To increase the surface temperature, insulate or increase the circulation of heated air. To reduce moisture levels in the air, repair leaks, increase ventilation (if the outside air is cold and dry), or dehumidify (if outdoor air is warm and humid).
A little maintenance is called for, including keeping heating, ventilation, and air-conditioning (HVAC) drip pans clean, flowing properly, and unobstructed. You also should vent moisture-generating appliances, such as dryers, to the outside.
By doing both, you’ll be better able to reach the recommended maximum indoor humidity of 60 percent, although it would be better if it ranged between 30 percent and 50 percent.
Don’t allow the foundation of your house to remain wet. One way to solve this problem is to provide adequate drainage by grading, or sloping the ground away from the house.
You need to find ways to increase ventilation so that the interior air pressure is higher than the outside pressure, so that moisture and mold flow out rather than in. Make sure that your heating, air-conditioning, and ventilation system is properly sized for the house.
When you add on, you’ll need to make sure that the size of the system grows to accommodate it. When you add ductwork, have the existing ductwork cleaned.
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