I agree it is all balance. A well ventilated tub (as is recommended by the most knowledgeable breeders and vets I know of) is still a problem with humidity it dries out too. So all that is happening is trading one set of problems with lots of possibilities for another with fewer. There is a reason why racks are almost always kept in rooms that are 80ºF and 60% RH. It is about the only option to keep correct temps. With a single animal it is a bit over kill.