I have a little bay house and along the water front side the old porch was enclosed and "windows" installed. I put "windows" in quotes because what I have really is a single pane of glass framed in with something like 1"x1" wood. I have no need to open these windows so that's not a particular problem. THey do let in a lot of heat though. So would I be totally retarded to simply buy panes of low E glass and add a pane on the outside and perhaps the inside and make myself a 3 pane energy efficient window? I haven't priced out replacing this glass with real windows yet. I have about 8 of these and they are ~24"x36"