There's a chap on here that made a large outbuilding for his wife to use as to train dogs; his 'sweetener' for getting a new plasma cutter or CNC machine if I recall. I recall that he installed a very high quality heater or dehumidifier in it and I looked at the make; they also did (I think) gas powered ones that don't create the moisture and condensation - that piqued my interest. Wish I'd saved it... they may do electric ones too?