Quick answer
Heat pumps can be up to three times more energy efficient than gas furnaces, so they're a compelling choice if you're looking to cut utility bills 1. They work by moving heat rather than generating it, so you get more heating or cooling for every dollar you spend on electricity. In 2024, heat pumps outsold gas furnaces in the U.S. for the first time, with over 5 million units sold — a sign that more homeowners are making the switch 2.
How it works
A typical air source heat pump system consists of an outdoor unit (coil and fan) and an indoor air handler unit 3. The outdoor coil acts as the condenser in cooling mode and the evaporator in heating mode, while the indoor coil does the opposite. In summer, the system pulls heat from inside your home and dumps it outside. In winter, it reverses—extracting heat from outdoor air and bringing it inside. That’s possible because even cold air contains some heat energy, and the refrigerant cycle can concentrate it. A reversing valve flips the flow of refrigerant, so the same equipment provides both heating and cooling.
When this matters for you
If you live where winters dip below freezing, a heat pump’s cold-weather performance isn’t a spec-sheet detail—it’s what decides whether you’ll be comfortable in January. Modern cold-climate units have pushed the envelope: some heat pumps are rated for temperatures as low as -20°F, but efficiency drops in extreme cold 4. That means a system sized for 30°F might struggle to keep up during a deep freeze, even if it technically still runs.
You’ll want to pay closest attention to this if your home currently relies on electric resistance heat, fuel oil, or propane. In milder climates, a standard heat pump can slash your heating bill. In colder zones, a cold-climate model—or a dual-fuel setup that pairs a heat pump with a gas furnace for the coldest days—often makes more sense. Your local climate data and utility rates are the real decision drivers here, not the marketing claims.
Pros of heat pumps
Heat pumps have become the dominant choice for home heating, with manufacturers shipping 3.6 million units in 2025 compared to 3.2 million gas furnaces 5. That shift isn't just about trends — it's driven by real performance gains. Trane's top-tier model now reaches up to 22.4 SEER2 and 10.5 HSPF2, squeezing more heat out of every watt even when temperatures drop 6.
Cons of heat pumps
Heat pumps aren't perfect for every home. If your winters drop below freezing regularly, a standard air-source heat pump can struggle to pull enough warmth from the outside air. You'll notice the system running longer, and it may rely on a backup electric resistance heater that jacks up your utility bill. Cold-climate models have improved, but in sustained sub-zero temperatures, a gas furnace still delivers more consistent heat 3.
Upfront cost is the other big hurdle. A ducted heat pump system often runs $3,000–$8,000 more than a comparable AC-and-furnace combo, depending on the model and your home's layout 2. If you need to upgrade your electrical panel or add ductwork, the price climbs further. While the long-term energy savings can offset that, the initial check is hard to swallow.
Heat pumps also move heat more slowly than a gas furnace. The air coming out of your vents will feel warm, not hot — usually 85°F to 95°F, compared to 120°F or more from a furnace. That's fine for maintaining a steady temperature, but if you're used to a quick blast of heat on a cold morning, you'll need to adjust your expectations.
Noise can be a factor, too. The outdoor unit runs year-round, and while modern inverter-driven compressors are quieter, you'll still hear a hum when you're near it. Placement matters — tuck it away from bedroom windows if you can.
Finally, heat pumps need more maintenance than a furnace. You'll clean or replace filters more often, and the outdoor coil needs to stay clear of leaves, snow, and ice. In freezing weather, the unit will go into defrost mode, which can produce a puff of steam that looks alarming but is normal. Still, if the defrost cycle fails, ice can build up and damage the coil.
⚠️ Warning: If your heat pump's outdoor unit is buried in snow or ice, don't chip at it with a shovel. You can easily puncture the coil. Use a soft broom or let the defrost cycle do its job — and make sure the unit is elevated on a stand in snowy regions.
Components and variations
A typical air source heat pump system has an outdoor unit with a coil and fan, and an indoor air handler 3. In cooling mode, the outdoor coil is the condenser and the indoor coil is the evaporator. In heating mode, they swap roles. The fan moves air across the coils to transfer heat, and the air handler circulates conditioned air through your ductwork.
Standards and codes
Heat pumps have to meet minimum efficiency levels set by national standards. For split-system heat pumps, the current national minimum is 14.3 SEER2 (15 SEER) for cooling and 7.5 HSPF2 (8.8 HSPF) for heating 7. These numbers keep creeping up as efficiency requirements tighten.
Commercial buildings face stricter rules under ASHRAE 90.1, which sets minimum energy efficiency requirements for HVAC systems and other building components 8. Local codes can add their own layers. Seattle's energy code, for example, requires 1″ insulation on outdoor suction lines and 1/2″ on indoor suction lines for commercial installations 9. That's more than many installers would do by default, so it's worth checking your local amendments.
Plumbing codes also come into play when heat pump water heaters or hydronic systems are involved. If pipes run through unheated spaces, they must be protected from freezing — typically with insulation, heat trace, or both 10. A burst pipe from a cold snap isn't something you want to discover after the fact.
Before you buy, ask your contractor which codes apply in your area and whether the equipment meets or exceeds them. A unit that squeaks by on minimums today might feel outdated in a few years, especially as standards continue to rise.
Frequently Asked Questions
How long does a heat pump last? With proper maintenance, a well-installed heat pump typically lasts 15 to 20 years. Some units keep running beyond 20 years, though efficiency may drop as components age. Regular filter changes and annual professional checkups help you get the most years out of your system.
What does a heat pump cost? Installing a whole-house heat pump usually runs between $4,000 and $8,000, but that range can climb higher for cold-climate models or homes needing ductwork modifications. The final price depends on your home’s size, the unit’s efficiency rating, and local labor rates. Don’t forget to check for utility rebates and federal tax credits—they can knock thousands off the upfront cost.
Can a heat pump work with my existing furnace or ductwork? Yes, in many cases. If you already have forced-air ducts, a heat pump can often connect to them. For homes with a furnace, a dual-fuel setup pairs a heat pump with a gas or oil furnace: the heat pump handles milder weather, and the furnace kicks in when temperatures drop. A qualified HVAC contractor can tell you if your current ducts are sized right and sealed well enough for a heat pump.
Do heat pumps work in really cold climates? Modern cold-climate heat pumps deliver heat efficiently even when outdoor temperatures fall below 0°F. They’re designed with enhanced compressors and refrigerants that maintain capacity in freezing weather. In extreme cold snaps, a backup heating element or dual-fuel system provides extra warmth, but for most winter days, the heat pump alone does the job.
Are heat pumps noisy? Today’s heat pumps are much quieter than older models. The outdoor unit typically hums at 50 to 60 decibels—about the level of a normal conversation. Indoor units are even quieter. If noise is a concern, look for models with sound ratings below 55 dB and place the outdoor unit away from bedroom windows.
How much maintenance does a heat pump need? Heat pumps need about the same care as a central air conditioner. You’ll want to clean or replace the air filter every one to three months, keep the outdoor unit clear of leaves and debris, and have a professional inspect the system once a year. That annual tune-up checks refrigerant levels, electrical connections, and coil cleanliness to keep everything running smoothly.
Will a heat pump lower my energy bills? For many homeowners, yes—especially if you’re switching from electric resistance heat, oil, or propane. Heat pumps move heat rather than generate it, so they can be two to three times more efficient than traditional electric heating. Your actual savings depend on local energy prices, your home’s insulation, and the system you’re replacing. In areas with high electricity rates, the savings may be smaller, but pairing a heat pump with solar panels can dramatically cut costs.
Can I install a heat pump myself? Installing a heat pump isn’t a DIY project. It involves refrigerant handling, electrical wiring, and precise sizing—all of which require licensed professionals. A botched installation can lead to poor efficiency, frequent breakdowns, and even safety hazards. Always hire a qualified HVAC contractor for the job.