Crawl Space Dehumidifier with Pump
Most crawl space dehumidifiers require upward drainage routing. Among the brands we compare, the AlorAir Sentinel HDi90 ($975.04) and Argendon's pump models (Guardian 60P, Shield 60P, Sandidry 55C, Shield 35P) include a built-in condensate pump. Santa Fe and AprilAire models require external pump add-ons costing $200–$300.
Quick answer: If you need upward drainage, buy the AlorAir Sentinel HDi90 with integrated 19.7 ft pump. It's cheaper than buying any competitor plus external pump.
Why Crawl Spaces Need Pumps
Drain Line Must Run Upward
Crawl space dehumidifiers are installed at the lowest point. Drain lines typically route upward to exit at foundation level or connect to plumbing. Gravity drainage only works when outlet is below unit — rarely the case in crawl spaces.
No Floor Drain Available
Most crawl spaces lack floor drains. Condensate must be pumped up and out, not drained by gravity into a sump pit.
Pump Lift Requirements
Typical crawl space requires 5–15 ft vertical lift from dehumidifier to exit point. Some installations need 15–20 ft for long horizontal runs plus vertical rise. Built-in pump eliminates need for separate pump purchase and installation.
Models with Built-in Pumps
AlorAir Sentinel HDi90 — $975.04
Pump Specs: 19.7 ft vertical lift, 50+ ft horizontal run capability
AHAM Capacity: 90 pints/day
Min Operating Temp: 33.8°F
Verdict: Best value. Pump included in base price. No external pump needed.
Argendon Pump Models — See argendon.com for price
Argendon lists a built-in condensate pump and a 19.6 ft pump drain hose on these models; the product pages say water can be directed up to 19.6 feet. Each also ships with a 6.5 ft gravity drain hose. Specs are from each argendon.com product page (fetched 2026-09-29).
| Model | AHAM PPD | Saturation PPD | Coverage | Min Operating Temp | Pump Hose | Link |
|---|---|---|---|---|---|---|
| Argendon Guardian 60P | 60 | 145 | 1,800 sq ft | 33.8°F | 19.6 ft | See today's price |
| Argendon Shield 60P | 60 | 145 | 1,800 sq ft | 35.6°F | 19.6 ft | See today's price |
| Argendon Sandidry 55C | 55 | 120 | 1,300 sq ft | 33°F | 19.6 ft | See today's price |
| Argendon Shield 35P | 35 | 70 | 1,000 sq ft | 33°F | 19.6 ft | See today's price |
Verdict: These are 35–60 AHAM PPD units rated for 1,000–1,800 sq ft, smaller than the 90 PPD HDi90. They are a fit for small and mid-size crawls that need a pump. Gravity-only versions (Guardian 60, Shield 60, Shield 35M) are also available.
See all Argendon crawl space dehumidifiers →
AlorAir Sentinel HD90 — No Pump
Identical to HDi90 but gravity drain only. If gravity drainage is available, this model costs less. For upward drainage, choose HDi90 rather than adding external pump later ($200–$300).
Models Requiring External Pumps
Santa Fe Advance90 — See retailers + $200–$300 pump
Pump Installation: Separate Little Giant, Hartell, or similar condensate pump required. Requires separate power connection, float switch, and plumbing.
Verdict: Premium brand but expensive when pump is required. Consider AlorAir HDi90 for lower total cost.
AprilAire E-Series — See retailers + $200–$300 pump
Pump Installation: Requires external condensate pump. AprilAire sells compatible pump kits or use third-party Little Giant/Hartell pumps.
Verdict: Made-in-USA option. Only justified for HVAC integration or domestic manufacturing requirement.
AprilAire vs AlorAir comparison →
Cost Comparison with Pump
| Model | Base Price | Pump Status | Total with Pump |
|---|---|---|---|
| AlorAir HDi90 | $975.04 | Built-in (19.7 ft) | $975.04 |
| Argendon Guardian 60P | See argendon.com | Built-in (19.6 ft pump hose) | See argendon.com |
| Argendon Shield 60P | See argendon.com | Built-in (19.6 ft pump hose) | See argendon.com |
| Argendon Sandidry 55C | See argendon.com | Built-in (19.6 ft pump hose) | See argendon.com |
| Argendon Shield 35P | See argendon.com | Built-in (19.6 ft pump hose) | See argendon.com |
| AlorAir HD90 | See alorair.com | Add external pump | See retailer + $250 pump |
| Santa Fe Advance90 | See retailers | Add external pump | See retailer + $250 pump |
| AprilAire E-Series | See retailers | Add external pump | See retailer + $250 pump |
External Pump Installation
Compatible External Pumps
- Little Giant VCMA-20ULS — $180–$220, 20 ft lift, safety switch
- Hartell Mighty Mite — $160–$200, 18 ft lift, compact design
- AprilAire Pump Kit — $250–$300, branded for AprilAire but works with others
Installation Requirements
- Separate power: Pump needs dedicated outlet near dehumidifier
- Reservoir tank: Condensate drains to pump reservoir before pumping
- Float switch: Pump activates when reservoir fills to set level
- Discharge tubing: 3/8" or 1/2" vinyl tubing from pump to exit point
- Mounting: Pump must be below dehumidifier drain outlet
External Pump Disadvantages
- Adds $200–$300 to project cost
- Requires separate power outlet
- More complex installation (plumbing, mounting, wiring)
- Additional maintenance point (pump can fail independently of dehumidifier)
- Takes up floor space in already-cramped crawl space
Built-in Pump Advantages
Lower Total Cost
AlorAir HDi90 at $975.04 with built-in pump offers excellent value compared to competitors requiring external pump add-ons.
Simpler Installation
One power connection, one drain line. No separate pump mounting, reservoir plumbing, or float switch adjustment.
Space Savings
Integrated pump eliminates separate pump unit and reservoir tank on crawl space floor.
Single Point of Maintenance
One warranty, one service call if issues arise. External pump failures require separate troubleshooting and repair.
Auto Restart After Power Loss
Built-in pump restarts with dehumidifier. External pumps may need separate restart or float switch reset.
When Gravity Drain Works
Save with AlorAir HD90
If your drain line runs downward from dehumidifier to exit point (rare), you don't need a pump. Buy AlorAir Sentinel HD90 (gravity drain model) instead of HDi90.
Gravity Drain Requirements
- Exit point (sump pit or drain) is below dehumidifier drain outlet
- Continuous downward slope (minimum 1/4" per foot) along entire drain line
- Short run (under 20 ft) — longer runs may have insufficient flow even with slope
Most Crawl Spaces Need Pumps
Over 80% of crawl space installations require upward drainage. Unless you have confirmed gravity drainage capability, plan for pump requirement.
Pump Performance Specifications
AlorAir HDi90 Built-in Pump
- Vertical Lift: 19.7 ft maximum
- Horizontal Run: 50+ ft capability (varies with vertical component)
- Discharge Connection: 3/8" barb fitting for vinyl tubing
- Activation: Float switch activates pump when internal reservoir fills
- Safety Shutoff: Unit shuts down if pump fails or drain line clogs
Typical External Pump (Little Giant VCMA-20ULS)
- Vertical Lift: 20 ft maximum
- Horizontal Run: Varies, typically 50–75 ft
- Reservoir: 1-gallon capacity before pump activates
- Power: Separate 115V outlet required
- Safety Switch: Optional overflow shutoff for dehumidifier
Recommendation
For any crawl space requiring upward drainage (80%+ of installations), the AlorAir Sentinel HDi90 is the best choice. It includes a built-in pump and eliminates external pump installation complexity.
For smaller crawls, Argendon's Guardian 60P and Shield 60P (60 AHAM PPD, rated for 1,800 sq ft per argendon.com) also include a built-in pump. See the Argendon pump models above.
Only consider external pump options if:
- You specifically need Santa Fe's MERV-13 filter or 6-year warranty
- You specifically need AprilAire's HVAC integration or Made-in-USA manufacturing
Buy AlorAir HDi90
Check availability at alorair.com →
Related Guides
- AlorAir Sentinel HDi90 Full Review
- AprilAire vs AlorAir — with pump cost comparison
- Total Cost Analysis — including pump costs
- Best Crawl Space Dehumidifier 2026
We may earn a commission from AlorAir and Argendon via Awin when you use our links; it does not change the price. Other brands remain unsponsored. Prices verified 2026-10-16; Argendon specs fetched from argendon.com 2026-09-29.