i have a small shed outdoors with only 5 miners. run 2 of these:

https://www.amazon.com/gp/product/B01G8I7HJE/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

put 4 of these for intake

https://www.amazon.com/gp/product/B004Y753WU/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

underclock gpus, and place the rigs 8"s from the intake vents.

about 3" between each gpu and my stuff never exceeds 76C.

outside temps are 98f and right before the air leaves my shed it hits 104f. typically 80% humidity here as well.