FullCalculator

Dehumidifier Sizing Calculator

Room Dehumidifier Size

Calculate dehumidifier capacity for a space

Formula

Capacity based on AHAM sizing guidelines: area x dampness level + appliance additions

Frequently Asked Questions

What size dehumidifier do I need?
For a moderately damp 500 sq ft space, you need about 12 pints/day capacity. For a very damp 1000 sq ft basement, about 20 pints/day. Add 5 pints if you have a washer/dryer in the space.
What humidity level should I target?
Aim for 30-50% relative humidity. Below 30% can cause dry skin and static. Above 50% promotes mold growth. For basements, 40-50% is ideal.

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