There is nothing in the home quite like the damp odor that engulfs a person walking into a room with an over abundance of humidity breeding mold and mildew. Not only is is offensive to the nose, it can become very unhealthy.
Fresh, dry air is the solution to the problem, but weather conditions and energy conservation don't always allow for the exchange of good air.
An easy fix is as simple as the installation of one or more de-humidifiers. By reducing the moisture in the air, mold and mildew along with other nasty things that breed in too humid an environment can be eliminated.
De-humidifiers that use a refrigeration cycle to condense moisture from the air are the most common for the home.
Dessicant units that use a moisture absorbing medium to collect water then dispose of it with heated or dry air passing across the medium are used on a commercial level or for indoor pools and very large homes.