Light transmission is better with glass, clear polycarbonate is next best and is warmer. As ever it's a compromise between what fits and your budget. You will not regret getting one.
Rather than start a new thread for a fairly basic question, I thought I'd just pop a query on the back of this if I may.
What are people's experiences of greenhouses with the door (or even double doors) along the length instead of the gable? That is the configuration offered to me on a 10x8 Elite but I'm curious about how workable it is against a gable-end door.
I do think you get more into a end door rather than a side one, but it does depend on the shape you need. Maybe air circulation is better, but as long as you have skylights too that's no problem. My only question is if you want a slightly warmer end, say for peppers, you wouldn't have one. Hope this helps @Astraeus
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What are people's experiences of greenhouses with the door (or even double doors) along the length instead of the gable? That is the configuration offered to me on a 10x8 Elite but I'm curious about how workable it is against a gable-end door.