Crawl Space Dehumidifiers 

 August 27, 2015

By  Enda

best crawl space dehumidifiersThe purpose of a good crawl space dehumidifier is to remove moisture from the air. In turn this will result in preventing mildew, mould, potential wood rot and stale musty odours.

They are similar to all dehumidifiers except for one thing in that they are designed to fit in cramped areas where traditional appliances can not.

A crawl space can not only have very high humidity levels, but it also has darkness. When combined this type of environment can attract a whole range of insects such as termites and even ants.

We do not need any of those in our homes and that’s for sure.

General Buying Guide

Crawl space dehumidifiers need to be compact and fairly rugged in design and application. They come in a variety of shapes and sizes. As you can imagine it is harder to remove moisture in a confined space and usually requires more air pressure to circulate air through any type of crawl space. The bad news is that these specific type of dehumidifiers are typically more expensive than your standard appliance.

Your house is actually filled with tiny spores and these can cause allergies. An untreated crawl space underneath the house will have a very poor air quality. As warm air escapes through the roof of your home it is replaced with colder air and more importantly humid air from the crawl space beneath your floors. If this space suffers from humidity then mold happens and spores form from this, and enter into the air in your house.

This is a horrible thing to say but typically where you have moisture you most likely have a high increase in attracting vermin like spiders, cockroaches and rats. Moisture in a crawl space can also cause wood rot and squeaking floorboards. Over time that can actually impact on the structural elements of your home.

How To Prevent and Solve Mould Problems In A Crawl Space

Using A Crawl Space Dehumidifier

Powerful Air Creating Fans

A simple solution to avoid all this misery is to install a crawl space dehumidifier. The amount of moisture they can remove is still an important consideration but in the case of crawl space you also need to consider the amount of airflow you can drive and for this you also need more powerful fans. Make this a strong consideration when you are making your choice.

Energy Star Compliance

Another recommendation is to ensure it has Energy Star compliance.

If you follow the above advice then you can get some great benefits as a result. These include saving money on your electric bills, protecting your home from wood rot, removing any damp and dusky smells and reducing the amount of nasty insects in your home.

We would also advise not to fit a standard dehumidifier in your crawl space are as it is not designed to do the job and all you will get are high running costs and a lot of hassle without solving the core problem.

Crawl space dehumidifiers are also used to dry out a basement or under floor that has suffered from flooding. Usually these are commercial ones and are expertly installed. They do however work on the same principles as normal consumer dehumidifiers. We have listed below a few of the best products available in the market right now.

Tjernlund UnderAire Crawl Space Ventilator

This one gets rated at 4.5 out of 5 stars by almost 200 buyers over at Amazon. This is a deluxe double fan that is very powerful and can move air around very quickly. It comes with a built in dehumidistat, and also has a thermostat which will stop it from freezing up in the colder periods.

Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220 CFM

The motors on this product have been sealed and that enures you will get a longer life out of your dehumidifier. It is also been designed to fit into ventilation openings in block foundations.

You Can Read More Reviews over at Amazon By Clicking Here

The product above costs around $150 but a single fan version is available, which you can read about by clicking here.


Thermastor – Santa Fe – Compact 2 Crawl Space Dehumidifier – 70 pints/day.

This one costs around $1,100 so you may well ask why the big price hike when compared to the ones I have already mentioned above. Well this is the type that professionals will fit in homes where the air moisture is very heavy.

As you can see from the name, this amazing dehumidifier can remove a full 70 pints of water from the air in any crawl space. It has been designed to deal with basements or crawl spaces that are up to 1,600 square feet and does a fantastic job.

Thermastor - Santa Fe - Compact 2 Crawl Space Dehumidifier - 70 pints/day.

This one is small in size and highly compact so as not to take up too much space. It measures 12″ tall and 12″ wide and weighs 65 lbs.

What really makes this one stand out from the others is that it is ultra efficient so does not use a lot of power when it is removing the moisture. One reviewer had this to say:

“It totally dried out the 800 sq ft basement. Before humidity was around 68%, the dirt in the crawlspaces was saturated, and there were beads of water under the plastic sheeting laid over the soil. Now the dehumidifer is holding the humidity down at 49% and the soil in the crawlspaces is dry.”

You can read more reviews on this one by clicking here.



Here at TheIcySpot.com we are committed to helping you find the best fan for your home. We try to provide you with all the information that you will need on all types of fans and accessories to enable you to make the best and most informed buying decision.

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