Anyways I have 16Mh/s in a small room. It feels like a sauna at 108F and can overwhelm a 12k air conditioner in just a few minutes.
Damn! We've got 8MH/s in a decent sized room, but there's not outside ventilation so it gets up to around 85F. We're moving them asap and installing 3 ACs so we can get some more hashrate. Even that warm, we keep our 290s in the low 80C range, and the undervolted 280xs in the mid 70C range. Not too too bad, but could be better.
What kinda temps do your cards run at if your ambient is 40C+?!