According to EPA estimates, heating and air conditioning accounts for anywhere from 43% to 60% of the average monthly electricity bill – by far the largest chunk in comparison to any other appliance. Since we dedicate so much energy (and hence money) to heating and cooling our homes, it is vital to make sure that this treated air stays inside the building. One effective way to do this is through home insulation. DOE Link The U.S. Department of Energy estimates that only 20% of homes built before 1980 have proper insulation. Cracks or gaps in walls, corners, floors, or roofs, as well as insulation that is too thin, can all allow heated or cooled air to leak out of the home. The attic is a particular culprit when it comes to wasting energy. The DOE recommends that attic insulation in all regions of the U.S. have an R-value of at least R-30, ranging up to R-60. The specific thickness of insulation you need will depend on climate and building design. ...