons if budget allows.
- No natural gas at your house: Heat pump, almost always. Propane is expensive, electric resistance is more expensive still, and a heat pump eliminates the fuel dependency entirely.
- Replacing a dying AC and also have an old furnace: Upgrade to a heat pump with furnace backup. The marginal cost is low and you future-proof the system.
The worst outcome I see is homeowners letting an HVAC contractor talk them into a like-for-like replacement without considering alternatives. If you have a 20-year-old gas furnace that died, don't just put in another 96% furnace. Get bids on a heat pump or dual-fuel system too. With current rebates, the numbers often favor the heat pump even in places where they wouldn't have five years ago.