Dehumidifier sizing calculator

Commercial Dehumidifier Sizing Calculator

Size a commercial dehumidifier from area, current RH, target RH, temperature, moisture source, drainage, and duty cycle before model selection.

Commercial Dehumidifier Sizing Calculator: Estimate the capacity class from area, current RH, target RH, temperature, moisture source, drainage, duty cycle, and service access. The result is an early selection range, not a guaranteed final RH outcome.

Updated 2026-07-06

RH humidity context Pts pints/day class Temp operation range Drain condensate path

Moisture load, temperature, drainage, and duty cycle can change product selection.
The result does not promise final RH or moisture performance.

Capacity class = area / 500 x 18 x dampness factor.

Commercial dehumidifier capacity class = area / 500 x 18 x dampness factor. The same square footage can need a different path when current RH, target RH, moisture source, temperature, drainage, or duty cycle changes.

Area: Space area in square feet.
Base rate: 18 pints/day per 500 sq ft.
Dampness factor: Mild 1.0, moderate 1.45, heavy 1.9.

Normalize the space to 500 sq ft blocks.
Apply the base pints/day planning rate.
Multiply by dampness severity and round upward to a practical class.

AdjustmentRounded up to the next 5 pints/day sizing class.

OutputStarts dehumidifier selection before drainage and duty cycle checks.

BoundaryThe result is not a final RH promise; low temperature, water intrusion, air leakage, drainage, and ventilation overlap can change the equipment path.

Carry Forward

Moisture source

Visible dampness, stored materials, showers nearby, or water entry can change the sizing path.

Describe the source, not just area.

Dehumidifiers Dehumidifier Size Chart Basements and Storage Rooms Datasheet guide Request model documents

Dehumidifier result should open a moisture-control review with drainage, temperature, duty cycle, and ventilation overlap attached.

Air Curtain Series

Ventilation Fan Types

Fresh Air Systems

Exhaust Fan Options

Dehumidifier Options

Commercial Dehumidifier Sizing Calculator

Recommended next step

Moisture source