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Klaaar, I see you're in Zone 6 - what part of the country are you in? (I wouldn't think Zone 6 was all that hot)
I don't know that I'd go for vests and such, but would invest in a 5 gallon cooler stocked with ice. Otherwise, your staff will be spending too much time on the stocking and maintenance of their cooling systems, not on the work.
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