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Old 11-09-18, 08:02 AM   #2
Lurking Renovator
Join Date: Jan 2015
Location: Netherlands
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I recommend checking out (For example this project: They do wonderful things there with solar heating, so worth a read.

For what you're trying to do I would think that twin wall polycarbonate would be sufficient and would more worry about the thermal mass of the concrete floor preventing the air from heating up.

Easiest thing to do is just to attach the polycarb panels (under an angle for efficiency) to the porch and have a fan with a temp sensor blow the warm air into the house.

Trying to make the doors slide would probably add a lot of complexity to the project. If you're worried about cooling in summer an easier way would be to make a roof window or a latch of some sorts that can open to dump heat.

You could also consider only glazing half the porch.
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