6 Best Crawl Space Dehumidifiers Under $400 of 2026
We compared six crawl space dehumidifiers under $400 on capacity, drainage and warranty.
By Daniel Brooks
Updated October 28, 2026
You do not need to spend thousands to protect a crawl space. Our list of the best crawl space dehumidifiers under $400 compares six units on AHAM capacity, drainage and warranty.
Every model here was listed under the price cap when we compared them. Prices change often, so check the product cards for the current price.
All Products Compared
| Product | Best For | Capacity | Coverage | Drainage | Notable |
|---|---|---|---|---|---|
| ALORAIR Sentinel HS35 Dehumidifier | Overall | 70 pints saturation, 35 PPD AHAM | Up to 1,000 sq ft | 6.5 ft gravity hose | Manual knobs, 115 CFM |
| Fnova 145 Pint Dehumidifier with Pump | High capacity | 145 pints at 95 F, 90% | Up to 1600 sq. ft | Pump 16.4 ft or 6.56 ft gravity | Joist mounting, washable filter |
| Argendon Sandidry Pro 35C Dehumidifier | Energy Star | 70 pints saturation, 35 pints AHAM | Up to 1,000 sq ft | Pump, 19.6 ft hose | Energy Star Most Efficient 2025 |
| CADPXS 125 Pint Crawl Space Dehumidifier | 125-pint gravity | 125 pints, 60 PPD AHAM | Up to 1500 Sq Ft | 6.56 ft gravity hose | Memory restart |
| Airecoler Stellar S10 Dehumidifier | Remote panel | 70 pints max | Up to 1,000 sq ft | Gravity hose | Energy Star, detachable control panel |
| BaseAire 70 PPD Dehumidifier with Pump | Digital panel | 70 PPD | Up to 1000 Sq Ft | Pump | Digital panel, hanger option |
| Award | Product | WikiCooling Score About WikiCooling ScoreThe WikiCooling Score is our own rating from 0 to 10, based on the criteria described on our How We Review page. It reflects research, not laboratory measurement, and is never influenced by manufacturers, retailers, or affiliate commissions. Learn more › | |
|---|---|---|---|
| Best Value |
ALORAIR Sentinel HS35 Dehumidifier
|
Buy | |
Fnova 145 Pint Dehumidifier with Pump
|
Buy | ||
| Best Premium |
Argendon Sandidry Pro 35C Dehumidifier
|
Buy | |
CADPXS 125 Pint Crawl Space Dehumidifier
|
Buy | ||
| Best Overall |
Airecoler Stellar S10 Dehumidifier
|
Buy | |
| Best Budget |
BaseAire 70 PPD Dehumidifier with Pump
|
Buy |
Top 3 Crawl Space Dehumidifiers Under $400 Reviewed
#1 ALORAIR Sentinel HS35 Dehumidifier: Best Overall
Why We Picked It
ALORAIR’s Sentinel HS35 is a compact 70-pint crawl space unit with simple manual knobs, 115 CFM of airflow and a 6.5 ft drain hose, sized for spaces up to 1,000 sq ft.
The HS35 is ALORAIR’s entry crawl space dehumidifier. It removes 35 PPD under AHAM conditions and up to 70 pints a day at saturation, moving 115 CFM of air through spaces up to 1,000 sq ft. The 6.5 ft hose drains continuously by gravity, so there is no tank to empty, and an ergonomic handle makes it easy to slide into place. Humidity is set with manual knobs, which some installers prefer because there is nothing to reprogram after an outage. Auto defrost keeps it running in cool conditions, and it carries ALORAIR’s 6-year limited warranty.
Key Specifications
- Capacity: 70 pints at saturation, 35 PPD at AHAM
- Coverage: Up to 1,000 sq ft
- Airflow: 115 CFM
- Drainage: 6.5 ft gravity hose
- Controls: Manual knobs
- Size and Weight: 15.35 x 11.2 x 11.4 inches, 37.8 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
Several brands sell a very similar 70-pint body. ALORAIR stands out for its warranty and support.
Best For
This dehumidifier is best for small crawl spaces and closets under stairs.
Check the current price and availability of the ALORAIR Sentinel HS35 Dehumidifier on Amazon.
Read our full ALORAIR Sentinel HS35 Dehumidifier review.
#2 Fnova 145 Pint Dehumidifier with Pump: Best High Capacity
Why We Picked It
Fnova’s 145-pint unit brings pump drainage, joist mounting and a washable filter to a price well below most 145-pint rivals.
The Fnova removes up to 145 pints a day at 95 degrees F and 90% humidity and covers up to 1600 sq ft. It drains two ways: a pump that sends water up to 16.4 ft, or a 6.56 ft gravity hose. At 22.05 x 14.37 x 13.58 inches, it fits narrow basements, and it can stand on the floor, sit on a table or hang between floor joists. Set the target humidity and it runs on its own, with auto defrost and a timer shutdown.
Key Specifications
- Capacity: 145 pints at 95 degrees F, 90% RH
- Coverage: Up to 1600 sq ft
- Drainage: Pump (16.4 ft) or 6.56 ft gravity hose
- Installation: Floor, tabletop or between joists
- Filter: Washable
- Weight: 60.3 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
Without an AHAM rating, its real-world output is harder to compare.
Best For
This dehumidifier is best for large crawl spaces on a budget.
Check the current price and availability of the Fnova 145 Pint Dehumidifier with Pump on Amazon.
#3 Argendon Sandidry Pro 35C Dehumidifier: Best Energy Star
Why We Picked It
Argendon’s Sandidry Pro 35C is certified ENERGY STAR Most Efficient 2025 and includes a pump with a 19.6 ft hose, auto restart and a safety lock.
The Sandidry Pro 35C removes up to 70 pints a day at 90 degrees F and 90% humidity, and 35 pints at the 80 degree F, 60% AHAM condition, in spaces up to 1,000 sq ft. Its ENERGY STAR Most Efficient 2025 rating means it uses less power for the same water removed. A built-in pump and 19.6 ft hose drain it continuously, auto defrost keeps it running in cold weather, it restarts after outages, and a safety lock stops accidental setting changes. Argendon backs it with a 5-year warranty.
Key Specifications
- Capacity: 70 pints at saturation, 35 pints at AHAM
- Coverage: Up to 1,000 sq ft
- Certification: ENERGY STAR Most Efficient 2025
- Drainage: Pump with 19.6 ft hose
- Extras: Auto restart, safety lock
- Warranty: 5 years
| Pros | Cons |
|---|---|
|
|
Things to Consider
Check the height of your crawl space; this body is 14 inches tall.
Best For
This dehumidifier is best for basements and taller crawl spaces.
Check the current price and availability of the Argendon Sandidry Pro 35C Dehumidifier on Amazon.
Read our full Argendon Sandidry Pro 35C Dehumidifier review.
Other Models Worth Considering
CADPXS 125 Pint Crawl Space Dehumidifier. CADPXS’s 125-pint unit lists 60 PPD at AHAM and 37 PPD at the cooler DOE condition.
Airecoler Stellar S10 Dehumidifier. Airecoler’s Stellar S10 has a detachable control panel that works as a wired remote.
BaseAire 70 PPD Dehumidifier with Pump. BaseAire’s 70 PPD unit adds a digital panel and an optional hanger for suspension.
What to Expect from Crawl Space Dehumidifiers Under $400
Crawl space and whole-house dehumidifiers are built to run for months without attention. There is no bucket: water leaves through a gravity hose or a built-in pump, the coils are protected against corrosion, and auto defrost keeps them working in cool, damp spaces where a household unit would ice up and stop.
For more options, see our guides to crawl space dehumidifiers under 500 and 70-pint crawl space dehumidifiers. For single rooms, our portable compressor dehumidifiers guide covers bucket models. The product cards show the current price for each dehumidifier.
How to Choose Crawl Space Dehumidifiers Under $400
Compare AHAM Ratings, Not Saturation Numbers
Most listings quote two capacities. The big number is measured at saturation, around 90 degrees F and 90% humidity, conditions a crawl space rarely sees. The AHAM figure, measured at 80 degrees F and 60% humidity, is far more useful for comparing units, and it is usually about half the saturation number.
Seal the Space Before You Dehumidify
A dehumidifier in a vented crawl space ends up drying the outdoors. Close vents, lay a sealed vapor barrier and fix gutters and grading first; the dehumidifier then only has to handle what is left.
Plan the Drainage First
A gravity hose works when a floor drain, sump or exterior opening sits lower than the unit. If water has to go up and out, through a rim joist or to a basement sink, choose a model with a built-in condensate pump and check its lift height.
Check the Warranty
These units are an investment, and warranties vary from one to six years or more. A long warranty from a brand with US support is worth paying for when the unit will live where you rarely see it.
How We Evaluate Crawl Space Dehumidifiers Under $400
We rank dehumidifiers on manufacturer specifications and listing details: rated capacity and the conditions behind it, coverage, drainage, efficiency, build and warranty. We kept only new, in-stock units and left out renewed listings and bucket-style household models. For this list we kept only new, in-stock units listed under the price cap, then weighed capacity, drainage and warranty.
Frequently Asked Questions
What size crawl space dehumidifier do I need?
For a sealed crawl space, a unit rated around 35 PPD at AHAM suits smaller homes and about 55 PPD larger ones. Wet or vented spaces need more.
What humidity should a crawl space be?
Most experts aim for 45% to 60%. Below that wastes energy; above it invites mold and wood rot.
Do I need a pump?
Only if there is no drain lower than the unit. Otherwise a gravity hose is simpler and has no pump to fail.
How much does a crawl space dehumidifier cost to run?
It depends on capacity, efficiency and how often it cycles. ENERGY STAR units and a sealed crawl space both cut running time.
Final Verdict
The ALORAIR Sentinel HS35 Dehumidifier is the best crawl space dehumidifier under $400, with a 6-year warranty. For the most capacity, choose the Fnova 145 Pint Dehumidifier with Pump, and for efficiency, the Argendon Sandidry Pro 35C Dehumidifier.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.