A dehumidifier will not lower the temperature of your room, but it will make the air feel cooler on your skin

A dehumidifier removes water vapor from the air, not heat. The actual temperature reading on a thermometer will stay the same or even rise slightly, because the machine produces a small amount of warmth as it operates. However, humid air feels warmer than dry air at the same temperature — sometimes significantly warmer — so removing moisture makes the room feel more comfortable even though the thermometer has not moved.

This distinction matters because it changes what a dehumidifier can and cannot do for you. If your goal is to lower the actual temperature in a room, a dehumidifier is not the tool. If your goal is to feel less hot and sticky, a dehumidifier works well and costs less to run than an air conditioner.

Key Takeaways

  • A dehumidifier removes moisture from air but does not lower temperature; the room may feel cooler because dry air feels more comfortable on skin, not because it is actually cooler.
  • High humidity makes sweat stay on your skin instead of evaporating, which is why 75°F at 80% humidity feels hotter than 75°F at 40% humidity.
  • A dehumidifier uses less electricity than an air conditioner and works in any room, even those without windows for a window unit.
  • If you need both lower temperature and lower humidity, you need an air conditioner, which cools and dehumidifies at the same time.

Why humid air feels hotter than dry air

Your body cools itself by sweating and then letting that sweat evaporate from your skin. When the air is already full of moisture, sweat cannot evaporate as easily. Instead, it sits on your skin, making you feel hot and uncomfortable. This is why 75°F at 80% relative humidity feels much hotter than 75°F at 40% relative humidity — the actual temperature is identical, but your body cannot cool itself as efficiently.

A dehumidifier lowers the amount of moisture in the air, which allows sweat to evaporate faster. Your body cools down, and you feel more comfortable. The thermometer still reads 75°F, but your skin is no longer wet, and air movement across your body works better. This is a real comfort improvement, even though the room temperature has not changed.

The small amount of heat a dehumidifier produces

Dehumidifiers work by pulling air across cold coils, which condenses the water vapor into liquid. That liquid drains away, and the dried air passes over warm coils before returning to the room. This process generates a small amount of heat — typically between 2 and 5 degrees Fahrenheit warmer than the air that entered the machine.

In a small, sealed room, this heat can be noticeable. In a larger space or a room with air circulation, the effect is minimal. The heat output is far less than what an air conditioner would produce, but it is real enough that you should not expect the room temperature to drop when you turn on a dehumidifier. You may see a slight increase instead.

When a dehumidifier helps you feel cooler versus when it does not

A dehumidifier works best when humidity is high (above 60% relative humidity) and you are sensitive to moisture. In these conditions, removing water from the air produces a noticeable comfort improvement. You will feel less sticky, sleep better, and find it easier to be active without overheating.

A dehumidifier does not help much if the room is already dry or if the temperature itself is the problem. If your humidity is below 40% and you still feel hot, the issue is temperature, not moisture. In that case, you need cooling, not dehumidification. Similarly, if the room is 85°F and humid, a dehumidifier will make it feel less sticky but will not solve the underlying problem of excessive heat.

Dehumidifiers versus air conditioners: what each one does

An air conditioner cools the air and removes humidity at the same time. It is more expensive to buy and run than a dehumidifier, but it solves both problems. If you need the room temperature to actually drop, an air conditioner is the only option.

A dehumidifier is cheaper to operate and works in any room, including basements, bathrooms, and interior spaces without windows. It is the right choice if humidity is your main complaint or if you want to reduce the load on an air conditioner in a room that is already being cooled. Some people run a dehumidifier at night in a bedroom to improve sleep comfort without cooling the entire house.

How to tell if a dehumidifier will help your situation

Check the humidity level in your room with an inexpensive digital hygrometer, which costs $10 to $20 and takes a reading in seconds. If the humidity is above 60%, a dehumidifier will likely make a noticeable difference in how the room feels. If it is between 40% and 60%, the improvement will be smaller but still real. If it is below 40%, a dehumidifier will not help you feel cooler.

Also consider the actual temperature. If the room is 72°F and humid, a dehumidifier is a good choice. If the room is 82°F and humid, you will feel better with a dehumidifier, but you will feel much better with an air conditioner. A dehumidifier can take the edge off, but it cannot replace cooling when the temperature itself is too high.

Placement and settings for the best comfort effect

Place the dehumidifier in the center of the room or near the area where you spend the most time. A unit in the corner or against a wall will not circulate air as effectively. Run it continuously when humidity is high, or set it to a target humidity level (usually 45% to 55%) if your model has a humidistat. Most modern dehumidifiers will turn on and off automatically to maintain that level.

Empty the water collection bucket regularly, or connect a drain hose if your model supports it. A full bucket will shut the machine down automatically. Keep doors and windows closed while the dehumidifier is running so the moisture it removes does not get replaced by humid air from outside.

Frequently Asked Questions

Will a dehumidifier cool my room enough that I don't need air conditioning?

No. A dehumidifier makes the air feel more comfortable by removing moisture, but it does not lower the actual temperature. If the room is too hot, you need an air conditioner. A dehumidifier can reduce how hard the air conditioner has to work, but it cannot replace it.

Does a dehumidifier use a lot of electricity?

A typical dehumidifier uses 300 to 700 watts, depending on size and how hard it is working. This is less than most air conditioners (which use 1,000 to 1,500 watts) but more than a fan. Running a dehumidifier 24 hours a day for a month will add roughly $10 to $25 to your electric bill, depending on your local rates.

Can I use a dehumidifier and an air conditioner together?

Yes. In very humid climates, an air conditioner may not remove moisture fast enough, especially if you keep the temperature set high to save energy. Running a dehumidifier in the same room can help, though it will increase electricity use. This combination is most common in basements or in very humid regions.

What humidity level should I aim for?

Most people feel comfortable between 40% and 55% relative humidity. Below 30%, the air feels dry and can irritate your skin and sinuses. Above 60%, the air feels sticky and mold growth becomes more likely. Set your dehumidifier to maintain 45% to 50% for the best balance.

Why does my dehumidifier seem to make the room warmer?

The machine produces a small amount of heat as it operates, and in a small, sealed room this can be noticeable. If the room feels warmer after you turn on the dehumidifier, the heat output is outweighing the comfort benefit of lower humidity. Try running it only at night, or use a smaller unit, or may support the room has some air circulation.