if you can add 2 bars on the top of the sidewalls and attach your roof plastic to that, then you can have walls that could be raised in hot weather to vent the greenhouse. you can use a net fabric for the walls at that time and you can add some shading if it is still too hot. That would be similar to a chapel design greenhouse, mine is like that, because i have 4 seasons, and without the flexible walls and the rigid roof i would either cook the plants from the heat or have the wind blow it away
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