Heat pumps use less energy than furnaces or air conditioners, but the actual amount depends on your climate, home size, and how cold it gets

A heat pump for an average home typically draws between 15 and 25 kilowatt-hours (kWh) per day during heating season, though this varies widely. In mild climates where temperatures rarely drop below freezing, you might use 10 to 15 kWh daily. In cold climates where outdoor temperatures stay below 30°F for weeks, consumption can climb to 30 to 40 kWh per day. The reason: heat pumps work by moving heat from outside air into your home, and the colder it gets outside, the harder the unit has to run to find and extract that heat.

Your actual bill depends on two things: how much energy the heat pump uses, and what your utility charges per kilowatt-hour. If you pay 14 cents per kWh and your heat pump uses 20 kWh per day for 120 heating days, that is roughly $336 for the season. If you pay 18 cents per kWh in the same scenario, it is $432. Regional electricity rates vary from about 10 cents per kWh in Louisiana to over 25 cents per kWh in Massachusetts, so two identical homes in different states will have very different heating costs.

Key Takeaways

  • Heat pumps typically use 15 to 25 kWh per day during heating season, with higher consumption in colder climates where outdoor temperatures stay below freezing.
  • A heat pump uses roughly 30 to 50 percent less energy than a traditional electric furnace or resistance heating system for the same home.
  • Your monthly heating bill depends on both the heat pump's energy use and your local electricity rate, which can range from 10 to 25 cents per kilowatt-hour.
  • Homes larger than 2,000 square feet, homes with poor insulation, and homes in regions with very cold winters will see higher energy consumption and bills.

How heat pump energy use compares to other heating systems

A heat pump is more efficient than electric resistance heating (baseboard heaters or electric furnaces) because it moves existing heat rather than generating it from scratch. An electric furnace that heats a 2,000-square-foot home might use 30 to 40 kWh per day in cold weather. The same home with a heat pump typically uses 15 to 25 kWh per day. That difference comes from the heat pump's coefficient of performance (COP), which measures how much heating output you get per unit of electricity input. Most air-source heat pumps have a COP of 2 to 3 in moderate cold, meaning they deliver 2 to 3 units of heat for every 1 unit of electricity consumed.

Heat pumps use more energy than natural gas furnaces in most climates because electricity is more expensive per unit of heat than gas. A gas furnace might cost $200 to $300 per season to heat the same home that costs $300 to $500 with a heat pump, depending on local gas and electricity prices. However, heat pumps have no gas line requirement, no combustion risk, and lower maintenance costs, which changes the overall economics over time.

What affects how much energy your heat pump will draw

The outdoor temperature is the single largest factor. Heat pumps become less efficient as it gets colder because there is less heat available in the outside air to extract. Most air-source heat pumps have a balance point — typically around 30°F to 40°F — below which they switch on a backup electric heating element to supplement the heat pump. Once that backup kicks in, energy consumption rises sharply. A heat pump running alone at 45°F might use 12 kWh per day; the same unit with backup heating running at 10°F might use 35 kWh per day.

Home size and insulation quality matter just as much. A well-insulated 1,500-square-foot home loses heat slowly and needs less energy to maintain 70°F. A poorly insulated 3,000-square-foot home with single-pane windows and gaps around doors loses heat quickly and demands much more. A home with R-19 attic insulation and air leaks will use 40 to 50 percent more energy than an identical home with R-38 attic insulation and sealed air leaks. Thermostat settings also shift consumption: every degree you lower the setpoint saves roughly 1 to 3 percent of heating energy.

The heat pump model itself affects efficiency. A high-efficiency unit with a Seasonal Energy Efficiency Ratio (SEER) of 18 or higher and a Heating Seasonal Performance Factor (HSPF) of 10 or higher will use less energy than an older unit with a SEER of 13 and HSPF of 7. The difference between a new and a 15-year-old heat pump can be 20 to 30 percent in energy consumption for the same heating output.

Estimating your heat pump energy bill

To estimate your seasonal heating cost, you need three numbers: your heat pump's average daily kWh use, your local electricity rate, and the length of your heating season. Start by checking your utility bill for your average rate per kilowatt-hour — this is usually listed as "average price per kWh" or similar. Then estimate your heating season length: in the northern United States, heating season typically runs from October or November through March or April, roughly 120 to 180 days depending on your location.

If your heat pump uses 18 kWh per day, your rate is 15 cents per kWh, and your heating season is 150 days, your estimated cost is 18 × 0.15 × 150 = $405 for the season. This is a rough estimate because energy use is not constant — you will use more on the coldest days and less on mild days. A better approach is to ask your heat pump installer for an energy estimate based on your specific home, location, and equipment model. Many installers use software that factors in your home's square footage, insulation level, air leakage, and local weather data to predict seasonal consumption.

How to reduce heat pump energy consumption

Sealing air leaks is the fastest payoff. Caulk gaps around windows and doors, seal penetrations where pipes and wires enter the home, and check weatherstripping on exterior doors. Air leaks account for 15 to 30 percent of heating loss in many homes, and sealing them costs little and requires no special tools. You can feel drafts with your hand on a cold day, or use a smoke stick to watch air movement around frames and seams.

Adding insulation to the attic is the next priority. Most homes lose 25 to 35 percent of heating energy through the roof. If your attic has less than R-30 insulation, adding more pays for itself in 3 to 7 years through lower heating bills. Blown-in cellulose or fiberglass is inexpensive and can be installed in a day. Lowering your thermostat by 2 to 3 degrees at night or when you are away saves 5 to 10 percent of heating energy with no capital cost — a programmable or smart thermostat makes this automatic.

Keeping your heat pump clean and well-maintained also matters. A dirty outdoor unit works harder and uses more energy. Clear leaves and debris from around the outdoor condenser, and have the system serviced annually by a technician who will check refrigerant charge, clean coils, and inspect electrical connections. A heat pump that is low on refrigerant or has a clogged filter can use 10 to 20 percent more energy than one in good condition.

Regional differences in heat pump energy use and cost

Climate zone determines how long your heating season lasts and how cold it gets. In the Pacific Northwest and coastal California, heating seasons are short and temperatures rarely drop below 20°F, so heat pumps run efficiently and use less total energy. A home in Portland, Oregon might use 12 to 18 kWh per day for heating. The same home in Minneapolis, Minnesota might use 25 to 35 kWh per day because the heating season is longer and colder. In the Deep South, heating is minimal — a home in New Orleans might use only 5 to 10 kWh per day for heating, though cooling costs in summer are high.

Electricity rates also vary by region and utility. The Pacific Northwest has low rates (10 to 12 cents per kWh) because of hydroelectric power. The Northeast has high rates (18 to 25 cents per kWh) because of reliance on natural gas and oil generation. The Midwest is moderate (12 to 16 cents per kWh). This means a heat pump in Vermont might cost twice as much to operate as the same unit in Washington state, even if both homes use similar amounts of energy, because Vermont's electricity is more expensive.

Frequently Asked Questions

Do heat pumps use a lot of electricity?

Heat pumps use less electricity than electric furnaces or baseboard heaters for the same heating output, but more than natural gas furnaces. A typical heat pump uses 15 to 25 kWh per day during heating season, compared to 30 to 40 kWh for an electric furnace. Whether that is "a lot" depends on your electricity rate and what you are comparing it to.

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

Possibly, depending on your local electricity and gas prices. In regions where gas is cheap and electricity is expensive, a heat pump may cost more per month to operate than a gas furnace. In regions where electricity is cheap or gas is expensive, a heat pump may cost less. Ask your utility for average heating costs under both systems for your area.

Why does my heat pump use more energy on very cold days?

On very cold days, the outdoor air contains less heat for the heat pump to extract, so the unit runs longer and works harder. Below the balance point (usually 30°F to 40°F), a backup electric heating element turns on, which uses much more energy than the heat pump alone. This is normal and expected.

Can I reduce heat pump energy use by adjusting the thermostat?

Yes. Lowering your setpoint by 2 to 3 degrees saves 5 to 10 percent of heating energy. Using a programmable thermostat to lower the temperature at night or when you are away amplifies the savings. However, setting the thermostat very low and then raising it quickly does not save energy because the backup heating element turns on and uses more power.

How much does it cost to run a heat pump for a month?

It depends on your climate, home size, electricity rate, and how cold it is. In a moderate climate with a 15-cent-per-kWh rate and 20 kWh per day use, expect roughly $90 per month during heating season. In a cold climate with a 18-cent-per-kWh rate and 30 kWh per day use, expect roughly $160 per month. Ask your installer for an estimate based on your specific situation.