Reader needs Aircon help

Reg reader "PG" has mailed looking for advice on "a suitable air conditioning unit for a small office/data centre."

PG says the facility has "no windows, only a door to the outside world" and is approximately "6m (l) x 3m (w) & 2.8m (h)."

"It's over 33c in here today and a few of the non-critical servers have shut down (rack Temp has hit 45c). The UPS is wobbling and occasionally tripping the mains."

Desktop PCs are producing errors that he thinks are heat-related.

Help PG out in the comments please, people. ®