Heat flows naturally from a warm place to a cooler space. In the winter, heated air will try to flow to an unheated garage, basement or attic. Conversely, in the warm months, heat will try to flow from the outdoors into the cool interior of the home. The majority of this heat transfer in homes takes place in the attic. With proper insulation, your home will retain heat in cold weather and reject heat in the warm seasons, reducing your energy cost!
It is the role of insulation to prevent this unwanted circulation throughout your home. Combined with proper ventilation and radiant barrier, proper insulation helps your home maintain a comfortable, uniform temperature throughout the year with significantly less use of heating and cooling systems. As a bonus, insulation can also act as a sound absorbent, to help make your home quieter.