Esther08 - First place I bought only had warm air heating, wardrobes were built in, but on external walls. Dehumidifier [as Hamish suggests] was a godsend. You could also try, an insulating layer on the wall - something like polystyrene tiles, or what worked in parents place was a greenhouse type heater [electrical, like a long tube about 6" high. Put at the back of wardrobe, they should have a built in thermostat. Put some air vents at the top of the wardrobe [either in doors or walls] then you'll get a decent flow of air through & no pongs. Don't pack clothing in too tight, and move them round once in a while.