In reply to:

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suggestions would be appreciated

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Yes, sack your fscking janitor!

Seriously, we've got three full height bays full of servers and assorted audio and video equipment. We found a cracking air conditioner at the local a local diy store for about £200. We managed to reduce the temperature noticably, the only thing we needed to do was duct the hot air outside and drain the moisture tank every week.

We had a janitor come into our office and try to plug in his vacuum cleaner. He chose the wrong socket and destroyed a server along with all the work in it. Once we'd told his company how much the equipment cost and how we would re-coup it from them, they decided not to keep the poor guy on. Can't say I was upset.....