Promotion package heating and windows - DuoFern starter set for smart control of room temperature and status monitoring of doors and windows This set from Rademacher allows the smart control of conventional radiators, the control of the opening of doors and windows as well as the linking of both functions. The two DuoFern radiator actuators replace conventional radiator thermostats. They have their own temperature sensors as well as, among other things, a boost function for rapid heating, frost protection (the room temperature is prevented from falling below 4 °C), valve protection against calcification and always allow manual control of the radiators. The door/window sensor is used for opening control. On the one hand, it fulfils a security function in that the status of doors and windows can be checked while on the move and unauthorised openings during predefined times trigger a warning. On the other hand, the sensor can be coupled with the radiator actuators to reduce the heating ou