What is the best dehumidifier for crawl space?

Asked By: Feras Zaremba | Last Updated: 23rd May, 2020
Category: home and garden home appliances
4.6/5 (44 Views . 14 Votes)
Our Top 5 Crawl Space Dehumidifiers
Rank Model Brand
#1 F413 Revolution LGR Dehumidifier Dri-Eaz
#2 PHD Compact Dehumidifier Dri-Eaz
#3 Sentinel HDi90 Dehumidifier AlorAir
#4 1820 Crawl Space Dehumidifier Aprilaire

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Also know, what size dehumidifier do I need for my crawl space?

A 30-pint dehumidifier is suitable for basements and crawl spaces of up to 1,500 square feet. 40 to 50-pint dehumidifiers tend to fall somewhere in the middle of the range as far as capacity is concerned. Again, they are suitable for spaces up to 2,000 square feet in size much like the 30-pint units.

Also, how much does a crawl space dehumidifier cost? Cost of a Basement or Crawl Space Dehumidifier You should expect to pay somewhere between $870 and $1600 for a good-quality dehumidifier (depending on the size of your space), although you may have to invest a bit more for a superior-quality 70-pint unit.

Additionally, do dehumidifiers work in crawl spaces?

A dehumidifier can prevent mold and mildew, but it won't remove it once it is established in your crawl space. Like standing water and leaks, you should remove mold and mildew before placing a dehumidifier in the crawl space.

Why are crawl space dehumidifiers so expensive?

The reason is that their cooling surface is much larger than on the lower end dehumidifiers so more moisture is removed from the air at a given time. The less expensive dehumidifiers more often or not are more expensive to repair than replace which explains the short life.

36 Related Question Answers Found

Should crawl space vents be open or closed?

✅Vote: open and close crawlspace vents seasonally
In the winter, when the air is drier, the vents are closed to reduce the chance that the pipes in the crawlspace might freeze. So our answer is to open and close the vents in your crawlspace seasonally, instead of deciding to seal off crawl space vents altogether.

Where should you place a dehumidifier?

To use your dehumidifier, put it in the most humid room in your house, like the bathroom, laundry room, or basement. Try to place your dehumidifier as close to the center of the room as you can, or at least 6-12 inches away from walls and furniture, since it will work better when there's good air flow around it.

What is the proper humidity for a crawl space?

As you can see, it's important to monitor your crawl space to prevent costly structural damage. Your ideal relative humidity is 55%, and this should be maintained throughout the year.

How do you dehumidify a crawl space?

4) Keep moisture out of your crawl space with crawl space encapsulation.
  1. Install a sump pump to remove any excess moisture, if needed.
  2. Lay a thick, 20mil vapor barrier, like CrawlSeal, over the floor and up the wall.
  3. Install an energy-efficient crawl space dehumidifier to keep the space dry.

How much does it cost per month to run a dehumidifier?


Let's take a standard model that operates at 280 Watts-hour. If the current power rate is 15 cents/kW, an electric dehumidifier uses 4.2 cents of power per hour. Therefore, if you run it for 10 hours a day, the cost is 10 hours * 4.2 cents = 42 cents/day or about $153.30 per year.

Can one dehumidifier do a whole house?

Whether you'll want to go with a whole-house dehumidifier or a portable one depends on how much of your home has excessive humidity levels. Portable dehumidifiers can work for a small area, like a basement, but to decrease humidity levels throughout your home, you'll want to go with a whole-house dehumidifier.

How much water should a dehumidifier collect in a day?

How much water does a typical dehumidifier extract per day? Most manufacturers love to make claims of 10 to 20 litres per day on most small domestic dehumidifiers and up to 50 litres on larger models.

What is a good dehumidifier for a crawl space?

The Dri-Eaz F413 Revolution LGR Dehumidifier is the best-rated crawl space dehumidifier for huge areas up to 7,000 square feet. It's a commercial grade unit that dries out areas other dehumidifiers just aren't powerful enough to handle.

Should you close crawl space vents in the winter?

FAQ: Should I close my crawl space vents during winter? In short the answer is generally yes, they should be closed up during the winter months. If you follow our Monthly Maintenance Schedule, we recommend the month of October as a good time to do this.

Where should a dehumidifier be placed in a crawl space?


Installing A Crawl Space Dehumidifier. Your dehumidifier should be located in an area where the discharge airflow is not blocked. It best to place the dehumidifier on concrete blocks (hanging the dehumidifier can transfer noise to the space above).

How do you ventilate a crawl space under a house?

Let's take a look at each of these methods.
  1. Vent the crawl space to the outside. Do this in a humid climate, and you're asking for trouble.
  2. Supply air from the HVAC system.
  3. Exhaust air to the outside.
  4. Install a dehumidifier.

What kind of insulation do you put in a crawl space?

The best insulation material for crawl spaces is rigid foam insulation board. Instead of installing the foam insulation between floor joists in the crawl space, the foam board is installed against the crawl space foundation walls.

Will a fan dry out crawl space?

Using crawl space fans to blow outside air in and control moisture in the crawl space sounds like something that makes a lot of sense. After all air is known to dry things, therefore by increasing the amount of air that gets into the crawl space, things will dry out better and faster.

Is it normal to have moisture in crawl space?

Pooling water and moisture are common problems in a crawl space. Because the crawl space is a below-grade space under the house, you might think it's normal to have a moist crawl space. After all, the ground gets wet and dry through the seasons and with weather patterns event.

How much mold in crawl space is acceptable?


But a buyer who falls in love with a house should not necessarily be shocked if mold is found in an attic or crawl space by an inspector. These two areas of the home are ripe for mold infestation – we have read some studies that indicate as much as 60% of all crawl spaces have mold.

How do I block crawl space vents?

How to Cover Crawlspace Vents for Winter
  1. Measure the height and width of a crawlspace vent opening with a tape measure.
  2. Mark the height and width on the surface of a 2-inch-thick foam sheet with a marker.
  3. Set the cut piece of foam on top of a magnetic sheet.
  4. Apply contact cement to one side of the magnetic sheet and one side of the foam sheet.

Does a dehumidifier reduce radon?

A radon remediation method like ASD will not only reduce radon levels in a home, but it will also dehumidify the home. A dehumidifier, on the other hand, won't have any meaningful impact on radon levels. In fact, a dehumidifier was only able to achieve 8% to 25% of the moisture capacity that the ASD did!