Q. We have numerous double-paned windows. Several of these are fogging up between the panes of glass. It appears to be moisture condensation. How can this be removed? The glass panes are in good ...

Q: Can low-E/argon gas be put in a window when the seal is broken, instead of replacing the entire window? A: Let’s start by clarifying the purpose of low-E and argon gas. Low-E (low-emissivity) ...

You might not see it, but there’s a good chance your windows are quietly wasting energy—and driving up your utility bill.

Q: I've read your recent column about windows and have some related questions. I have dual-pane windows whose cells have "leaked" and the inside surfaces are discolored. They are installed in ...