No matter what we tried our house was losing heat in the winter, and was uncomfortably hot in the summer. On the advice of Premier Window Systems we insulated our attic and the problem was fixed. I know that sounds magical and improbable, and we didn't quite understand it either, but there is something about the insulation that they use that allows cool air to move around while trapping the energy from the heater that we own so it does not make our energy bills terribly expensive.
We've saved a whole load of money and our house is a much nicer place to live. The winter cold no longer bothers us quite so much and our air conditioner doesn't have to work quite so hard in the summer. Before we had to have an air conditioning repair company come out and fix our air conditioner because it was constantly running on high and kept breaking down, and now, this past summer it has been operating smoothly and without problem. This is evidence by the fact that we haven't had to call anyone out to fix it all summer.