What should humidity be in basement in winter
Sarah Silva
Updated on April 18, 2026
During the winter months, you’ll want to keep your in-home humidity levels around 25 – 40 percent when outdoor temps range from 20° F to 0° F, with the lower percentages reserved for the colder temps.
What should basement dehumidifier be set at in winter?
Reduce use in winter as humidity will drop with cold or when heat is in use. Set to 60% or below. 45-50% are good settings to use. Set to 30-60% for desired comfort range.
What should I set my dehumidifier to in basement?
Basements are more exposed to a constant source of moisture from the external environment; therefore, your dehumidifier should run very frequently. Molds tend to become a problem at a relative humidity of 60% and above. Therefore, we recommend that you keep your basement dehumidifier within a range of 40% to 60%.
Do basements need humidifiers in winter?
As you debate whether or not to use a dehumidifier in winter, you should always watch the humidity levels in your home. … In fact, if your humidity levels remain above 50 percent, your room will benefit from a basement dehumidifier.What is a good indoor humidity level in winter?
While 30-40% is a good baseline for humidity levels in winter, you’ll have to go through a period of adjusting temperatures and your humidifier to find your perfect setting. But once you do, there’s no better feeling!
What percent humidity should a basement be?
Normal Basement Humidity Levels When your basement is too humid, you’ll probably be able to feel it. A comfortable basement should maintain a humidity level of 30 to 50 percent — however, those may differ depending on your climate.
Will mold grow at 55 humidity?
A relative humidity greater than 55 percent is enough to support the growth of black mold. … Household problems such as water and pipe leaks cause water intrusion and an environment perfect for black mold to grow. The mold can continue to grow unabated if a small leak goes undetected for a long time.
Should I get a dehumidifier for my basement?
In spaces that are naturally more damp, such as basements and crawl spaces, a dehumidifier will help dry the air, reducing musty odors and preventing mold growth and other issues caused by excess moisture. A basement dehumidifier helps maintain an ideal indoor relative humidity (RH) level in the space.Is 60 humidity too high for a basement?
Indoor relative humidity (RH) should be kept below 60 percent — ideally between 30 percent and 50 percent, if possible. … Low humidity may also discourage pests (such as cockroaches) and dust mites.
What should humidifier be set at in winter?A humidity level around 50% will cause damaging condensation on your home’s window sills and walls. When the temperature is between 0 and 10 degrees, you will be better served with a humidity level of 20%. At between 10 and 20 degrees outdoor temperature, change the setting to 25%.
Article first time published onWhat size dehumidifier do I need for basement?
For a very damp basement or other space, it might be necessary to increase the size of the dehumidifier to efficiently remove the increased level of moisture from the air. Choose a dehumidifier that holds 12 pints of water for a 500-square-foot space, adding 5 pints for every additional 500 square feet.
Do dehumidifiers use a lot of electricity?
Dehumidifier energy use is rather low. An average small 30-pint dehumidifier uses 300W of energy. … Essentially, a dehumidifier draws much less electricity than a water heater, an air conditioner, even a hair drier. An average dehumidifier draws about as much energy as a computer.
How long does it take for a dehumidifier to dry basement?
6. How long will it take to get the moisture under control? As long as the dehumidifier you choose is large enough for the area it is working in, and there are no specific damp problems, then a dehumidifier will normally reduce the humidity to the chosen level within a few days to a week.
Should you use a dehumidifier in the winter?
During cold winter months, the air in your home is usually dry, which means a dehumidifier is not necessary. … Most dehumidifiers should not be operated in temperatures below 60° F, since the moisture removed from the indoor air can freeze when it condenses on the cooling coils, which can damage the unit.
When should I turn on the humidifier in my house?
OutsideRecommended House Humidity-10°F to 0°F25%0°F to +10°F35%+10°F and above40%Summer monthsOff
What is a good humidity level for sleeping?
Best Humidity for Sleeping The best relative humidity for sleeping and other indoor activities has been debated. According to the Environmental Protection Agency, the best indoor relative humidity falls between 30% and 50%, and it should never exceed 60%. Other studies suggest 40% to 60% is a better range.
Do dehumidifiers help prevent mold?
Reduce Mold and Mildew A dehumidifier is designed to reduce the moisture level in the air by extracting the excess water. By doing so, dehumidifiers can help prevent the growth of mold and mildew and improves the indoor air quality of your space.
Is 60 humidity too high for flowering?
Ideal indoor relative humidity levels can range from 70% in the seedling stage to as low as 30% during the flowering stages. … Any humidity level over 60% could potentially damage the plant, which is relying on moisture from the soil to nourish itself.
Is 55% humidity bad?
The ideal temperature in your home will be specific to your family’s preferences and maintaining recommended humidity levels at different times of the year will ensure your comfort and safety. ASHRAE suggests a range of 45% – 55% humidity to manage health effects and illnesses.
Is 30 Humidity too low?
The healthy range for humidity is around 40% to 50%, with a little tolerance for going higher or lower; however, humidity should never be allowed to fall below 30%. Humidity level lower than 30% is what is characterized by very dry air, as well as other symptoms synonymous with the atmospheric condition.
How much humidity is too much in a basement?
Although 30 to 50 percent is ideal, anything above 60 percent is considered excessive. If your basement feels damp, it’s probably too humid. You’ll need to take action, or you risk accumulating mold, mildew, and fungal growth and the creation of ideal termite conditions.
Should a dehumidifier be left on all the time?
Should a Dehumidifier Run Constantly? No, there is no need to keep the dehumidifier running constantly. It’s generally enough to run the unit when the humidity level is 50% or higher. A good rule of thumb to remember is to maintain a comfortable 30-50% humidity level for most homes.
Do I need a humidifier or dehumidifier in basement?
Basements are damp because moisture may seep through the foundation, enter through water leaks, or due to high humidity levels within the main home. … Using a basement dehumidifier to keep humidity levels below 50 percent can prevent mold and mildew growth, protecting indoor air quality and preventing damage.
How do I know if I need a dehumidifier?
- Moist or wet stains are present on walls or ceiling.
- Room feels unpleasantly stuffy.
- Windows are covered with condensation.
- Musty odors exist.
- Mold is visible.
- Excess moisture.
What should aprilaire be set at in winter?
What is the proper relative humidity to have in my home during the winter? Aprilaire like any other humidifier manufacturer designs our humidifiers to maintain an indoor relative humidity of 35% at an indoor temperature of 70F, anytime the outdoor temperature is 20F or above.
When should you turn your humidifier on in the winter?
The best approach is to turn on your humidifier when you start to notice the air in your home is dry, but you can also act proactively and start using them as soon as you fire up your furnace for the season.
Is a 50 pint dehumidifier enough for basement?
40 to 50-Pint Dehumidifiers They are ideal for a damp basement or room, with clear indications of excess moisture, such as visible mold growth, damp stains, and musty odors.
Is it better to get a bigger dehumidifier?
Your standard dehumidifier will remove the moisture from the air in your home, but the size you need depends upon the size of the space in question. … A model that’s too small for your space may hardly make a dent in the moist air, while one that’s too large may make the air excessively dry.
How much does it cost to run a dehumidifier in the basement?
How much does it cost to run a dehumidifier (on average)? Between $0.03 and $0.16 per hour. If you run a dehumidifier 24/7, that amounts to $0.72 to $3.84 per day.
Can you run a dehumidifier 24 7?
You can run your dehumidifier for 24 hours every day, but this will put a strain on the internal components. As a result, the lifespan of the dehumidifier will be shortened and you’ll need to purchase a new one. Running the dehumidifier 24/7 will also raise your electricity bills tremendously.
Can I leave dehumidifier on 24 7?
Most dehumidifiers can handle overnight running with relative ease far as there is no err on your path (maintenance, air flow, no blockage, leakages), it is very safe to use overnight. It is recommended that the device has the auto defrost feature however, if for any reason it starts to overheat, so it goes off.