There was some discussion on this several years ago. Personally, I don't know, but I do feel better with the T6 next to our windows than the strongly radiant Castine. Are windows designed differently for areas like Phoenix, AZ?How do modern double/triple pain windows handle being this close to high heat? I imagine the window will fail much sooner than normal? What type of window is it? Wood, Vinyl, fiberglass, etc?