I need some advice for my energy inefficient home. I have lived in a 1960 single-family, split-level home for about five years and during the fall and winter, my house is extremely cold and requires a lot of energy to heat. The walls are cold and I have already replaced every window in the home except one! We recently made a hole in the wall to find out if it had insulation. Although it was hard to make a determination, I believe that they are insulated but, considering the house is nearly 50 years old, I'm not quite sure how effective the insulation is.
I am concerned because my gas bill is about $600 a month and I would like to know what to do to resolve this energy inefficiency problem. I want to have a warm, cozy home without using so much heat that I hurt my pockets!