High humidity levels can make people feel sticky and may create a breeding ground for mold, mildew, dust mites and bacteria. It can affect customer comfort, as well as the integrity of computers, building materials and stocked items.
Lennox’ patented Humiditrol® dehumidification system for rooftop units removes up to 8 times more moisture than standard rooftop units and is available for L Series® and S-Class™ rooftop units.
The Humiditrol dehumidification system for split systems provides enhanced humidity and temperature control all in one, and is available for S-Class™ and T-Class™ split systems.
Today’s buildings feature tight construction to reduce the amount of air leakage. While that may reduce sensible cooling loads, moisture levels may actually increase as a result of the minimal exchange with outside air.
Additionally, ASHRAE standards require fresh-air ventilation based on occupancy regardless of outdoor conditions. The result is that when outdoor humidity is high, the latent load will exceed the sensible load, increasing the need for independent humidity control.

*Information from "Humidity Control, IAQ and You" Engineeered Systems magazine.