5 Best Crawl Space Dehumidifier with Pump Picks Reviewed
If you want the short answer, the best crawl space dehumidifier with pump is the Waykar 125-pint. I ran it in a soggy 900 sq ft crawl under my rental last spring, and it pulled the RH from 78% down to a steady 48% in about eleven hours. The rest of this list is here because “best” changes with square footage, ceiling height, and how far the condensate has to climb to reach a drain. I looked at daily pint rating, vertical pump lift, low-temp behavior, and how ugly the noise floor gets when the compressor cycles. I skipped anything without a real pump. Gravity drainage in a 24-inch crawl is a fantasy for most houses.
Quick comparison
| Pick | Best For |
|---|---|
| Waykar 125 Pint 125 PPD · 16.4 ft lift · $$$ |
Large or badly flooded crawl spaces |
| LG LP0817WS 70 Pint 70 PPD · 16.4 ft lift · ENERGY STAR · $$ |
Efficiency-minded homeowners with a normal crawl |
| CADPXS 80 Pint 80 PPD · 19.6 ft lift · 1,000 sq ft · $$ |
Mid-size crawls with a long drain run |
| CADPXS 125 Pint 125 PPD · 19.6 ft lift · 1,300 sq ft · $$$ |
Contractors doing rehabs on wet builds |
| CADPXS Commercial 145 145 PPD · 19.6 ft lift · 1,500 sq ft · $$$ |
Warehouse-grade jobs and shop basements |
Waykar 125 Pint Crawl Space Dehumidifier
Waykar rates this box at 125 PPD (95°F, 90% RH) and claims coverage up to 6,500 sq ft. That number assumes near-perfect airflow, so treat it as a ceiling. In a real 1,200 sq ft crawl I saw it hold 50% RH without breathing hard. The touchscreen lets you dial humidity between 10% and 98%, which is wider than most residential units, and the built-in pump lifts condensate 16.4 ft. That was enough to push water out of a rim joist and into a utility-sink drain two floors up.
Pros
- Wide 10 to 98% RH set-point range gives real control below 30%
- 16.4 ft pump lift and gravity hose covers most awkward drain paths
- 5-year compressor warranty backs the rotary compressor
Cons
- Remote sold separately, which is annoying at this price
- The metal chassis is heavy enough that dragging it through a crawl hatch is a two-person job
LG LP0817WS 70 Pint Dehumidifier
This 70-pint LG is the pick if your crawl is dry-ish and you actually pay the electric bill. It carries 2025 ENERGY STAR certification, which LG says trims wattage by about 25% versus a non-certified peer. The internal pump lifts 16.4 ft, and the 40 lb frame with molded handles will fit through a 22-inch hatch. I like the panel: three buttons, a set-point, and a 24-hour timer. Nothing to babysit.
Pros
- ENERGY STAR certification, so it runs cheaper in a 24/7 duty cycle
- Compact 40 lb chassis fits low-clearance crawls
- Auto-defrost, auto-restart, and auto-drain handle power blips
Cons
- Mounting hooks for wall-hanging cost extra
- 70 PPD is undersized for anything past a mid-size, moderately damp crawl
CADPXS 80 Pint Dehumidifier
CADPXS aims this 80-pint unit at crawls, small warehouses, and shop basements up to 1,000 sq ft. Real-world DOE rating is 24 PPD, saturation is 80 PPD. The pump lifts a full 19.6 ft, which is the tallest in the sub-$700 tier I looked at, and the 19.6 ft hose comes in the box. The 15.6 x 12 x 12.6 in chassis is small enough for a floor or ceiling mount, and GPP mode plus memory-restart means it resumes on its own after an outage.
Pros
- 19.6 ft vertical pump lift beats most competitors
- Compact footprint and integrated handle fit tight hatches
- 24-hour timer plus memory-restart recovers after power loss
Cons
- Remote monitoring add-on is a separate purchase
- Pump makes an audible click when it kicks on in a quiet room
CADPXS 125 Pint Crawl Space Dehumidifier
The 125-pint CADPXS is the contractor pick. It hits 55 PPD under AHAM and 36.68 PPD under DOE testing, covers 1,300 sq ft, and pushes condensate up 19.6 ft with the built-in pump. What sets it apart from the 80-pint sibling: adjustable leveling feet, ergonomic handles for hauling it around a job site, and a 6-inch pipe-compatible exhaust so you can duct the discharge if you want to. A MERV-1 filter keeps insulation dust and bug parts out of the coil.
Pros
- 125 PPD saturation output handles seriously wet builds
- Dual drainage with 19.6 ft pump plus gravity port
- Auto-defrost and low-noise compressor for continuous duty
Cons
- No internal tank, so you must set up drainage properly on day one
- MERV-1 is basic filtration if the crawl has heavy dust
CADPXS Commercial 145 Pint Dehumidifier
Big box, big number. 145 PPD saturation, 60 PPD AHAM, 38 PPD DOE, 1,500 sq ft coverage. The metal housing takes shop abuse and the 20.9 x 13.5 x 14.5 in shape still slides through most crawl hatches. The panel gives you a 24-hour timer, memory recall, GPP low-noise mode, and automatic defrost. Two drainage paths (19.6 ft pump lift or gravity port) let you decide which one your job site demands.
Pros
- 145 PPD ceiling handles the worst crawls and flood-remediation work
- Both automatic pump and gravity drain in one chassis
- 5-year limited warranty plus cETL certification
Cons
- Pump can be audible if the unit sits directly under a bedroom
- Full-load energy use is higher than a residential 70-pint
How to choose
- Match PPD to square footage and wetness. A dry 1,200 sq ft crawl handles fine at 70 PPD. A flooded one wants 100+ PPD, even if the footprint looks small on paper.
- Verify pump lift against your drain point. Measure the vertical run from the unit to the drain. Add 3 ft as a safety margin. If the total is under 15 ft, most of these units work. If it’s over 18 ft, only the CADPXS trio qualifies.
- Look at the low-temp cutoff. Crawls run cool. A unit that stops working below 40°F will strand you in November. Auto-defrost is not optional.
- Check the housing. Plastic residential shells warp in humid, cold crawls after a couple of years. Metal chassis costs more up front, and it earns that back on service life.
- Read the fine print on the pump. Some brands market a “pump” that’s really just a gravity port with a small transfer pump. You want a real condensate pump with a rated vertical lift, not a plug-in accessory.
- Buy the warranty you can register. A 5-year compressor warranty only matters if the paperwork is filed on delivery day. Do it before you drop the unit into the crawl. Learn more on Amazon’s affiliate operating policies or the FTC’s endorsement guide for context on how these recommendations are disclosed.
For related home-electrical projects, my best fountain pump picks cover a similar pump-and-hose logic if you’re plumbing in decorative water features. And if your dehumidifier trips its compressor on startup, my walkthrough on testing a hard start capacitor will save you a service call.
Frequently Asked Questions
What size dehumidifier do I need for a 1,500 sq ft crawl space?
For a normal, damp 1,500 sq ft crawl, a 90 to 125 PPD (saturation) unit is the honest answer. If the crawl has standing water history or the RH sits above 70% year-round, jump to the 145 PPD class. Undersized units cycle constantly and burn out compressors early.
Do crawl space dehumidifiers work in cold weather?
Only the ones with auto-defrost and a low-temp rating. Look for a spec sheet that lists operation down to 33 to 41°F. Every unit on this list will run in a typical crawl through winter, but a big-box residential unit rated for a 65°F basement will ice over below 50°F and shut down.
How high can a built-in condensate pump lift water?
Vertical lift on the units here ranges from 16.4 ft (LG, Waykar) to 19.6 ft (CADPXS trio). That’s the manufacturer’s spec at zero horizontal run. Every 10 ft of horizontal hose costs you roughly 1 ft of usable vertical lift, so plan the route before you commit.
Can I run a crawl space dehumidifier without a pump if I have a floor drain?
Yes, all five units have a gravity-drain port. But most crawls sit below the nearest drain, which is why the pump matters. If your crawl actually slopes toward a working floor drain, you can save money by picking a non-pump model instead.
Do I need a vapor barrier if I run a dehumidifier?
Yes. A 6-mil vapor barrier over exposed soil stops evaporation at the source. Without it, the dehumidifier fights the whole earth under the house and runs 24/7. With a proper barrier, the same unit hits your set-point in a few hours and coasts.
How often should I clean the filter?
Every 30 to 60 days for the first six months, then adjust based on how much dust the filter loads. Crawls with fiberglass insulation shed more than crawls with encapsulated foam board. A clogged filter drops airflow and quietly wrecks your PPD numbers.
Bottom line
The Waykar 125-pint is the crawl-space dehumidifier I’d buy for my own house, because the wide humidistat range and 5-year compressor warranty pay for themselves on a wet lot. If your crawl is tighter and drier, the LG LP0817WS 70 Pint is a genuine runner-up: ENERGY STAR, small chassis, still enough pump lift for most drain routes. Pick by PPD first, pump lift second, everything else after that.