My Monty is in Arizona and it gets "kinda" hot there. At a friend's suggestion I went to local hardware store and bought bubble-pack material covered with aluminum to put on the inside of the windows. It came in two widths - 12" and 24" - and was sold by the foot (cut from rolls). It has made a significant improvement blocking out the heat transfer through the windows. Enough material for all windows was less than $30.00 and well worth the investment. ONLY down-side is that I can't see out windows and limited sunlight (DUH!)
