When these seals fail, the insulating gas escapes and moist air enters, leading to the "blown window" look. Signs Your Windows Need Attention
Many windows come with 10, 20, or even lifetime warranties on the glass seals. Before you spend a dime, find the manufacturer's logo etched in the corner of the glass and call them. You might get a replacement IGU for free! If you'd like to dive deeper, let me know: Is the fogging in a frame? Do you know the brand or age of the windows? resealing double pane windows