Setting your lights up to be on at night when it's cooler can help ... Even more so when your drawing air in from outside ... If funds permit is suggest an inline fan for exhausting air out .... The faster you can replace the air in your space the better... Or even look into an air cooled hood ... Another idea is a cheep do it yourself air conditioner .. Have a look on YouTube
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Just remember to exhaust air as far away from your room as possible ..