not sure bout this

I can't speak from experience, but what I'd do if it were me is get some fresh air in there. What's your current airflow situation?

I'd also allow them to dry out a bit more between waterings.
 
If they don't seem crisp or dry on the leaves then most likely it's not heat. When your plants point down they are usually pointing you in the direction of the problem. I would check your pH levels and and find out if you are under or over feeding.
 
I can't speak from experience, but what I'd do if it were me is get some fresh air in there. What's your current airflow situation?

I'd also allow them to dry out a bit more between waterings.
I agree here. It could be over watering, again your pH level and ppm/ec will help you dial this in. If it's too high then you can skip a feeding.
 
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