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Sizing Of A Crawlspace Dehumidifier

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A Vapor Barrier and a Dehumidifier for your Crawl Space: Perfect Humidity Busters

Typically, air flows from the bottom of the home to the top. Sure enough, your crawl space is an arch target of this humidity attack. Because it’s close to the ground, it directly absorbs evaporation of moisture from the earth. Moist crawlspace air – and everything in it – is sucked up into the living areas of the home. Mold spores, odors, crawl space moisture, insects, and animals are part of them creating a very unhealthy environment. In cases like this, you should be prepared to stop the onslaught. This is where vapor barrier in crawl space comes in handy. Read the rest of this entry »

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Crawlspace Dehumidifier Installations

Installing a Crawlspace Dehumidifier is Easier Than it Sounds!


Have you ever installed a window air conditioner?  It’s about that easy – put it in position, run your drain hose and plug it in.  That’s it!  For your basic installation, follow the 3 steps below.  Scroll down further to see some very helpful tips for preparing your crawlspace area and installing the dehumidifier.

STEP 1

Place dehumidifier on wood or cement block.  The reason for the block is to raise the unit up so the water can drain down through a hose.  Use Adjustable feet to easily level the dehumidifier.

STEP 2

Take the female end of a standard garden hose and screw it onto the drain.  Run the hose down and out of your crawlspace or to a pump or drain.  You can purchase a condensate pump from our Buy-Now page.

STEP 3

Plug it in!  If you purchased a condensate pump, plug that into a standard household electrical outlet.

Helpful Tips for Installing Your Dri-CrawlSpace® Dehumidifier
Check Your Plastic Vapor Barrier

Before you begin installation, it’s a good idea to double check your vapor barrier.  Make certain the plastic sheeting is secured and that all vents and cracks are tightly sealed to provide effective moisture control.

What to Do With Your Crawl Space Vents

Until recently, crawlspace vents were designed to allow outside air into the crawlspace to help reduce humidity.  This practice began in 1938, but is currently being phased out.  Some out dated websites and contractors still repeat the fallacy that adequate venting will reduce crawlspace moisture levels.  The reality is that venting will only reduce crawlspace moisture levels when the outside air is dryer than 40% Relative Humidity.  Yet, in humid climates and conditions, the outside air will actually contain far more moisture than what you want in your crawlspace.

Where to Place Your Dehumidifier

When locating a spot in the crawlspace to place your dehumidifier, it is usually best to place the unit in the middle of the crawlspace.  This will provide a more centralized airflow that will allow your crawlspace dehumidifier to efficiently remove the most amount of moisture.  If you are using multiple units, space them apart to cover maximum area.

Raised Blocking for Proper Drainage

The next step is to determine how far off of the ground you must place the unit to allow for effective drainage.  The unit must be placed higher than the drain to allow the water to flow downward and out of the crawlspace.  This is referred to as a gravity drain.  Depending on the depth of your crawlspace and grading, you can place the dehumidifier on cinder blocks or you may simply use the half pallet on which the unit was delivered.  We do not recommend pouring water into the unit, though some people have been known to disregard our warning and remove the filter so that they may gently pour a cup of water into the styrofoam drain pan to test the effectiveness of their drain hose positioning.

Setting Up Your Drainage System

There are three ways to drain your crawlspace dehumidifier:

  • through the sump pump
  • through your existing HVAC/drainage systems
  • create your own drainage system

Creating your own drainage system is pretty easy.  Make a hole in your vent or outside wall, just big enough for the drain hose.   Be sure it drains far enough away so it cannot re-enter the crawlspace.  Depending on the size of your crawlspace and drainage logistics, you may need a condensate pump with additional drain tubing.  This is optional on most crawlspace dehumidifiers, and you can find them by clicking Buy-Now in the navigation above.

Electrical Safety

The final step is to make sure your crawl space dehumidifier is plugged into a properly grounded outlet.  To insure smooth and safe operation, clean the dehumidifiers’ filters yearly, as recommended in your instructions.

Clean Up That Moldy, Wet Crawlspace Below Your Home

By installing your new crawlspace dehumidifier, you have not only helped protect your home from moisture damage, but you are also helping to protect the health of you and your family by improving your indoor air quality.  The air beneath your home directly feeds into the air above where you live and breathe.  Mold colonies beneath your home constantly release spores into the air that travel upward into your home.  An effective crawlspace dehumidifier will dry out the mold colonies, causing them to fall dormant.  Maintaining a dry crawlspace will also prevent new colonies from forming.  Mixing bleach with water gives you a solution you can use to clean up and kill any existing mold.  This is usually a good practice when installing a dehumidifier.  To purchase one of our unique Dri-CrawlSpace® Dehumidifiers, go to the Buy-Now page in the top navigation.


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