Air leaks around the home can add 10 percent to your heating bill. Find the leaks in your house and plug them. Some places to look:

• Windows. On a windy day, light a stick of incense and hold it near the window. If the smoke travels horizontally, your window is leaking. Seal, caulk or weather strip it.
• Entry points for wiring. Check ceilings, floors and soffits over cabinets for tiny holes in the home’s exterior that were drilled to let wiring pass into the house.
• Doors, dropped ceilings, recessed lights, attic entrances, still plates, water and furnace flues, and chimney flashing. Don’t overlook any place where cold air has an easy way to enter the house.
• Ducts. They’re hidden in walls, floors and ceilings so you can’t see them. But holes in ducts can cost you a lot of money. Use electrical tape to repair and seal minor holes in your ducts. Call a professional for major repairs.