Improvements in or relating to hand drying systems

A system comprising at least one hand dryer appliance 4 and an electronic control system 40. The electronic control system 40 is configured to determine a parameter set associated with the hand dryer appliance which is indicative of a cost metric for the hand dryer appliance, and to request user-data associated with an alternative hand drying apparatus, wherein that user data is indicative of a comparable cost metric of the alternative hand dryer apparatus. The controller 40 will generate a usage model of the hand dryer appliance based on the determined parameter set and the requested user data, the usage model determining an operating cost metric for the hand dryer appliance and an operating cost metric for the alternative hand dryer apparatus. The controller generates prediction data based on the generated usage model, said prediction data indicating the point in time when the operating cost metric for the hand dryer appliance falls below the comparable cost metric of the alternative hand dryer appliance.