Crawl Space Dehumidifier with Pump
Most crawl space dehumidifiers require upward drainage routing. Only AlorAir Sentinel HDi90 includes a built-in condensate pump ($1,147). 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 — $1,147
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.
AlorAir Sentinel HD90 — $1,047 (No Pump)
Identical to HDi90 but gravity drain only. Save $100 if gravity drainage is available. For upward drainage, spend the extra $100 for HDi90 rather than adding external pump later ($200–$300).
Models Requiring External Pumps
Santa Fe Advance90 — $1,300–$1,600 + $200–$300 pump
Total Cost: $1,500–$1,900 with external 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 $350–$750 less.
AprilAire 1850 — $2,236 + $200–$300 pump
Total Cost: $2,436–$2,536 with external pump
Pump Installation: Requires external condensate pump. AprilAire sells compatible pump kits or use third-party Little Giant/Hartell pumps.
Verdict: Most expensive option. Only justified for HVAC integration or Made-in-USA requirement.
AprilAire vs AlorAir comparison →
AprilAire 1870 — $2,496 + $200–$300 pump
Total Cost: $2,696–$2,796 with external pump
High Capacity: 130 pints/day for large crawl spaces (up to 7,200 sq ft)
Verdict: Highest capacity but very expensive. Only needed for 3,000+ sq ft crawl spaces.
Cost Comparison with Pump
| Model | Base Price | Pump Status | Total with Pump |
|---|---|---|---|
| AlorAir HDi90 | $1,147 | Built-in (19.7 ft) | $1,147 |
| AlorAir HD90 | $1,047 | Add external pump | $1,247–$1,347 |
| Santa Fe Advance90 | $1,300–$1,600 | Add external pump | $1,500–$1,900 |
| AprilAire 1850 | $2,236 | Add external pump | $2,436–$2,536 |
| AprilAire 1870 | $2,496 | Add external pump | $2,696–$2,796 |
Savings with AlorAir HDi90: $353–$1,649 compared to competitors with external 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 $1,147 with built-in pump costs less than any competitor even before adding external pump cost.
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 $100 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 for $1,047 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 at $1,147 is the best choice. It costs less than competitors before pump add-ons and eliminates external pump installation complexity.
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
- You're willing to pay $350–$1,400 premium for those features
Buy AlorAir HDi90
See today's price 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
No affiliate relationships. All links rel="nofollow". Prices verified August 30, 2026.