A successful dehumidification system is comprised of two critical components: a dehumidifier appropriate for the particular application, which is dependent on a long list of parameters, and proper ductwork system installation. Without proper air flow through the dehumidifier and room being dehumidified, required space conditions cannot be achieved.



Proper dehumidification system installation requires two more components in addition to the proper ductwork noted above: first, a consistent power source at the correct voltage and phase, and second, properly installed refrigerant connections between the dehumidifier and remote condenser.

Refer to the installation and service manual provided with your dehumidifier system to ensure that these components are each properly installed.

To maximize the efficiency of a dehumidification system, the ductwork must be well-designed and suited for the specific dehumidification system at hand. Outlined below are some of the main considerations to keep in mind when designing and installing ductwork for a successful dehumidification system.


Poorly designed or incorrectly sized ductwork can lead to dead air movement areas where moisture collects, causing corrosion and potentially dangerous structural weakness. Such environments also foster mold, mildew, dust mites, bacteria, and viruses, all of which have adverse — sometimes serious — effects on people’s health and wellbeing.

Ductwork that is poorly designed or sized can also result in damaging conditions, such as high head pressures or liquid floodback that can destroy a compressor. Both of these issues can void coverage under warranty.

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When designing your system, start by ensuring the supply air will cover all exterior surfaces and specifically target locations where humidity causes the most problems, such as outside facing glass windows, skylights, and patio doors. Also, keep in mind that the ducting through unconditioned spaces requires the duct to be externally insulated.

However, in indoor pool rooms, the supply air must not be directed onto, but rather over, the water surface of the pool in limited amounts. Blowing air across an open indoor pool is not recommended in values over 30 fpm as it can increase the evaporation rate of the water, have a “chill effect” on patrons, and increase operating costs. However, it is still important for air quality and health reasons.

Good air distribution in a pool room environment is critical; providing proper mixing in the space helps prevent condensation, corrosion, and stratification. With adequate amounts of fresh air, proper ventilation, and sufficient supply air delivery rates, you can create a healthy and durable environment.