A heat pump typically costs about $0.25-$0.80 per hour to run, with a common average near $0.45-$0.60 when electricity costs 15 cents per kilowatt-hour. The heat pump cost per hour depends mainly on its electrical draw, local utility rate, outdoor temperature, system efficiency, and whether electric backup heat is running.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Heat pump electricity per hour | $0.25 | $0.50 | $0.80 | Typical compressor operation at common residential rates |
| Electricity rate | $0.10/kWh | $0.15/kWh | $0.25/kWh | Local utility price changes the bill directly |
| Resistance backup heat per hour | $0.65 | $1.50 | $3.75 | Depends on strip-heater size and rate |
| Monthly heating estimate | $90 | $180 | $400 | Illustration for 6-8 hours of equivalent daily operation |
What a heat pump costs for each running hour
For a typical 2- to 4-ton air-source system, compressor and indoor-fan operation often uses about 2-4 kilowatt-hours (kWh) in an hour. At $0.15 per kWh, that works out to roughly $0.30-$0.60 per hour. A high-efficiency system in mild weather may use less; a larger unit working hard in cold weather may use more.
Across common U.S. utility rates of $0.10-$0.25 per kWh, ordinary operation can range from about $0.20 to $1.00 per hour. The national-style average in the table assumes the system is heating steadily, without substantial resistance heat. Actual run time varies: a thermostat cycle may operate the compressor for only part of an hour.
For a practical starting estimate, budget about $0.50 per compressor-running hour at $0.15 per kWh. This is an operating estimate, not the installed cost of buying or replacing equipment. It also excludes unrelated household electricity use and fixed utility charges.
Assumptions: 2- to 4-ton residential air-source heat pump, compressor operation, ordinary ductwork, and no major electric resistance backup use.
How electricity use and utility rates shape the bill
The basic calculation is electrical input in kW multiplied by the electricity price per kWh. For example, a unit drawing 3 kW at $0.17 per kWh costs about $0.51 for one hour of operation. The heat pump’s output capacity, often listed in BTU per hour, is not the same as its electrical input.
For variable-speed systems, consumption changes with the compressor speed and heating demand. A unit may draw 1-2 kW while maintaining temperature in mild weather, then rise to 3-5 kW during a cold start. The indoor blower also uses electricity, commonly adding a small amount compared with the compressor.
Every additional 1 kW of draw adds $0.15 per running hour at a 15-cent electricity rate. If the home uses time-of-use pricing, the same equipment can cost more during peak hours and less overnight, even when its energy use is unchanged.
| Operating component | Typical draw | Cost at $0.15/kWh | Cost at $0.25/kWh |
|---|---|---|---|
| Compressor and fan, mild load | 1-2 kW | $0.15-$0.30/hour | $0.25-$0.50/hour |
| Compressor and fan, normal load | 2-4 kW | $0.30-$0.60/hour | $0.50-$1.00/hour |
| 5 kW resistance strip | 5 kW | $0.75/hour | $1.25/hour |
| 10 kW resistance strip | 10 kW | $1.50/hour | $2.50/hour |
Why tonnage, outdoor temperature, and backup heat matter
Capacity is one important driver, but larger equipment does not always cost proportionally more each hour. A properly sized 3-ton unit may draw less than an undersized 2-ton system that runs continuously. Manufacturers’ labels and technical specifications can provide input power at particular conditions; performance changes as outdoor temperatures and indoor heating needs change.
Cold weather can reduce a heat pump’s heating capacity and efficiency. Around 35°F, many systems operate more efficiently than they do near 10°F, though the exact difference depends on model and installation. When the thermostat calls for auxiliary resistance heat, electricity use can jump sharply. A 5- to 15-kW strip heater costs $0.75-$2.25 per hour at $0.15 per kWh, before any simultaneous compressor use.
Other thresholds matter as well. A 2-ton system is nominally about 24,000 BTU per hour, while a 4-ton system is about 48,000 BTU per hour; these figures describe heating or cooling capacity, not power consumption. Poor insulation, leaky ducts, a dirty filter, or a thermostat setback of several degrees can increase runtime and raise hourly or daily spending.
Backup heat is often the largest reason a heat pump’s hourly cost suddenly rises. Check the thermostat for an “auxiliary” or “emergency heat” indicator and review the equipment data plate or installer paperwork for the strip-heater capacity. Emergency heat may disable normal heat-pump operation and can be substantially more expensive per hour.
Three household examples with hourly and monthly estimates
These examples use a blended rate of $0.15 per kWh and show approximate costs during heating operation. Monthly totals assume 30 days and the stated average operating hours per day; they are not guaranteed bills. Real systems cycle, modulate, and respond to changing weather, so a simple hourly estimate is best used for comparison rather than as a precise forecast.
| Home and equipment scenario | Average input | Hourly estimate | Monthly estimate |
|---|---|---|---|
| Small, well-insulated home; 2-ton unit; 5 hours/day | 1.8 kW | $0.27/hour | $41/month |
| Typical home; 3-ton unit; 8 hours/day | 3.0 kW | $0.45/hour | $108/month |
| Large or drafty home; 4-ton unit; 10 hours/day | 4.5 kW | $0.68/hour | $203/month |
The first example represents modest demand and steady conditions, not a guarantee that a heat pump will run only five hours every winter day. The middle example is a useful planning case for an average home, but cold snaps can push it higher. The larger-home example assumes higher electrical input and longer operation, without adding resistance backup heat.
Monthly spending is driven by both the hourly rate and the number of hours the system operates. To estimate a specific bill, multiply measured kWh use by the utility’s actual energy rate. A smart meter, utility portal, or circuit-level energy monitor can provide a better input figure than a general equipment-size estimate.
Regional electricity prices change the same system’s hourly cost
Electricity prices vary widely by state, utility, and plan. A heat pump using 3 kW per hour costs $0.30 at a $0.10 rate, $0.45 at $0.15, and $0.75 at $0.25. That is a 150% difference between the low and high examples, even though the equipment and operating conditions are identical.
Rates around $0.10-$0.14 per kWh are found in some lower-cost areas and plans; many households pay about $0.15-$0.22; and some high-cost markets or peak periods can exceed $0.25. These are planning ranges, not regional guarantees. The relevant figure is the marginal price for an additional kWh, which can differ from the average bill divided by total usage because of fixed fees, tiers, and time-of-use charges.
Climate affects the amount of energy used, while the utility rate determines the price of each unit. A cold region may require more runtime and backup heat, even if its electricity rate is moderate. Conversely, a mild climate may reduce heating demand, but high local rates can still produce a noticeable bill.
Use the rate on the current utility plan rather than a national average when estimating an hourly cost. For a time-of-use plan, calculate separate estimates for peak and off-peak periods. A 3-kW system operating at 30 cents per kWh during peak hours costs $0.90 per hour, compared with $0.36 at 12 cents off-peak.
Runtime, maintenance, and repair charges beyond electricity
Hourly operating cost is not the only expense. A service call commonly costs about $75-$150 for diagnosis, while repairs can range from roughly $150-$600 for common electrical or airflow problems to $600-$2,000 or more for major components. Local rates, parts, access, and warranty coverage affect the final invoice.
Routine maintenance is often priced at $100-$250 per visit, depending on the region and whether the contractor checks both heating and cooling functions. Replacing a standard filter may cost $5-$30 if done by the homeowner, while higher-grade or custom filters cost more. Clean filters, clear outdoor coils, and unobstructed airflow help avoid unnecessary strain, but maintenance does not eliminate weather-related energy use.
Labor rates commonly fall around $75-$150 per technician-hour, with higher charges possible for emergency visits, weekends, or remote locations. A diagnostic fee may be credited toward a repair, but that policy should be confirmed before authorizing work. Heat pump replacement is a separate capital expense and can run roughly $6,000-$15,000 installed for many central systems, with ductwork, electrical upgrades, and premium equipment pushing totals higher.
Compare the annual service and repair budget separately from the electricity cost per hour. A system with low hourly use can still need an expensive repair, while an older unit may consume more power because it runs longer or relies on backup heat. Warranty terms and the age of the compressor are relevant when deciding whether a repair is worthwhile.
Heat pump versus resistance heat and gas costs
Electric resistance heat converts electricity directly to heat, so a 10-kW heater at $0.15 per kWh costs $1.50 per hour. A heat pump delivering comparable heating can often provide two to four units of heat for each unit of electricity under suitable conditions, though performance varies with temperature and equipment. That efficiency advantage usually makes compressor operation cheaper than resistance heat.
Gas furnaces use a different fuel and are better compared by cost per unit of delivered heat rather than by hourly use alone. A gas furnace’s hourly fuel expense depends on its input rating, efficiency, and the price per therm; the blower also draws electricity. In areas with inexpensive natural gas and costly electricity, a furnace can be competitive during the coldest hours, while a heat pump may cost less in milder weather.
Hybrid systems can switch between a heat pump and a furnace based on outdoor temperature or utility prices. The economic changeover point depends on the equipment efficiency and local gas and electricity rates. A contractor can calculate that threshold using the actual system ratings and fuel tariffs instead of assuming one heating source is always cheaper.
Compare the cost of producing the same amount of heat, not just the hourly price of each appliance. Backup resistance heat is generally the least economical option at high electric rates, but its use may be limited to short periods or included for defrost and extreme cold. Avoid disabling required safety or defrost functions to reduce the bill.
Ways to lower heat pump cost per hour without sacrificing comfort
Start by checking the thermostat schedule and auxiliary-heat settings. Large temperature setbacks followed by rapid recovery can trigger resistance heat on some systems; a steadier setting may reduce that risk. Settings vary by thermostat and equipment, so an installer’s guidance is preferable to changing advanced controls without checking the manual.
Improve the conditions the system has to heat. Seal obvious drafts, keep supply and return vents open, replace a clogged filter, and maintain clear space around the outdoor unit. These modest steps can support normal airflow and reduce avoidable runtime. Air sealing or insulation upgrades may cost hundreds to several thousand dollars, but their value depends on the home’s existing condition and climate.
When comparing utility plans, calculate the effect of peak rates on the heat pump’s likely schedule. A rate plan with cheaper overnight power may help if the home can maintain temperature without using costly backup heat later. Do not assume that a lower advertised energy rate offsets monthly fees or peak charges; compare the total bill under realistic usage.
The most controllable savings usually come from reducing unnecessary runtime and preventing resistance heat from operating longer than needed. If bills rise suddenly, check the kWh trend, thermostat display, filter, and outdoor unit before assuming the system itself is inefficient. A technician can test refrigerant charge, airflow, controls, and backup-heat staging when simple checks do not explain the increase.