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Crawl Space Dehumidifiers

Crawl spaces are constantly exposed to humidity, which means water vapor easily collects below your home. Dehumidifiers work to remove this excess water vapor and keeps your crawl space protected.

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Did you know that when air rises in a home, it is rising from up the ground, carrying any moisture or airborne components, like mold spores, with it. Experts estimate that up to half of the air on the first floor of our homes actually has risen up from the crawl space. Moisture levels contribute directly to the comfort of those living and working in the structure above. Thankfully, FSS offers a powerful crawl space dehumidifier with self-draining capabilities and superb protection against crawl space problem signs.

How Our Dehumidifier Works

  • After a free inspection with our team, we’ll recommend encapsulating your entire crawl space depending on your home’s individual problem. Dehumidifiers play a key role in encapsulation, and only having a single dehumidifier in your crawl space won’t protect you from all causes of crawl space damage.
  • Next, our team will install the required encapsulation solutions such as vapor barriers and drainage systems, along with your dehumidifier. Specifically, the dehumidifier is connected to your home’s drainage system and air system to ensure maximum dehumidification. Our dehumidifier is self-draining, so you don’t have to go through the trouble of getting below your home just to empty it.
  • Finally, the dehumidifier immediately begins removing water vapor from your crawl space. As it continues to work, your crawl space stays permanently protected from rising humidity. Plus, our dehumidifier is energy efficient and won’t break the bank in the long run.

What Makes Our Dehumidifier Stand Out?

  • Other dehumidifiers can only remove about 25-75 pints of water a day, but our crawl space dehumidifier can remove up to 100 pints a day.
  • Our dehumidifier is quiet, only clocking in at 55 decibels, and cause a disturbance in your home during late hours.
  • With an official EnergyStar certified guarantee, our dehumidifier gives you world class protection without hiking up your utility bills.

Signs Your Crawl Space Needs a Dehumidifier


Mold is one of the surest signs that humidity is too high in your crawl space. Mold thrives in environments with excess moisture and organic material. Your crawl space likely contains wooden support beams, an organic material that is perfect for mold to feed on. Mix this with high humidity, and your crawl space becomes a breeding ground for mold growth. Dehumidifiers remove the moisture that mold and mildew needs to survive and keep your home much drier in general.


Condensation forms when warm air mixes with cold air. Cold air is unable to hold as much water as warm air due to its low relative humidity, so when humidity enters your crawl space, the naturally cool air can’t contain all of it. As a result, condensation forms on nearly every surface below your home. This can lead to wood rot, damaged insulation, and structural problems in your crawl space. Dehumidifiers prevent this from happening in the first place.

Increased Energy Bills

Your HVAC system is designed to keep the temperature controlled throughout your home. Unfortunately, humidity in your crawl space can make this a much more difficult task. That’s because warm, humid air always rises thanks to a phenomenon known as the Stack Effect. When humid air rises through the floor and into your home, it causes your air conditioners to work on overdrive, consequently skyrocketing your bills. Dehumidifiers make it impossible for humid air to rise into your home and end up keeping energy bills lower.


We don’t advise using store-bought dehumidifiers in your crawl space. Most dehumidifiers can’t handle the amount of water that ends up in your crawl space. Even the “continuous drain” dehumidifiers you find at the store might still fill up quickly, and they can’t connect to your drainage system like ours. You might consider buying and installing your own dehumidifier, but it will end up becoming a burden as you constantly go below your home to empty it out.

Maybe you’ve lived in your home for a while and haven’t noticed any immediate problems in your crawl space. Unfortunately, crawl spaces promote an “out of sight, out of mind” feeling for many homeowners. While you might not notice wood rot, mold, or condensation in your immediate surroundings, these issues tend to creep up slowly in these foundation types. However, our dehumidifiers make these issues practically non-existent, which means you really can keep your crawl space out of sight and out of mind.

Keeping your crawl space somewhere between 35-45% ensures that mold cannot grow, and humidity can’t damage wooden structures. In fact, this is the recommended humidity level for almost every home in the United States. However, the hot and sometimes humid environments of Austin and San Antonio may require you to keep humidity levels a bit lower just to be safe.

Call FSS for a Free Inspection

Our dehumidifier services in San Antonio and the surrounding communities are guaranteed to help control the moisture levels in your crawl space. The technicians at Foundation Support Specialists will expertly install the right unit for your space, as well as determine long-term solutions for your dehumidifier, like connecting it to plumbing and air systems. Our team knows how to ensure your crawl space dehumidifier is working well and doing what it is supposed to do: protect your home in San Antonio from wet walls and floors. 

To learn more about dehumidifiers or other crawl space services provided by Foundation Support Specialists, contact us today and schedule a free inspection!

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