You install the HVAC thermostat in any room that has an indoor unit of the VRV, VRF or multi-split air conditioning system (HVAC system). The HVAC thermostat controls the heating or cooling of the room in which it is installed. You can modify the temperature and adjust the ventilation speed. As Niko Home Control controls the heating or cooling in different rooms, the resident can considerably save energy by linking the HVAC thermostat, for example, to the eco-function (all off) or calendar-based functions. The resident will use the PROTECT mode for long-term absences: the room temperature will be maintained between a minimum and maximum value. The HVAC thermostat works together with the Niko Home Control IP interface and gateway. The communication with the HVAC system is established via the HVAC interface (CoolMaster).