A bit off topic, but worthy of mentioning because of the cooling concerns with multiple computers.

This is a unit I recently purchased and it's working great so far. Although the room I have it in is only 250 sq ft, it is very quiet and cool
It's a sharp CVP 12LX 11,500 BTU portable a/c.
Best price I've found is @ newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16896111041