I'm curious as to why you went with that particular rack? With the open back and sides it would seem to lose more heat that the heaters will just have to replace. Unless your whole room is at the base temp. and heat loss is not an issue? just curious
i have the steralite version of this rack and my tubs hold heat VERY well. the humidity is a little low because i got the rack and tubs second hand and they have a few too many holes but my regular humidity is around 45-50% so its not that bad.