Suffering from a hot upstairs living environment, Energy Smart Company installed a solar attic fan to help ventilate the excess heat being built up in the attic.  When an attic is improperly ventilated it becomes excessively hot and that heat eventually transfers into your living environment through conduction.  The customer stated, "My upstairs is easily ten degrees cooler on hot summer days!"  The solar attic fan is backed by a 25 year warranty.