Dehumidifiers – Does a Dehumidifier Raise Air Temperature?

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Do Dehumidifiers Raise the Air Temperature? Q&A


QUESTION:

Hi,
I live in an area where both the temperature and humidity are high. I bought a dehumidifier recently, to control the growth of household mold. As instructed by the manual, I kept all the windows and doors of the kitchen closed, and kept the dehumidifier running. It works, and collects about 4-8 liters [1-2 gallons] of water per day.

However, I noticed that the air blown out from the dehumidifier is warm. As a result, the whole kitchen becomes warm and stuffy, which makes me wonder…is this normal? Do all dehumidifiers blow out warm air? Can’t it be just air at room temperature, as I understand that cold air will condense, which is also not good for controlling moisture.

My region is warm enough already, and while this dehumidifier does control moisture level, it brings a whole other set of problems.

Please advise!

Thanks,
Danny

ANSWER

Hi Danny,

Frigidaire FFAD7033R1 70 Pint Dehumidifier
Frigidaire 70 Pint Dehumidifier

Dehumidifiers are great way to combat household mold and lower mold growth in your home. To be clear, dehumidifiers are designed to remove moisture from the air, not cool it. Unfortunately, the way they remove this moisture is to reheat the air to further dry it after it releases its moisture. Basically, the room-temperature humid air enters the dehumidifier, where it’s then cooled to its dew point, which results in its releasing its moisture. This dried air is then heated by the combination of latent heat of condensation, which is a natural result of the process, and by circulating through the condenser where heat is exchanged from it to the air. There’s also some additional heat generated by the dehumidifier’s air compressor. The overall result is that the air going back into the room might be warmer than it was going in, usually around 10 to 15 degrees.

friedrich-50-pint-dehumidifiers
Friedrich 50 Pint Dehumidifiers

Sizing dehumidifiers correctly is really important, if your kitchen is getting too warm because of the dehumidifier, you might be using a dehumidifier too small for the job. A smaller than necessary dehumidifier will keep running to keep up with the larger air volume. A more appropriately sized dehumidifier will run and then turn off when the humidity has been lowered enough and will not run when the humidity level is lower. You should be using a dehumidifier that’s able to bring the humidity down to between 40 to 50 percent. With your current dehumidifier you can add an adjustable humidistat to help the dehumidifier regulate the humidity at a set level. A humidistat allows you to run the dehumidifier only when it is needed to bring down the overall humidity of your kitchen and will stop the dehumidifier from raising the temperature of the room  This allows the room not to get as warm as if the dehumidifier is constantly running.

Please feel free to contact me here 1-866-627-4605 to discuss any of the dehumidifiers we offer at AllergyBuyersClub.com.

Sincerely,
Dave Barnaby

  • Edmund Wong

    Can we skip the part of reheating the air and directs the dried air out thereby cooling the room at the same time… Isn’t that better?

  • ConcentratedTHC

    It’s called an Air conditioner lol.

  • I apologize we’ve been slow to respond, we’re just seeing this now, it sounds like an Air Conditioner would the best option.

  • tim-c

    The heat still exists in the system, and it will radiate out if you don’t vent it out. The only way to get rid of that is to vent that excess heat outside. As others have said, that’s what an air conditioner does.

    People also consider using an evaporative cooler inside their house, which cools the air, but adds humidity. Adding a dehumidifier to the mix would create a stalemate of sorts with the 2 appliances fighting with one another. Again, the problem has already been solved, and the solution is an air conditioner. It will dehumidify and also transfer the heat from inside of your house to the outside.

  • If you’re worried about the temperature in the space, than an air conditioner probably makes the most sense for your situation.