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I live in a 35' R-license park model trailer. Electricity swings between ~30-60 dollars a month through the year, at 5¢/kWhr. My South-facing window has what must be Reflectix, most of the others have [removable] 1/4" paper-backed foam, so I don't have to look at/be looked at by my neighbors.
I need to redo the roof as it black tar. What I'd like to do is put foam insulation down inside a curb with a shiny skin up, fill the curb level with black metal (for thermal mass), PV cells or old refrigerator radiators plumbed together. Then skin it with greenhouse glazing. Two or four feet wide. with Sno-Seal on the outside of the curb and the curved part of the roof. It would span 2ea 14" roof vents or 3 with a fan in the middle one.
Run it in the day for heat and at night for cooling. It could be as little as a 2" curb, with 2-3" of arch in the glazing. I think that between the additional insulation, the hot air, and the secondary heat capture, it would have a good ROI.
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