Room is somewhat sealed off. Has a door I can shut that really blocks it off from the house. There are two central AC drops in the room, but I can close those off as well. Opening the window will probably be fine come fall/winter, but right now it's mid to high 90's during the day and dropping down to 80 or so at night.
I did put the small AC unit I had in the window to test it out and it works great, but started causing power issues
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
That little unit drew 4 AMP's and almost 450 watts while running. The spike during startup was enough to trip the breaker once so I ran an extension from a neighboring room that's on another circuit.
I think I might just need to split some of the machines up due to power/cooling issues of having it all in one room. Which is a shame because I had a nice setup where I mounted mobo risers into a 2 x 4 sheet of plywood and have 3 motherboards running on it on a good sized table.
I guess I could just run some extensions from other circuits, but as it stands, I'm gonna have 4 machines with 15 GPU's running in that room :p