While these are usually not the biggest source of a chill flowing through a home, they can certainly add to the problem. Cold air has the ability to creep through just about any minuscule cracks around your home, including light switch and outlet plug covers and cracks in the drywall. You can actually purchase and easily install Foam Insulating Gaskets for a couple bucks. This will be your best defense, as stuffing insulation around electric wiring is not a good idea.

The cracks in the wall can be fixed as easily as spreading a bead of acrylic/silicone caulk across the length of the crack and then smoothing it out with a damp sponge. Make sure that the caulk is "paintable" if you plan on painting over it later.

There you have it. While these are a few of the most common causes of a draft running through your home, there are still many other culprits it could be. Here are a few more ideas to help keep your home warm, efficient, and insulated against the chill this winter: