Heating/cooling climate controller with fan output and heating/cooling switch for controlling fan coil units or partial air conditioning systems in a 4-pipe system for hotels, residential and business premises. The KTBSB-113.500 has 3 switches with which the controller is put into operation, the heating, cooling or ventilation function and the fan level are selected. The operation of the controller and the active cooling or heating are indicated by lamps. The setting range can be limited mechanically under the button with the setting flags. Surface/wall mounting or using an adapter plate on a flush-mounted box.