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Re:The Zen of Passive Solar Heating Panel Design (2010) by imaginenore on Sunday September 18, 2016 @06:04PM (#12527433)
Yeah, I'm fully aware of that design. I've seen tests of it against a much simple design with the sheet of fabric in the middle, and there's basically no difference. Cutting so many cans' tops and bottoms is actually not an easy task, I had tried.
Re:The Zen of Passive Solar Heating Panel Design (2010) by redtexture on Tuesday September 20, 2016 @09:24PM (#12544771)
A couple of pieces of plywood, for each window, and some foam strips for air-flow sealing would do. This is not a big effort, just more than your (exceedingly short-lived) cardboard design contemplates.

The gain in creature-comfort in the apartment, might be more than the money saved in avoided heating, as a renter of the apartment.