Take a quick survey around your home of office. Have you ever considered all of the areas that you may be losing your conditioned air? All of your window frames and doors can be caulked to help this issue. An easy solution is use low VOC caulk and foam strips around windows and door frames that leak air. Add door sweeps and door shoe gaskets. A 1/8" space around your door is like having a brick size hole in your wall. Imagine one of these for every door in the house!