Electronic room controller for wall mounting. Suitable for controlling central heating, hot water underfloor heating, electric heating, night storage heating, etc. On/off switch. Improved control properties through pulse width modulation. Connection of a remote sensor is possible. Heating/cooling switchover in conjunction with distribution strips with the corresponding input. Range restriction in the setting knob as a heating cost brake. Surface mounting or directly on flush-mounted box with vertical mounting holes or with snap-on mounting on DIN rail.