Will a Dehumidifier Cool the Room?

A dehumidifier usually will not cool a room. It removes moisture from the air, and its motor and operating cycle typically release heat into the room. Lower humidity can make the space feel less muggy, but the actual air temperature may stay the same or rise slightly.

What a dehumidifier does to room temperature

A portable dehumidifier draws in moist air, removes water, and sends the drier air back into the room. The unit’s compressor and fan generate heat as they run, so the air coming out can feel warm. In a closed room, the appliance can gradually raise the temperature.

How much the temperature changes depends on factors such as the unit, room size, how long it runs, and ventilation. Check the manufacturer’s instructions for the unit’s operating conditions and clearances.

Why drier air can feel cooler

Humidity affects how readily sweat evaporates from your skin. When the air is less humid, sweat can evaporate more easily, which may make you feel more comfortable even if a thermometer shows little change—or a slight increase.

That difference is most noticeable when a room feels clammy. A dehumidifier can improve comfort, but it does not provide the direct cooling that air conditioning does.

How to cool a hot, humid room

• Use air conditioning when you need lower air temperature. An air conditioner removes heat from the room; many models also remove some moisture.
• Use a dehumidifier for dampness or persistently high indoor humidity. Follow its manual for placement, temperature limits, and drainage.
• Avoid running both appliances unnecessarily. If using both, set them up according to their manuals and adjust based on room temperature and humidity.
• Keep the dehumidifier’s air intake and outlet clear. Restricted airflow can affect operation and comfort.
• Check both temperature and humidity. A basic indoor thermometer-hygrometer can help distinguish a hot room from a damp one.

If the room remains hot, a dehumidifier is not a substitute for air conditioning, shading, or addressing heat entering through windows and walls. If humidity remains high despite continuous operation, check that the unit is correctly sized and set up, and look for an ongoing moisture source such as a leak.