Your home's insulation works year-round to keep warm air either in or out. If your home is poorly insulated, energy (and money) are literally flying right out the window. If an expensive whole-home insulation job or window replacements are out of your budget, there are some small steps you can take to help improve your home's insulation. If air leaks from any windows or doors in your home plug the leaks with caulk or weatherstripping. Install storm windows over single-pane windows during the cold months of the year. If your home has a fireplace be sure the flue damper is tightly closed when not in use.