Our most frequently asked question is “why is water in the crawl space or basement a terrible thing?” And the problem isn’t actually the water itself. The problem with an open source of water under the home is the humidity it causes throughout the house.
Over half the air in your home comes directly from your basement or crawl space. Your home acts as giant chimneys, pulling air through the bottom and venting air through the roof. This is called the Stack Effect.
When a crawl space or basement is wet, the incoming air brings with it a very high level of humidity which causes all the building materials in your home to swell. A moist interior air robs your home of its energy-efficiency by accelerating the transfer of energy with the outside world and gives mold, mildew, and all the tiny critters you don’t want in your home an environment within which to thrive.
The short answer: Humidity in the home is a very unhealthy living environment and a killer for your energy efficiency and pocketbook.