Donk, what I did before I got a cooled cabinet was to put the desktops right into a 48 quart igloo. I got several 1/2 gallon milk jugs and froze water in them. Placing one right on top of the closed cooler (outside, not inside) and cover it up with a folded bath towel for added insulation. Put a small towel (kitchen size) underneath for condensation.
They would last about 12 hours before thawing out, so I'd switch them first thing in the morning and then again 12 hours later. My apartment was about 74, 75 degrees but this kept them right at 68 degrees in the cooler. Having the cooling source outside the igloo kept the temp inside from dropping too low. Beads held the RH w/no problem.
It did cause some condensation on the inside of the cooler lid, so I'd put another kitchen towel over the top of the humis.
Once I got into the routine of doing this every day, it was easy. (Of course, not as easy as a Staebell Aristocrat! :wink: )
Good luck!