Between my front door and the corner of the house are five windows with only the aluminum frame triple track windows. Three open into the house while the end two open into an enclosed but unheated porch; a door separates the porch from the house. We lose a lot of heat in the winter through those three windows. I don't want to use the plastic wrap to seal the windows; I'd like to replace the three house windows but if I did so, I'd also have to replace the two porch windows to have a matching set. I hate to spend the extra money for two windows I don't really need.
Since the triple track are actually outside, tacked on to the outer window frame, I have about five inches between the triple track and the inner wall of the house. It seems that I should be able to get some sort of window to mount in that area, leaving the triple track in place. I suppose I could just get three regular double-hung windows at HD or Lowe's but I wondered if anyone knew of any special type of window for this sort of application.