How do I winterize my home to lower heating bills?

Start by sealing air leaks around windows, doors, and electrical outlets using weatherstripping, caulk, or foam sealant. These gaps are responsible for a significant portion of heat loss. Add door sweeps to exterior doors and consider insulating your attic, as heat rises and escapes through the roof most easily. Set your thermostat lower when sleeping or away from home, ideally using a programmable or smart thermostat to automate this. Reverse ceiling fan direction to clockwise to push warm air down. Insulate exposed pipes and water heater if it's in an unheated space. Keep heating vents clear of furniture, and replace furnace filters regularly so your system runs efficiently. Heavy curtains on windows also help retain heat at night.