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Do Heat Pumps Use a Lot of Electricity?

Yes, heat pumps do use a lot of electricity but that may not be a bad thing.
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One of the most common questions we get asked is: “Do heat pumps use a lot of electricity?” To make it short, yes, but there’s a lot of nuance and factors, and most often, it’s still a net benefit on your utility bills. Let’s break it down:

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How heat pumps operate

Unlike a conventional gas furnace that burns fuel to produce heat, a heat pump uses a refrigeration cycle to pull heat from outdoor air (air-source) or the ground (geothermal) and move it indoors. Because it only needs electricity to run the compressor and fans rather than produce heat from scratch, it often consumes fewer total resources.

What affects a heat pump's energy use?

  • Efficiency Ratings: A heat pump’s Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF) are key indicators. Higher ratings mean lower energy use.
  • Climate: Colorado’s cold winters demand cold-climate heat pumps with variable-speed compressors to maintain efficiency.
  • Home Insulation: Poorly insulated homes increase heat pump workload.
  • Size of the System: Oversized or undersized systems waste energy.
  • Usage Patterns: Frequent adjustments to thermostat settings can spike energy use.

According to the 2021 International Energy Conservation Code (IECC), proper insulation, airtight construction, and efficient systems can dramatically reduce heat pump energy consumption.

Climate Zone Map from IECC 2021
Climate Zone Map from IECC 2021

Heat pump electricity usage

Heat pumps are often compared to conventional heating and cooling systems such as gas furnaces, electric resistance heaters, and air conditioners. Below is a comparison of their energy use for both heating and cooling modes:

Heating mode energy use
Cooling mode energy use
What do these metrics mean?
  • HSPF (Heating Seasonal Performance Factor): Measures heating efficiency for heat pumps. Higher HSPF means less electricity used for the same heat output.
  • sCOP (Seasonal Coefficient of Performance): Ratio of heat output to electricity input over a season. Similar to HSPF but used internationally.
  • AFUE (Annual Fuel Utilization Efficiency): Efficiency of gas furnaces. 0.95 AFUE means 95% of energy in natural gas is converted to heat.
  • SEER (Seasonal Energy Efficiency Ratio): Measures cooling efficiency for air conditioners and heat pumps. Higher SEER means more cooling per kWh of electricity.

Energy use per square foot

Heat pump electricity use varies by home size and system efficiency. Compared to gas furnaces and boilers, heat pumps excel in efficiency but may cost more to operate if electricity prices are high. Here is a comparison:

Heat pumps generally consume less total energy but may cost more due to electricity’s price compared to natural gas.

How much will it cost to run a heat pump?

Cost depends on electricity rates, system efficiency, and usage patterns. Heat pumps with higher COP or HSPF ratings use significantly less total energy but may cost more to operate due to the difference in energy density. Here is an example for a 2,000 square foot home in Colorado across different temperature bands:

With most cold climate heat pumps, at temperatures above 50°F, COP often exceeds 4.0, which significantly reduces operating costs.

How many watts does a heat pump use?

Heat pump wattage depends on system type and usage. For example:

How to calculate wattage for a heat pump
  1. Determine Your Therms for Heating: Calculate how many therms you typically use for heating annually. This data can often be found on past utility bills.
  2. Convert Therms to kWh: Multiply the therms by 29.3 (1 therm = 29.3 kWh). For example, 670 therms for a gas furnace converts to approximately 19,631 kWh.
  3. Adjust for Heat Pump Efficiency: Divide the converted kWh by the heat pump’s COP to account for its greater efficiency. For example, if a heat pump has a COP of 3.0, the adjusted usage is 6,544 kWh (19,631 / 3.0).
  4. Estimate Energy Use Per Hour: Divide the annual kWh by the estimated hours of heating use annually. For example, if heating runs 2,500 hours a year, the system would use approximately 2.62 kW (6,544 / 2,500).

Will heat pumps increase my bills?

Heat pumps do not typically increase your bills overall, but they convert natural gas heating costs to electricity costs. This shift can be advantageous or costly depending on electricity prices, usage patterns or solar offset. For example:

  • In Colorado’s moderate winter temperatures, a heat pump operating at COP 3.0 can reduce energy use by 30% compared to a gas furnace.
  • In extremely cold temperatures, all heat pumps will have high run-times at high ampacity, which tends to increase costs, as a unit of electricity is much less energy dense compared to a unit of natural gas.
  • Dual fuel cold climate heat pumps are a great fit for homeowners who want the best of both worlds; dual fuel systems combine a gas furnace and a heat pump to allow the homeowner to choose how much of the heating is taken on by the heat pump.
Do heat pumps raise your electric bill?

Yes, but they can lower overall energy costs by replacing gas, oil, or electric resistance heating. In Colorado, a high-efficiency heat pump can reduce heating costs by up to 30%.

Why does my heat pump use so much electricity?

Heat pumps can only use electricity to transfer heat, so their usage reflects that dependency. However, high electricity use can be exaggerated by:

  • Cold temperatures: High run times and defrosting cycles can cause high use.
  • Poor insulation: Heat loss forces the system to work harder.
  • Old or inefficient unit: Modern models are far more efficient.
How much does it cost to run a heat pump per day?

Costs vary with temperature and efficiency:

  • Cold days: ~$4.20 (30 kWh @ $0.14/kWh).
  • Milder days: ~$2.10-$2.80 (15-20 kWh).
What is the downside to a heat pump?
  • Higher operating costs in extreme cold: Efficiency drops and unit may have high run time.
  • Higher upfront cost: Installation is expensive but often offset by incentives.
  • Complicated installation: Proper sizing and setup require a skilled contractor.

Conclusion

Heat pumps offer a significant net benefit for homeowners. They can lower energy costs, reduce reliance on fossil fuels, and provide efficient heating and cooling year-round. For added flexibility, they can be paired with dual fuel setups to optimize performance in extreme cold. Plus, there are significant rebates available for residents of Denver, Littleton, Centennial, and surrounding areas to make installation more affordable.

If you’re considering a heat pump for your home, contact UniColorado for expert advice and professional installation. We’re here to help you find the best solution for your comfort and budget.

  • How heat pumps operate
  • Factors affecting energy use
  • Conventional vs heat pump
  • Energy use per sqft
  • Cost to operate
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