I am running 20 cards in a apartment room of size 300 sq feet. Can someone doing similar setup respond?
Ran 40+ cards in an apt last year. At one point it was 117F inside.
The only decent solution I found for my personal situation was to put them all in my bedroom and close the door and exhaust out the window with a 1250CFM fan. (Also cut a large square out of the bottom of the door for an intake, it was ugly. )
It worked, but it wasn't ideal to give up my bedroom for the whole summer. Lived in the living room and barely ever went in the bedroom.
Another idea would be a grow tent or build a small room out of 2x4's and wrap it in poly film and exhaust out the window.