The information shared about the type of home that Insight builds has turned out to be quite accurate. It is incredible how clean (dust-free) the home is staying with the filtration system. Our electric bills are running about $110.00 per month for 3,200 square feet of living space! That is impressive. With the winter months and the cool damp spring, the windows are all that you described them to be. So thanks again for all your help and honesty from day one.