A crawl space is the one part of your house you never look at and always pay for. Damp air down there creeps upward, feeds mold, softens wood, and makes the whole house smell like a cellar.
The fix is a dehumidifier built for the job. Not the bucket kind from the big-box store. The kind with a pump or a hose, a tough case, and a low profile that fits between the joists.
Quick answer: the ALORAIR Helios MP35 is the best all-around crawl space dehumidifier here, because it drains by hose or pump. The Yaufey 70-pint is the value pick. Want a premium, whole-system setup? Look at the AprilAire E070W or the Santa Fe Compact70.
One warning before you shop. That “70 pints” on the box is measured at brutal, near-saturated conditions. Under the standard AHAM test, most of these units are rated at about 35 pints a day. Plan around the smaller number.
Table of Contents
Best Crawl Space Dehumidifiers: Quick Comparison
Tap anywhere on a row to check the price on Amazon.
Prices and ratings checked October 2026 and change often. Several of these listings have under 250 reviews, so treat the star ratings as early signals.
Crawl Space Dehumidifier Rules You Should Know First
- Size by the standard rating, not the headline number. A 70-pint unit that does 35 pints under AHAM test is a 1,000 sq ft crawl space tool, not a whole-house one.
- Drainage decides the install. A floor drain or a downhill route outside means a gravity hose is fine. Anything else needs a pump.
- It must handle cold. Crawl spaces run cool. Look for automatic defrost and a stated minimum operating temperature.
- A dehumidifier does not fix water. Standing water, a leaky pipe, or open soil needs fixing first.
1. ALORAIR Helios MP35 (70 Pint, With Pump): Best Overall
The MP35 does two things well. It comes with a gravity drain hose for a floor drain, and it has a built-in pump for sites without one. The maker says the pump can lift water vertically, so it can send water up and out of the crawl space instead of leaving it sitting.
It is rated at 35 pints per day under AHAM and 70 pints at saturation, for areas up to about 1,000 sq ft. The case is corrosion-resistant, it uses R32 refrigerant, draws about 323 watts, and comes with a six-year limited warranty. Dimensions are roughly 16 x 12 x 13 inches.
The catch: about 55 reviews on Amazon so far, with a 4.3-star average. Promising, not proven. Costs about $350.
Verdict: the most flexible install here. Buy it when you are not sure how the water will leave.
2. Yaufey 70 Pint Energy Star: Best Value
Yaufey gives you a metal case, a 6.56-foot gravity drain hose, and a digital panel for $300. It is Energy Star rated, runs at about 265 watts, and handles humidity from 10 to 90 percent. It can sit freestanding or hang from joists, which helps in tight spaces.
The listing claims it covers up to 5,000 sq ft, which is a big stretch for a unit rated at 70 pints under extreme conditions. Treat the coverage claim loosely and size the unit to the space instead. It weighs about 41 pounds, and it has a 4.3-star rating across roughly 210 reviews.
Verdict: the best price for a sturdy crawl-space-ready build, as long as a floor drain is within reach.
3. ALORAIR 70 Pint Energy Star (With Drain Hose): Quietest and Lightest
Quiet is the angle here. The maker lists operation below 52 dB, and the unit weighs about 25 pounds, the lightest on this list. A drain hose is included, so continuous draining works from day one. It has auto-defrost, and the maker lists a six-year limited warranty.
It is rated for up to 1,000 sq ft. Only about 50 reviews so far, 4.1 stars. The included filter is a basic one, so plan to swap in a better filter if dust is a problem. Costs about $344.
Verdict: pick it when weight and noise matter, for example when the crawl space access is tight and a unit is carried in and out.
4. Abestorm 70 PPD With Pump and Hose: Best for Long Pump Lifts
Abestorm gives you a choice of gravity drain or a built-in condensate pump, and the listing states a lift of about 19.6 feet. That is handy when the nearest drain is a long way up or across. It is rated for spaces up to about 1,000 sq ft, weighs about 38 pounds, and has auto-defrost and a five-year limited warranty.
Amazon’s spec table lists 35 pints per day, in line with the others. Rating: 4.1 stars from about 190 reviews. Costs about $317.
Verdict: good value when the water has to travel up or far.
5. AprilAire E070W Smart Wi-Fi: Premium Whole-Package Pick
This is the name-brand, set-it-and-forget-it version. The bundle includes a low-profile condensate pump, hanging kit, and MERV 11 filter, plus Wi-Fi control through the AprilAire app. The maker says it removes up to 70 pints a day and covers up to about 2,200 sq ft. It weighs about 56 pounds and draws roughly 700 watts.
It costs about $1,525 and has only a handful of Amazon reviews (6 so far, 4.1 stars). You pay for the brand, the kit, and the app. For a deeper look at a related AprilAire model, see our AprilAire 1820 Pro review.
Verdict: buy it if you want a complete, app-controlled kit and a bigger budget.
6. Santa Fe Compact70 Complete Crawl Space Kit: Low-Profile Specialist
Santa Fe builds dehumidifiers for crawl spaces. The Compact70 is about 12 x 21 x 12 inches, so it fits where taller units cannot. The listing includes MERV 13 filtration, auto-defrost, and a built-in humidistat, and lists operation down to 49 degrees F. Airflow is about 150 CFM and the rating is 70 pints.
The price is about $1,660, and the listing has just 4 reviews, all positive. That is not enough history to judge. Read our Santa Fe Compact 2 review for more on the brand.
Verdict: the pick for a low, narrow crawl space where height is the problem.
Encapsulated or Vented Crawl Space: Why It Changes Everything
A vented crawl space has openings to outside air. In humid summers that air flows in and brings moisture with it. The dehumidifier fights the weather all season.
An encapsulated crawl space is sealed with a vapor barrier on the floor and walls. The air inside is much easier to control, and a dehumidifier works far better there. If the crawl space has open soil or standing water, fix that first. A dehumidifier cannot dry out a pond.
Wondering about radon in the crawl space? Moisture control and radon are separate problems. Our radon guide explains testing.
How to Size a Crawl Space Dehumidifier
- Measure the area in square feet.
- Note how wet it is. Damp smell only? Visible moisture? Standing water?
- Use the AHAM number (often about 35 pints per day for these units), not the headline 70.
- Add capacity for very wet spaces, or choose a bigger unit.
Need a primer? See our dehumidifier sizing guide.
Drainage: Gravity, Pump, or Both
Gravity drain: the cheapest setup. The hose must run downhill the whole way, to a floor drain or outside. No loops, no sags, no kinks. Our dehumidifier hose guide explains the downhill rule.
Pump: pushes water uphill or across the house. Check the stated lift, and know that pumps are a wear item. See the built-in pump dehumidifier guide.
Installation Tips for Crawl Spaces
- Keep it off wet ground. Hang it from joists with a kit, or set it on blocks.
- Use a safe outlet. Use a GFCI-protected outlet and follow the manual. Ask an electrician if there is no outlet nearby.
- Leave airflow clearance around the unit.
- Set the humidity target and then watch it. Mold risk climbs when humidity sits above about 60 percent.
- Check a hygrometer every week at first. A $10 one is plenty. See how to monitor humidity.
- Clean the filter on the schedule in the manual.
Also check out our guides to basement dehumidifiers and whole-house dehumidifiers if the moisture is not limited to the crawl space.
Crawl Space Dehumidifier Mistakes to Avoid
- Buying by the 70-pint headline. Check the AHAM rating.
- Ignoring the drain plan. Decide how the water leaves before the box arrives.
- Skipping the moisture source. Leaks and open soil beat any machine.
- Setting it and never checking. Look at the hygrometer and the drain every week at first.
- Using a bucket-style unit. Nobody wants to crawl down there every day to empty it.
Frequently Asked Questions
What size dehumidifier do you need for a crawl space?
Many crawl spaces of average size do well with a 35-pint (AHAM) unit, which is what most “70-pint” crawl space models actually are. Wetter or larger spaces need more. Match the unit to the square footage and the moisture level.
Where should you put a dehumidifier in a crawl space?
Near the center or the dampest area, off the ground, with clearance around it, and close to a drain or a pump route. Hanging from joists with a kit keeps it out of any moisture on the ground.
Does a crawl space dehumidifier need to drain outside?
It needs somewhere for water to go. That can be a floor drain, a sump pit, or an exit to the yard. If the route is uphill, use a pump.
Can you use a regular basement dehumidifier in a crawl space?
It can work, but many are too tall and rely on a bucket. Crawl space models are built to run continuously, hang in tight spaces, and drain on their own.
What humidity should a crawl space be?
Keep it under about 60 percent to discourage mold. Many setups aim lower, around 45 to 55 percent. Check the maker’s guidance for your unit.
How long do crawl space dehumidifiers last?
It depends on the model, the dust, and the cleaning. Warranties on the picks above run from five to six years for several brands. Keep the filter clean and the drain clear to get the most out of one.
The Bottom Line: Match the Unit to the Space and the Drain
Most homes do well with a mid-priced 35-pint (AHAM) unit that has both a hose and a pump, like the ALORAIR Helios MP35. Tight budget and a floor drain nearby? Yaufey. Hauling it in and out? The lighter ALORAIR. Long water route? Abestorm. Money no object, or a very low crawl space? AprilAire or Santa Fe.
Whatever you buy, fix the water source first, plan the drain before you buy, and check a hygrometer for the first few weeks.
