Pool Dehumidification CFM Calculator
Evaporation load and airflow for an indoor pool.
Enter your values
ⓘ Live results
Results
- Evaporation rate
- 80 lb/hour
- Latent load
- 84,000 BTU/h
- Ventilation at 6 ACH
- 4,000 CFM
- Outdoor air minimum
- 400 CFM
- Room pressure
- Hold slightly negative to contain chloramines
Quick answer
Indoor pool rooms are sized on water surface evaporation, typically requiring 4-8 air changes per hour.
evaporation ≈ 0.1 x area x activity factor
How to use the Pool Dehumidification CFM Calculator
- 1Measure the water surface area and the room volume.
- 2Choose the activity level — splashing raises evaporation sharply.
- 3Hold the room 2°F above water temperature and slightly negative to neighbouring spaces.
Worked example
Using the values the calculator loads with:
Inputs
- Water surface area800 sq ft
- Room volume40000 cu ft
- ActivityPublic pool (1.0)
Results
- Evaporation rate80 lb/hour
- Latent load84,000 BTU/h
- Ventilation at 6 ACH4,000 CFM
- Outdoor air minimum400 CFM
- Room pressureHold slightly negative to contain chloramines
Frequently asked questions
Why keep air warmer than water?
It slows evaporation dramatically and cuts both latent load and condensation risk.
Dehumidifier or ventilation?
A dedicated pool dehumidifier with heat recovery costs far less to run than dumping heated air outside.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.