If you're looking for ways to save money on heating and cooling costs, it's a good idea to focus on your windows and doors. Why? Well, those openings already exist in your house and chances are the seals are not as tight as the day the windows and doors were installed. One way to find out if you have drafty doors and windows is to hold a candle nearby and see how the flame reacts. You may see the flame moving just a bit or you may even see it laying nearly horizontal, indicating that air is moving through the cracks around the door or window.
replacement windows. If your budget is too tight for a major overhaul, consider changing just a few windows that seem to be leaking air the most.