Niekie,
Condensation should not be a problem. This room is dedicated for TIG use only. The thought is that evaporative coolers will be much more cost effective than air conditioning and combined with an exhaust system, the air turnover can be better controlled. When the outside temperature drops, the coolers could run on fan only (without the water circulation) This shop is above 5000' elevation in the Rockies, where there is low humidity to start with.
Thanks for the input