Ok, so I've got my rack all set up and warm side temps are stabilized. The cool side temps, however, are ranging from 82 (which is ok) down to 77 depending on the room temperature. My house doesn't have central heat an air (almost nobody does in WA), so inside temp is dependent on the outside temp.

Any suggestions?

I just draped a blanket over the sides and top to help hold in some of the heat, so hopefully that'll help. I also have NO holes in the tubs at this time but probably need some to lower the humidity a bit, which further compounds the problem. Anything else I can do?