Yes, you can use a dehumidifier in winter, but it works differently than in summer
Winter air is already dry — heating systems pull moisture out of your home as they run. A dehumidifier removes even more moisture, which can make indoor air uncomfortably dry and cause problems like cracked skin, static electricity, and damage to wood furniture and musical instruments. In most homes, winter is the time to add humidity back in, not remove it.
That said, dehumidifiers do have a winter use case. If your basement stays damp year-round, or if you have a moisture problem in a specific room despite the season, a dehumidifier can still help. The catch is that cold air holds less moisture, so the machine has to work harder and may not perform as well as it does in summer.
The real question is not whether you can run one, but whether you should — and the answer depends on where the moisture is coming from and how wet your space actually is.
Key Takeaways
- Winter heating dries out indoor air naturally, so running a dehumidifier usually makes the problem worse, not better.
- Basements and crawl spaces can stay damp in winter because cold air holds less moisture, and a dehumidifier may still help in those spaces.
- Dehumidifiers work less efficiently in cold temperatures and may frost up or stop working if the room drops below 60°F.
- If you have a moisture problem in winter, check for leaks, poor ventilation, or condensation on windows before turning on a dehumidifier.
- A humidifier is usually the right tool for winter indoor air, not a dehumidifier.
Why winter air is already dry and what that means for dehumidifiers
Heating systems warm air, and warm air can hold more moisture than cold air — but the moisture in your home does not increase when you heat it. The same amount of water vapor spreads across warmer air, making the air feel drier. This is why winter indoor humidity often drops to 20 to 30 percent, well below the 30 to 50 percent range most people find comfortable.
A dehumidifier removes moisture from the air by pulling it across cold coils, where water condenses and drips into a tank or drain. In winter, when the air is already dry, the machine has less moisture to pull out. It also has to work harder because cold air is denser and moves through the coils more slowly. The result is poor performance and wasted energy.
Running a dehumidifier in winter can push indoor humidity below 20 percent, which causes dry skin, irritated sinuses, and static shocks. It can also damage wood floors, furniture, and stringed instruments, which shrink and crack when humidity drops too low.
When a dehumidifier actually makes sense in winter
Basements and crawl spaces are the main exception. These spaces stay cool year-round and often have moisture problems in every season — from groundwater seepage, poor drainage, or lack of ventilation. In winter, a basement may feel dry to you because the air is cold, but the relative humidity can still be high. A dehumidifier can help keep mold and mildew from growing.
The same applies to any room that stays significantly cooler than the rest of your home — a detached garage, a room with poor insulation, or a space with a persistent leak. If moisture is visibly condensing on windows or you smell mildew, a dehumidifier may help even in winter.
Before you run one, though, fix the source of the moisture first. If water is seeping in through cracks in the foundation, or if a window is leaking, a dehumidifier is a temporary patch, not a solution. Seal the leak, improve drainage, or add ventilation — then see if you still need the machine.
How cold temperatures affect dehumidifier performance
Dehumidifiers are designed to work in temperatures above 60°F. Below that, the coils get cold enough that moisture freezes on them instead of dripping into the tank. This is called frost buildup, and it clogs the coils and stops the machine from working. Some newer dehumidifiers have a defrost cycle that runs automatically, but it reduces efficiency and uses more energy.
If your basement or garage stays between 50 and 60°F in winter, a dehumidifier will struggle. If it drops below 50°F, the machine may not work at all. Check the temperature of the space before you buy or run one.
Even in spaces that stay above 60°F, winter dehumidifiers use more energy to remove the same amount of moisture because the air is colder and denser. You are paying more to get less result.
Condensation on windows and what it really means
Condensation on windows in winter looks like a moisture problem, but it is usually a sign that your home is too humid, not too dry. When warm, moist air inside hits a cold window, the moisture condenses into droplets. This happens most often in bedrooms and bathrooms after showers, or in kitchens after cooking.
The fix is not a dehumidifier — it is ventilation. Run your bathroom exhaust fan during and for 20 minutes after a shower. Use your kitchen range hood while cooking. Open a window for a few minutes to let moist air escape. If condensation is heavy and constant, you may have a ventilation problem or a leak, not a humidity problem that a dehumidifier can solve.
If you run a dehumidifier to stop condensation, you will dry out the rest of your home and create other problems. Treat the condensation at its source instead.
Humidity levels to aim for in winter
Most people feel comfortable between 30 and 50 percent relative humidity. In winter, indoor humidity often falls to 20 percent or lower because of heating. Rather than remove more moisture with a dehumidifier, most homes need a humidifier to add it back.
A humidifier — the opposite of a dehumidifier — releases water vapor into the air. Whole-house humidifiers attach to your furnace and run automatically. Portable humidifiers sit in a room and need to be refilled. Both can bring winter humidity back to a comfortable range without the energy cost or the damage to wood and instruments that comes from air that is too dry.
If you are not sure whether your home is too dry or too humid, buy an inexpensive hygrometer (a device that measures humidity) at a hardware store. Hang it in your bedroom or living room for a few days and check the reading. If it is below 30 percent, add humidity. If it is above 50 percent and you see condensation on windows, improve ventilation. If it is between 30 and 50 percent, leave it alone.
Basements and crawl spaces: the winter dehumidifier exception
Basements are cold and often damp, which makes them the one place where a dehumidifier can help in winter. Groundwater seeps through foundation cracks, sump pump discharge can raise humidity, and poor ventilation traps moisture. Even though the air feels dry because it is cold, the relative humidity can be 60 percent or higher — high enough for mold to grow.
If your basement stays between 55 and 65°F and you have a moisture problem, a dehumidifier with a defrost cycle is worth considering. It will work, but not as well as it does in summer, and it will use more energy. Run it only if you see visible mold, smell mildew, or have a sump pump that is running constantly.
Before you buy one, seal cracks in the foundation, make sure gutters and downspouts drain at least 4 feet away from the house, and check that your sump pump is working. These steps often solve the problem without a dehumidifier.
Frequently Asked Questions
Will a dehumidifier help with dry skin and static electricity in winter?
No — a dehumidifier will make both worse. Dry skin and static happen because winter air is already too dry. You need to add humidity with a humidifier, not remove it with a dehumidifier. If you are running a dehumidifier in your living space, turn it off and consider a humidifier instead.
Can I use a dehumidifier in an unheated garage in winter?
Not reliably. Unheated garages often drop below 50°F, and dehumidifiers stop working or frost up below 60°F. If your garage stays above 60°F because of a heater or because it is attached to your home, a dehumidifier may help if you have a moisture problem. Otherwise, improve ventilation by cracking a door or window instead.
What if my basement is wet and cold — should I use a dehumidifier?
Only after you fix the water problem. If water is pooling or seeping in, a dehumidifier is a temporary band-aid. Seal foundation cracks, improve drainage around the house, and make sure your sump pump works. Once the water problem is solved, a dehumidifier can help prevent mold in a damp basement.
Is it bad to run a dehumidifier and a furnace at the same time?
Yes. The furnace heats and dries the air, and the dehumidifier removes more moisture. You are working against yourself and wasting energy. If your home feels too dry in winter, turn off the dehumidifier and run a humidifier instead.