Heating accounts for more than 29 percent of all annual utility usage, so make sure your heating system is in tip-top shape. One easy thing you can do is to check your ductwork: Is it as tight as possible? Are there any leaks? You can fix leaks with simple duct mastic or tape, which can help reduce heating loss and improve your heating system's efficiency as much as 20 percent. It will also help deliver warmer air throughout the home and that, combined with a programmable thermostat, will save you money and keep you warm all winter long.