A Guide to Drafty Windows. The last thing you want in your home is drafty windows. They allow heated or cooled air escape your home while letting in outside temperatures. ... Window drafts are a common but serious problem.

What causes a drafty window?

One of the most prevalent factors of window drafts is the window seal. When the seal in a double or triple pane window fails to seal properly, the argon gas that is between the panels will escape. Energy efficiency will plummet, and you will start to feel a draft.

How do I know if my window is drafty?

A window draft will likely push or pull the fire in one direction or another. Study the results: If the flame remains straight then, the window is likely well sealed. If the fire is bent or curved, then you probably have a window draft. The more the flame is curved and moving, the bigger the draft.