Insulated double-pane glass windows are very energy efficient. However, over time, the seal separating the two panes can break, allowing outside air and moisture in that can fog up the glass. Indicators for replacing insulated windows include this fogging issue.
You can check out our guide on the replacement of fogged insulated window glass for insight on how to do that.
You might also want to check out our informative video above on the steps for plastic window insulation, where we provide detailed guidance and tips for a successful installation process.