i was under the impression that UTH only was the preffered method? if there is enough insulation around 3 sides and the top (with holes to prevent stagnant air) i would imagine that the ambient are would slowly but surely increase and level out. i'm currently running uth/che and constantly misting to keep the humidity up. on friday, however, i should be getting my thermostat and 2nd UTH in the mail :-D