The essential thing about drying clothes (or houses...) is ventilation. If these 'drying rooms' are normally ventilated (open window..?) there won't be any build-up of condensation, as the moist air gets changed for fresh air from outside. If, on the other hand, there is no ventilation, the clothes won't dry, and the room (and its contents...) will start to become mildewed, and eventually rot. A free flow of air is the key element, even more important than heat.