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I have not done the popcan thing but I have a 4x7 lean-to area (full 8' height) that I plastic-cover for winter and then during sunny days I open the popdoor into it plus the (high) window into the coop, and it functions basically like a walk-in popcan heater
I keep the popdoor and window closed at night and on cloudy days. Note that to do this you have to have good dampness-management on the floor of the area... just doing it on regular ground would be a bit iffy, especially if you let the ground get good and moist before plasticking the thing up and running it for heat.
I get quite a large heat boost from it during the day considering the large size of the building, and it keeps the overall nighttime temps in the building warmer than they'd be otherwise (because bldg is very well insulated and has a slab floor that stores warmth well into late winter)
Not applicable for everyone, but in some situations e.g. mine it can be fairly nifty
The main thing if you want to use any of these passive solar type designs is to design in plenty of thermal mass -- UNinsulated from the indoor air or from the solar heat -- so you get warmth lingering into nighttime. Otherwise you're not doing a whole lot more than making daytime temps higher, which is not really all that useful (it is nighttime lows that are the problem generally in cold winters, not daytime temps)
Pat
I have not done the popcan thing but I have a 4x7 lean-to area (full 8' height) that I plastic-cover for winter and then during sunny days I open the popdoor into it plus the (high) window into the coop, and it functions basically like a walk-in popcan heater

I get quite a large heat boost from it during the day considering the large size of the building, and it keeps the overall nighttime temps in the building warmer than they'd be otherwise (because bldg is very well insulated and has a slab floor that stores warmth well into late winter)
Not applicable for everyone, but in some situations e.g. mine it can be fairly nifty

The main thing if you want to use any of these passive solar type designs is to design in plenty of thermal mass -- UNinsulated from the indoor air or from the solar heat -- so you get warmth lingering into nighttime. Otherwise you're not doing a whole lot more than making daytime temps higher, which is not really all that useful (it is nighttime lows that are the problem generally in cold winters, not daytime temps)
Pat