Racks are not always the be all end all. They have limited heating options and in rooms at or below normal room temps (68ºF or below) it is very often that some sort of secondary heat is needed. The common method is just to heat the whole room to the correct cool/ambient air temp of 80ºF. I find them very hard to clean as well. Personally I disinfect surfaces my enclosures in side and out. The rack I do the same but where the enclosure has only 12 surfaces the rack has per tub 24 narrow difficult to access surfaces. It takes me about 1/3 longer per tub in the rack than a fully decorated enclosure. I actually disinfect during a full clean and follow the instructed methods on my disinfectant I have encountered many here who do not. Personal choice, I am 100% confident of my enclosures after a clean, the rack I am not so certain, too many nooks and crannys to get at.
Never trade humidity issues for heat, heat is critical, humidity is not nearly as much. The easy solution to humidity issues is usually just adding a humid hide during at the beginning of a shed cycle. Most of my enclosures are in a room that I have a humidifier so it is usually 60% or so. There is one not in that space that is usually at 45% or so I just add a humid space at the beginning of the shed and that is it. I have one piece sheds and no other issues. The only issue related to reasonable humidity (40-70%) is too much and too little air flow which is linked to Respiratory issues in snakes and mammals for that matter. (sick building syndrome...)
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http://ball-pythons.net/forums/showthread.php?137453-Aquarium-Solution
another option... PVCx enclosures are awesome BTW the best of all worlds. My personal pick for the optimal enclosure, the only downsides are cost and space.