The place where i work has a shop floor - ( where i work ) and Offices. All the dickheads in the office were complaining recently about how hot it was in the office ( even though it`s far hotter where we work and no-one gives a shit)!!
Anyway - they went out and bought a small portable air-conditioning unit and i was quite stunned at how amazing these things are !! You walk from the shop floor into the office now and it`s like walking from the sahara to the North pole in a split second!! -- i thought `` GROW ROOM ``` straight away.
All they do is suck air in from outside and chill it but fuck me they drop the temp of a room hugely!!!
u`d have to have a 4" (120 mm) hole in ur wall for intake and i don`t think they come cheap but by the sounds of it ------ if u`ve got a grow room that size then ur obviously not just growing on a small scale and it would be an investment.
i`m planning to have a room of similar size soon just for growing and if my budget can stretch then i`d certainly consider 1. depends on the scale of ur grow though really.
I know all about the problems of heat -- killed a few babies from heat recently so been looking into all aspects of controlling temps.
Hope this isn`t just a waste of ur time ---- just my thoughts in type!!