Abstract: The invention relates to a thermostat for communicating with a remote maintenance server. The thermostat being configured for receiving and sending network data from and to the remote maintenance server. The thermostat is configured to receive network data provided by a maintenance interface service for receiving and displaying network data from and to a maintenance person. The thermostat is configured for receiving and sending remote controller data from and to a remote controller. The thermostat is configured to receive remote controller data from a user through a controller user interface. The thermostat is configured for receiving and sending appliance data from and to at least one appliance. The thermostat is configured for generating a request for appliance data from the at least one appliance and the thermostat is configured for receiving appliance data in response to the request for appliance data.

Abstract: The invention relates to a thermostat for communicating with a remote maintenance server. The thermostat being configured for receiving and sending network data from and to the remote maintenance server. The thermostat is configured to receive network data provided by a maintenance interface service for receiving and displaying network data from and to a maintenance person. The thermostat is configured for receiving and sending remote controller data from and to a remote controller. The thermostat is configured to receive remote controller data from a user through a controller user interface. The thermostat is configured for receiving and sending appliance data from and to at least one appliance. The thermostat is configured for generating a request for appliance data from the at least one appliance and the thermostat is configured for receiving appliance data in response to the request for appliance data.

Abstract: A thermostat for a HVAC comprising: a data communication port for connection to the HVAC, wherein the thermostat is arranged to communicate via the data communication port an operating parameter of the HVAC, and estimate an energy consumption of the HVAC from the communicated operating parameter of the HVAC. The operating parameter may express a fraction of a nominal load of the HVAC, the thermostat being arranged to estimate the energy consumption from a multiplication of the operating parameter and a nominal energy consumption parameter of the HVAC at the nominal load.