AVAHUM Moisture Control Guide
Dehumidifier Capacity & Sizing Chart
Selecting the correct pints-per-day (PPD) rating is crucial for optimal humidity control, energy efficiency, and preventing mold or moisture damage. Match your room size with your humidity level below to find the right capacity.
How to Accurately Size Your Dehumidifier
Calculate Square Footage
Multiply length by width. If your ceilings exceed 8 feet, add 20% to 30% extra capacity to compensate for larger air volume.
Assess Humidity (RH)
Healthy indoor humidity is 45% – 55%. If over 65% or showing condensation, choose a high-capacity commercial unit.
Select Drainage Option
For basements or crawl spaces without floor drains, choose a unit with a built-in pump to lift water up to sinks or windows.
Recommended Dehumidifier Specifications by Space
| Coverage Area | Moisture Condition | Capacity (PPD) | Ideal Applications |
|---|---|---|---|
| Up to 2,000 Sq.Ft | Mild to Moderate (50% – 65% RH) | 30 – 70 PPD | Bathrooms, laundry, master bedrooms, small apartments |
| 2,000 – 3,500 Sq.Ft | Damp / Low Crawl Space (60% – 70% RH) | 113 – 120 PPD | Crawl spaces, mid-size basements, garage workshops |
| 3,500 – 6,500 Sq.Ft | Very Damp / Humid (65% – 75% RH) | 150 – 160 PPD | Large basements, entire residential floor, storage rooms |
| 6,500 – 8,000 Sq.Ft | Extremely Wet / High Infiltration (70% – 85% RH) | 250 PPD | Water damage restoration, commercial basements, gyms |
| 8,000 – 10,000+ Sq.Ft | Constant High Humidity & Industrial | 320+ PPD | Indoor swimming pools, warehouses, industrial construction sites |
Expert Sizing Tip: When in doubt, size up!
A higher-capacity dehumidifier reaches target humidity much faster and cycles off, saving electricity and reducing long-term motor wear. An undersized unit will run continuously without achieving dry conditions, leading to higher electricity bills and premature breakdown.
