Introduction to Controlling Humidity in Natatoriums

Twenty years ago, humidity control for an indoor swimming pool was to bring in outside air while pushing the warm humid air outside with large exhaust fans. This process only worked effectively when the outside air temperature was cool and dry enough to allow for humidity control. This type of system is not only ineffective, but it is the most expensive to operate in a pool enclosure because it cannot consistently maintain the required 50-60% RH humidity levels. When compared to conventional ventilation or "waste ventilation" systems, recycling and dehumidifying pool enclosure air with a mechanical dehumidifier can save 50-75% on energy costs, maintain the 50-60% RH required by ASHRAE, and provide 100% room heating, air conditioning and pool heating.

Read more: Design Guidelines

#1: "It's Just Another Room"
Quite often, pool room dehumidification systems are an "afterthought". Structures are completed without consideration for controlling humidity, ductwork systems, vapor barrier, negative pressure, and mechanical space to name a few. The cost of preventing problems in the design stage is much less than the repair costs down the road.

Read more: 9 Most Common Mistakes When Building An Indoor Swimming Pool