the stuff for greenhouses is called filon (i think cant rember to well) its a coragated fiberglass transmits light extremly well plus its very durable and you cant really see through it very well so building even a greenhouse in plain sight you could just keep em from touching the walls and you would be fine as for glass amplifing heat any greenhouse without proper ventalation gets really warm ive been in greenhouse in january when it was -20 out and it was 60+ in the greenhouse during the day but remember when you vent a greenhouse full of herb its gonna smell so you might wanna look ozone generators |