While they can help you save on energy costs and work well for interior doors if you're trying to conserve energy by only heating or cooling specific rooms in your home, draft stoppers are no substitute for properly weatherstripping your exterior doors and windows.

Are draft stoppers effective?

One of the simplest but most effective tools for keeping your house warm in the winter is a draft stopper. ... A draft stopper can keep the warm air inside and cold air outside during those freezing winter months. What's more, they can also keep cool air in during the hot summer months.

Do draft stoppers help with noise?

Draft stoppers are exactly what they sound like. They're essentially long pillows with heavy filling that will prevent the draft from coming into your room. ... The way a draft stopper works to soundproof your room is pretty simple. Whenever you're soundproofing anything, you need mass, density, or both.