Method and apparatus for controlling humidity and mold

An apparatus for reducing a relative humidity of inside air inside an enclosed space, the apparatus comprising:

• a portable outside air heat exchanger unit comprising:
• a fan operative to create an air stream by drawing air from an intake and discharging the air through an outlet;
• a temperature adjusting element located in the air stream between the intake and the outlet;
• wherein the intake is adapted to draw air from outside the enclosed space and the outlet is adapted to discharge the air stream into the enclosed space;
• a heating source connectable to the heat exchanger unit and operative to supply heat energy to the temperature adjusting element in response to directions from a heat controller;
• at least one humidity sensor operative to sense the relative humidity of the air in a sensing location and to send a humidity signal to the heat controller;
• wherein the heat controller is operative to receive the humidity signal and change the amount of heat energy supplied to the temperature adjusting element in response to the humidity signal.