Heat pumps use less electricity than furnaces or air conditioners, but the amount varies by climate, home size, and how cold it gets outside

A heat pump typically draws 15 to 25 amps at full operation, which translates to roughly 3,600 to 5,400 watts while running. That sounds high until you compare it to what you're replacing: a gas furnace uses less power per cycle, but a heat pump moves heat instead of generating it, so it delivers more warmth per unit of electricity consumed. In moderate climates, a heat pump can cut heating costs by 30 to 50 percent compared to electric resistance heating. In very cold climates—below 25°F regularly—efficiency drops because the system has to work harder to extract heat from cold air, and many heat pumps switch to backup electric resistance heating, which uses significantly more power.

Your actual monthly bill depends on how often the heat pump runs, which depends on outdoor temperature, your thermostat setting, and how well your home is insulated. A heat pump in a mild climate might run a few hours per day in winter. The same unit in a cold climate might run 8 to 12 hours daily or continuously on the coldest days. The system's seasonal efficiency rating—called the Heating Seasonal Performance Factor (HSPF)—tells you how many units of heat you get per unit of electricity over a whole season. Higher HSPF numbers mean lower electricity use.

Key Takeaways

  • Heat pumps draw 3,600 to 5,400 watts while actively heating, but they run intermittently, not constantly, so monthly usage depends on outdoor temperature and home size.
  • A heat pump's efficiency drops significantly below 25°F, and many systems switch to backup electric resistance heating in very cold weather, which uses much more power.
  • Comparing electricity use to a gas furnace is misleading because furnaces use less power per cycle but deliver less total heat; heat pumps are most efficient against electric resistance heating or air conditioning.
  • An HSPF rating of 8 or higher indicates a modern, efficient heat pump; older units or those in cold climates may have lower ratings and higher electricity consumption.
  • Insulation, air sealing, and thermostat settings have as much impact on your bill as the heat pump itself—a poorly sealed home will drive up electricity use regardless of equipment efficiency.

Why heat pump electricity use is hard to predict

The wattage a heat pump draws is only half the story. What matters for your electric bill is how long it runs, and that depends on factors you can't control (outdoor temperature) and factors you can (thermostat setting, home insulation). A heat pump in Phoenix running 2 hours per day in winter uses far less monthly electricity than the same model in Minneapolis running 10 hours per day. Neither number is "wrong"—they're just different climates.

The system also cycles on and off. It doesn't run at full 5,400 watts for eight straight hours; it runs for 15 minutes, shuts off when the house reaches the set temperature, then cycles back on when temperature drops. Variable-speed compressors (found in newer, more expensive units) ramp up and down rather than cycling on and off, which can reduce electricity use by 10 to 15 percent compared to single-speed models. The difference shows up most in mild weather, when the system doesn't need to run at full capacity.

How cold weather changes electricity consumption

Below 32°F, a heat pump becomes less efficient because there's less heat in the outdoor air to extract. At 25°F, a typical air-source heat pump delivers only about 75 percent of the heating capacity it provides at 47°F. Below 0°F, that drops to 50 percent or less. To make up the difference and keep your house warm, the system either runs longer or switches to backup electric resistance heating—essentially a space heater built into the system.

Backup resistance heating is a major electricity consumer. When it kicks in, you're no longer getting the efficiency advantage of a heat pump; you're using straight electric heating, which costs roughly twice as much per BTU as the heat pump alone. Many heat pumps are set to switch to backup heat automatically when outdoor temperature drops below a certain threshold (often 25°F to 35°F, depending on the model). If you live where temperatures regularly fall below 20°F, ask your installer what the switchover temperature is and whether you can adjust it—running the heat pump alone longer, even at lower efficiency, is often cheaper than flipping to backup heat.

Comparing heat pump electricity use to other heating systems

A gas furnace uses 300 to 600 watts to run the blower and controls, but the gas itself heats your home—and you pay for that on your gas bill, not your electric bill. A heat pump uses 3,600 to 5,400 watts but delivers more total heat per unit of energy input because it moves heat rather than creating it. The comparison that matters is cost per BTU delivered, not raw wattage.

Against electric resistance heating (baseboard heaters, old electric furnaces), a heat pump is dramatically more efficient. Resistance heating converts electricity directly to heat at roughly 100 percent efficiency, but that's the worst-case scenario for cost because electricity is expensive. A heat pump with an HSPF of 8 delivers roughly twice as much heat per kilowatt-hour as resistance heating. Against air conditioning, a heat pump uses similar electricity in summer (when cooling) and less in winter (when heating efficiently) compared to running a separate AC unit plus a furnace.

What HSPF and SEER ratings tell you about electricity use

The HSPF (Heating Seasonal Performance Factor) rating estimates how many BTUs of heat a heat pump delivers per watt-hour of electricity over a whole heating season. An HSPF of 8 means the unit delivers 8 BTUs for every watt-hour used. An HSPF of 10 or higher is very efficient; an HSPF of 6 or lower is older or less efficient equipment. The higher the HSPF, the lower your heating electricity use will be, all else equal.

The SEER rating measures cooling efficiency the same way. A heat pump with SEER 16 and HSPF 10 is more efficient in both directions than one with SEER 13 and HSPF 8. However, HSPF and SEER are seasonal averages. They don't account for your specific climate or how cold it actually gets where you live. A unit with HSPF 10 in Minnesota will use more electricity than the same unit in North Carolina because it runs longer and works harder in colder weather.

How to reduce heat pump electricity use

Lowering your thermostat by 7°F for 8 hours per day can cut heating electricity use by 10 to 15 percent. A programmable or smart thermostat makes this automatic. Setting the thermostat to 68°F instead of 72°F saves noticeably on the bill without most people noticing the difference, especially if you're wearing a sweater.

Sealing air leaks and adding insulation reduces how hard the heat pump has to work. Caulking around windows and doors, sealing gaps where pipes enter the house, and insulating the attic to R-38 or higher can cut heating load by 15 to 30 percent. These improvements benefit any heating system, but they have the biggest payoff with a heat pump because the system is already efficient—you're not wasting money on a poorly insulated home.

Keeping the outdoor unit clear of snow, ice, and debris helps the system run more efficiently. A blocked condenser coil forces the compressor to work harder and use more electricity. In winter, clear snow away from the outdoor unit after storms. In fall, keep leaves and branches away from the intake and exhaust.

Frequently Asked Questions

Will my electric bill go up if I switch from gas heat to a heat pump?

Not necessarily. A heat pump uses more electricity than a gas furnace uses electricity, but you're no longer paying for gas. The total cost usually drops 20 to 40 percent depending on local gas and electricity prices. In areas where electricity is very cheap and gas is expensive, the savings are larger. If electricity is expensive where you live, the savings are smaller but usually still positive.

Does a heat pump use more electricity in winter or summer?

It depends on your climate. In mild climates, heating in winter uses less electricity than cooling in summer because the heat pump is more efficient at moving heat than at moving cold. In very cold climates, winter electricity use can exceed summer use because the system runs longer and may use backup resistance heating. In moderate climates, they're roughly equal.

What's the difference between a heat pump and a mini-split system in terms of electricity use?

A mini-split is a type of heat pump, so electricity use is similar. Mini-splits are often more efficient than traditional central heat pumps because they have less ductwork and can heat individual rooms separately. They typically have HSPF ratings of 9 to 12, compared to 8 to 10 for central systems. The actual electricity bill depends on how you use them—if you heat only occupied rooms, you'll use less electricity than heating a whole house.

Can I run a heat pump on a standard 200-amp home electrical panel?

Most heat pumps can run on a standard 200-amp service, but the installation requires a dedicated 40 to 60-amp circuit. If your panel is already at capacity with other major appliances, you may need to upgrade. An electrician can assess your panel during the installation quote and tell you whether an upgrade is necessary.

Does a heat pump use electricity when it's not heating?

Yes, but very little. The outdoor fan and controls draw a small amount of power even when the compressor is off. This standby draw is typically 50 to 200 watts and is negligible on your monthly bill. The real electricity use comes when the compressor is running and actively heating or cooling.