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Commercial Dehumidifiers for Restoration, Construction, and Facility Drying
Which Technology Handles Your Temperature Range?
Commercial dehumidifiers split into refrigerant, LGR, and desiccant units, and temperature decides which one belongs on a job. Refrigerant units lose efficiency below roughly 65°F, once the coil temperature approaches the dew point of the incoming air and condensation drops off. LGR units pre-cool the incoming air to push that threshold lower. Desiccant units skip the coil entirely and run a silica gel or lithium chloride rotor, which keeps removing moisture at 40°F and below. ASHRAE's standards and guidelines cover the psychrometrics behind the split.
Why Does a 150 PPD Unit Remove Less Than 150 Pints?
Pint-per-day ratings are tested at 80°F and 60% relative humidity under AHAM. Field conditions rarely match the test bench. A unit rated 150 PPD removes closer to 90 to 110 pints in a 60°F basement at 55% RH. Restoration crews working to IICRC S500 size their equipment on air volume and target grain depression, not on the label figure.
Related: Refrigerant Dehumidifiers · Desiccant Dehumidifiers · LGR Dehumidifiers · Industrial Dehumidifiers
What Matters on a Multi-Day Drying Job?
Continuous drainage matters more than tank size once a job runs past a single shift. A gravity hose or a built-in condensate pump removes the overnight stop to empty a tank. Power is the other constraint. Portable LGR units pull 6 to 12 amps, so two of them on one 15-amp circuit will trip it. EPA guidance on water damage puts the structural drying window at 24 to 48 hours.
Frequently Asked Questions
Free Sizing Tools
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Dehumidifier Sizing Calculator
Enter room size and conditions to get the right pints-per-day capacity for your space.
Use the calculator →Air Scrubber Calculator
Match CFM and air changes per hour to your room for mold, dust, and restoration jobs.
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Size a walk-behind or ride-on scrubber to your floor area and cleaning schedule.
Use the calculator →Water Damage Equipment Calculator
Plan how many air movers and dehumidifiers a water-loss job needs, by class and size.
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