Can you feel a cold draft coming in through your windows? One of the most common causes of window drafts is the window seal becoming ineffective. When the seal in a double or triple-glazed window fails to seal properly, the argon gas that is between the panels will escape. When this happens your home’s energy efficiency will plummet, and you will start to feel a draft. Not only will your heating bills go up as you attempt to keep your family warm, but a broken seal can also cause air to can seep between the panes and create condensation.