Abstract: A method of operating a heating, ventilation, or air conditioning (HVAC) monitoring system includes, at a remote monitoring apparatus, receiving and storing frames of data from a local monitoring device installed at a building. Each of the frames includes time domain current data based on a measured aggregate current supplied to a plurality of components of an HVAC system of the building and frequency domain data based on the measured aggregate current. The method includes, based on the frequency domain current data and exclusive of individual current data from a plurality of individual current sensors, determining an individual contribution of a first component of the HVAC system to the measured aggregate current. The method includes transmitting information based on the stored current data to an HVAC manufacturer. The method includes, if a problem is identified with the first component using the determined individual contribution, transmitting an alert message.

Abstract: A method of operating a heating, ventilation, or air conditioning (HVAC) monitoring system includes, at a remote monitoring apparatus, receiving and storing frames of data from a local monitoring device installed at a building. Each of the frames includes time domain current data based on a measured aggregate current supplied to a plurality of components of an HVAC system of the building and frequency domain data based on the measured aggregate current. The method includes, based on the frequency domain current data and exclusive of individual current data from a plurality of individual current sensors, determining an individual contribution of a first component of the HVAC system to the measured aggregate current. The method includes transmitting information based on the stored current data to an HVAC manufacturer. The method includes, if a problem is identified with the first component using the determined individual contribution, transmitting an alert message.

Abstract: A method of operating a heating, ventilation, or air conditioning (HVAC) monitoring service is described. The method includes: providing a local device for installation in an HVAC system of a residential or commercial building; periodically receiving data from the local device across a wide area network, wherein the received data includes electrical sensor data including at least one of current or power; and storing the received data. The method further includes: analyzing the stored data to selectively identify problems and selectively predict faults of the HVAC system; receiving a subscription fee corresponding to the building, the subscription fee applying to a calendar period; and during the calendar period, providing information on the identified problems and the predicted faults to a customer corresponding to the building.