It's easy to feel the effects of a drafty door or window, but cold air can also seep into a heated home (or out of an air-conditioned home) through several other surprising sources. And even the smallest leak can rack up a big energy bill. In fact, the Department of Energy estimates that homeowners can save up to 30 percent on their monthly energy bills just by properly weatherizing their home.

While many homeowners are aware of the benefits of weather stripping doors and windows, they may overlook other common sources of air leaks. Seal these often-undetected spaces, and homeowners could see a huge difference in energy expenditures.