How Does a Heat Pump Work in the Winter?

By Sarah Stasik

October 29, 2025

Keeping your home comfortable year-round involves routine maintenance of your heating, ventilation and air conditioning (HVAC) system and understanding its limitations. If you've purchased a home with a heat pump or you're researching upgrade options for your home, you might wonder how heat pumps work and if they're effective during cold months.

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Heat pumps work by extracting heat from the air. In the summer, a heat pump moves warm air from inside your home to the outside to help keep your space cool. In the winter, it moves warm air from outside to help heat your space. That may seem confusing, and you may wonder how a heat pump works in winter when outside air is cold.

Will Your Heat Pump Work This Winter?

Whether your particular heat pump is ready for winter operation depends heavily on its age and how well it's maintained. Factors that impact whether your heat pump works in the cooler months can include:

Quality of installation. Proper installation is critical to optimal performance for any major home appliance. When you're choosing HVAC components for a new-construction home or upgrading your existing system, work with a qualified HVAC service contractor. They can ensure your unit is well-installed to support heating and cooling throughout the year.

How well the unit is maintained. Maintenance is also essential to long-term functionality. If you think your unit is struggling or notice it can't keep up with outside temperatures, call in a qualified repair person for heat pump troubleshooting for the winter. It's also a good idea to invest in routine maintenance before major season changes to ensure your heat pump is ready to support a cozy environment in your home through the colder months.

Whether you have the right model. Not all heat pumps are created equal, and if you live in a location where winter hits especially hard, you need a cold-climate heat pump. Talk to your HVAC contractor about options for your home and what type of heat pump models may work best.

Are Heat Pumps Effective in Cold Weather?

Understanding how heat pumps work can help you evaluate how effective they might be in colder weather.

We already covered that heat pumps take warmth from outdoor air and move it into your home during the winter. But these components aren't simply sucking hot air from one space into another; they're transferring thermal energy from the air via refrigerant. The warmed refrigerant moves into your system, where it's heated further. That warmth is then transferred through your house.

Even air that feels cold to you in January typically has some heat energy that can be pulled into this process. So, heat pumps in colder climates can work pretty well.

Of course, as the outdoor temps plummet, heat pumps have to work harder because there's less heat energy available. Older heat pumps from a few decades ago typically couldn't handle this load. Now, you can get cold-climate heat pumps that work fairly well and can pull heat from air even below 0 degrees Fahrenheit (-18 degrees Celsius).

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What to Know About Running a Heat Pump in the Winter

Extreme Cold: At What Temperature Do Heat Pumps Become Ineffective?

There comes a point when heat pump heating may not be the most effective or efficient option for your home. If you live in a super-cold area, you'll likely want a backup system to help when temps fall very low. If your area gets regular winter temps below -10 to -15 degrees Fahrenheit (-23 to -26 degrees Celsius), you may want to consider adding backup heat from electric heaters, gas furnaces or fireplaces.

Source Matters for Heat Pump Efficiency in Cold Weather

Also, two major types of heat pumps exist. Air-source heat pumps pull heat from outdoor air. Ground-source heat pumps, also called geothermal heat pumps, pull heat from the ground. Because the ground tends to stay warmer than the air, ground-source heat pumps are less affected by deep winter temperature drops.

Technology also improves constantly, and heat pump efficiency in the winter gets better all the time. So don't worry about using a heat pump for climate control year-round. But do talk to your HVAC pro about the right unit for your space, and ensure you're investing in heat pump maintenance for the winter months.

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