Has anyone built a greenhouse using discarded sliding glass doors?

Answer 1

glass gets to hot and will burn the plants unless you have a temp control

Answer 2

Haven't yet, but plan to. A friend did it and it looks and works great. He even used two sets on the roof - replaced the glass with plexiglass - so can open when it gets too hot. He used aluminum framing - like for a carport and spaced the frame so the doors would fit (used a double carport frame that he extended 6 feet) and used clear plastic siding to fill in the spaces above doors and on the ends. It looks really nice.