Abstract: A heating, ventilation, and air conditioning (HVAC) control device configured to receive a user input for controlling an HVAC system, to determine whether the user input indicates an energy saving occupancy setting, and to identify a first plurality of time entries that are associated with a confidence level for a predicted occupancy status that is less than a predetermined threshold value in the predicted occupancy schedule. The device is further configured to modify the predicted occupancy schedule by setting the first plurality of time entries to an away status when the user input indicates an aggressive energy saving occupancy setting. The device is further configured to modify the predicted occupancy schedule by setting the second plurality of time entries to a present status when the user input indicates a conservative energy saving occupancy setting. The device is further configured to output the modified predicted occupancy schedule.

Abstract: A method of monitoring a refrigerant leak. The method includes monitoring, by a first controller, operation of a first HVAC system for conditioning air within a first level of a residence, monitoring, by a second controller, operation of a second HVAC system for conditioning air within a second level of the residence and determining, using a plurality of leak detectors, whether refrigerant within the first HVAC system is leaking. Responsive to a positive determination in the determining step, receiving, by the first controller, a refrigerant leak warning signal, forwarding, by the first controller to the second controller, the refrigerant leak warning signal. Responsive to receiving the refrigerant leak warning signal from the first controller, activating, by the second controller, a variable-speed circulation fan of the second HVAC system.

Abstract: An HVAC system includes a heating element, a discharge air temperature sensor, and a return air temperature sensor. A controller of the HVAC system determines that the HVAC system has been operating in the heating mode for at least a predefined amount of time. The controller receives measurements of the discharge air temperature and the return air temperature. A temperature rise value is determined using the discharge air temperature and return air temperature. If the temperature rise value is less than a predefined minimum threshold value, the controller determines that a first fault of the HVAC system is detected and provides a corresponding alert. If the temperature rise value is greater than a predefined maximum threshold value, the controller determines that a second fault of the HVAC system is detected and provides a corresponding alert.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device configured to receive a user input for controlling an HVAC system, to determine whether the user input indicates an energy saving occupancy setting, and to identify a first plurality of time entries that are associated with a confidence level for a predicted occupancy status that is less than a predetermined threshold value in the predicted occupancy schedule. The device is further configured to modify the predicted occupancy schedule by setting the first plurality of time entries to an away status when the user input indicates an aggressive energy saving occupancy setting. The device is further configured to modify the predicted occupancy schedule by setting the second plurality of time entries to a present status when the user input indicates a conservative energy saving occupancy setting. The device is further configured to output the modified predicted occupancy schedule.

Abstract: A method of monitoring a refrigerant leak. The method includes monitoring, by a first controller, operation of a first HVAC system for conditioning air within a first level of a residence, monitoring, by a second controller, operation of a second HVAC system for conditioning air within a second level of the residence and determining, using a plurality of leak detectors, whether refrigerant within the first HVAC system is leaking. Responsive to a positive determination in the determining step, receiving, by the first controller, a refrigerant leak warning signal, forwarding, by the first controller to the second controller, the refrigerant leak warning signal. Responsive to receiving the refrigerant leak warning signal from the first controller, activating, by the second controller, a variable-speed circulation fan of the second HVAC system.

Abstract: An HVAC system includes a heating element, a discharge air temperature sensor, and a return air temperature sensor. A controller of the HVAC system determines that the HVAC system has been operating in the heating mode for at least a predefined amount of time. The controller receives measurements of the discharge air temperature and the return air temperature. A temperature rise value is determined using the discharge air temperature and return air temperature. If the temperature rise value is less than a predefined minimum threshold value, the controller determines that a first fault of the HVAC system is detected and provides a corresponding alert. If the temperature rise value is greater than a predefined maximum threshold value, the controller determines that a second fault of the HVAC system is detected and provides a corresponding alert.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device configured to generate the machine learning model using the first set of weights and the second set of weights. The machine learning model is configured to output a probability that a user is present at the space based on an input that identifies a day of the week and a time of a day. The device is further configured to determine a probability that a user is present at the space for a predicted occupancy schedule using the machine learning model, to determine an occupancy status based on a determined probability that a user is present at the space, and to set a predicted occupancy status in the predicted occupancy schedule based on a determined occupancy status for each time entry. The device is further configured to output the predicted occupancy schedule.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device configured to generate the machine learning model using the first set of weights and the second set of weights. The machine learning model is configured to output a probability that a user is present at the space based on an input that identifies a day of the week and a time of a day. The device is further configured to determine a probability that a user is present at the space for a predicted occupancy schedule using the machine learning model, to determine an occupancy status based on a determined probability that a user is present at the space, and to set a predicted occupancy status in the predicted occupancy schedule based on a determined occupancy status for each time entry. The device is further configured to output the predicted occupancy schedule.

Abstract: An HVAC system includes a controller configured to receive weather forecast information including anticipated future outdoor temperatures. Based at least in part on the weather forecast information, the controller determines that test-initiation criteria are satisfied for testing operation of the HVAC system in a test mode. In response to determining that the test-initiation criteria are satisfied, the controller determines that current weather conditions are suitable for operating the HVAC system in the test mode for a test time period. The HVAC system is operated in the test mode for the test time period.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device is configured to record a plurality of actual occupancy statuses, to determine a plurality of corresponding predicted occupancy statuses, and to compare the plurality of predicted occupancy statuses to the plurality of actual occupancy statuses. The device is further configured to identify conflicting occupancy statuses based on the comparison. A conflicting occupancy status indicates a difference between an actual occupancy status and a corresponding predicted occupancy status. The device is further configured to identify timestamps corresponding with the conflicting occupancy statuses, to identify historical occupancy statuses corresponding with the identified timestamps, and to update the conflicting occupancy statuses in the predicted occupancy schedule with the historical occupancy statuses.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device is configured to record a plurality of actual occupancy statuses, to determine a plurality of corresponding predicted occupancy statuses, and to compare the plurality of predicted occupancy statuses to the plurality of actual occupancy statuses. The device is further configured to identify conflicting occupancy statuses based on the comparison. A conflicting occupancy status indicates a difference between an actual occupancy status and a corresponding predicted occupancy status. The device is further configured to identify timestamps corresponding with the conflicting occupancy statuses, to identify historical occupancy statuses corresponding with the identified timestamps, and to update the conflicting occupancy statuses in the predicted occupancy schedule with the historical occupancy statuses.

Abstract: An HVAC system includes a heating element, a discharge air temperature sensor, and a return air temperature sensor. A controller of the HVAC system determines that the HVAC system has been operating in the heating mode for at least a predefined amount of time. The controller receives measurements of the discharge air temperature and the return air temperature. A temperature rise value is determined using the discharge air temperature and return air temperature. If the temperature rise value is less than a predefined minimum threshold value, the controller determines that a first fault of the HVAC system is detected and provides a corresponding alert. If the temperature rise value is greater than a predefined maximum threshold value, the controller determines that a second fault of the HVAC system is detected and provides a corresponding alert.

Abstract: An HVAC system includes a controller configured to receive weather forecast information including anticipated future outdoor temperatures. Based at least in part on the weather forecast information, the controller determines that test-initiation criteria are satisfied for testing operation of the HVAC system in a test mode. In response to determining that the test-initiation criteria are satisfied, the controller determines that current weather conditions are suitable for operating the HVAC system in the test mode for a test time period. The HVAC system is operated in the test mode for the test time period. Following operation of the HVAC system in the test mode for the test time period, the controller determines whether a predefined change in an indoor air temperature is achieved. If the predefined change in the indoor air temperature is achieved, the test is passed. Otherwise, the test is failed.

Abstract: A heating, ventilation, and air conditioning (HVAC) control device is configured to record a plurality of actual occupancy statuses, to determine a plurality of corresponding predicted occupancy statuses, and to compare the plurality of predicted occupancy statuses to the plurality of actual occupancy statuses. The device is further configured to identify conflicting occupancy statuses based on the comparison. A conflicting occupancy status indicates a difference between an actual occupancy status and a corresponding predicted occupancy status. The device is further configured to identify timestamps corresponding with the conflicting occupancy statuses, to identify historical occupancy statuses corresponding with the identified timestamps, and to update the conflicting occupancy statuses in the predicted occupancy schedule with the historical occupancy statuses.

Abstract: An HVAC system includes a blower configured to provide a flow of air into a conditioned space. A temperature sensor measures a discharge air temperature of the flow of air provided to the conditioned space. The blower provides the flow of air at a predefined flow rate. The controller determines that the measured discharge air temperature satisfies predefined stability criteria associated with a change in the discharge air temperature during a first period of time being less than a threshold value. If the stability criteria are satisfied, a temperature offset is determined between the discharge air temperature and an indoor temperature. The temperature offset is stored in a memory and is associated with the flow rate of air provided by the blower and the outdoor temperature.

Abstract: An HVAC system includes a blower configured to provide a flow of air into a conditioned space. A temperature sensor measures a discharge air temperature of the flow of air provided to the conditioned space. A controller of the HVAC system determines that heating or cooling mode operation is not requested. Following this determination, the blower provides the flow of air at a predefined flow rate. The controller determines that the measured discharge air temperature satisfies predefined stability criteria associated with a change in the discharge air temperature during the first period of time being less than a threshold value. If the stability criteria are satisfied, a temperature offset is determined between the discharge air temperature and an indoor temperature. The temperature offset is stored in a lookup table such that the temperature offset is associated with the flow rate of air provided by the blower and the outdoor temperature.

Abstract: An HVAC system includes a blower configured to provide a flow of air into a conditioned space. A temperature sensor measures a discharge air temperature of the flow of air provided to the conditioned space. A controller of the HVAC system determines that heating or cooling mode operation is not requested. Following this determination, the blower provides the flow of air at a predefined flow rate. The controller determines that the measured discharge air temperature satisfies predefined stability criteria associated with a change in the discharge air temperature during the first period of time being less than a threshold value. If the stability criteria are satisfied, a temperature offset is determined between the discharge air temperature and an indoor temperature. The temperature offset is stored in a lookup table such that the temperature offset is associated with the flow rate of air provided by the blower and the outdoor temperature.

Abstract: An HVAC system includes a controller configured to receive weather forecast information including anticipated future outdoor temperatures. Based at least in part on the weather forecast information, the controller determines that test-initiation criteria are satisfied for testing operation of the HVAC system in a test mode. In response to determining that the test-initiation criteria are satisfied, the controller determines that current weather conditions are suitable for operating the HVAC system in the test mode for a test time period. The HVAC system is operated in the test mode for the test time period. Following operation of the HVAC system in the test mode for the test time period, the controller determines whether a predefined change in an indoor air temperature is achieved. If the predefined change in the indoor air temperature is achieved, the test is passed. Otherwise, the test is failed.

Abstract: A method of monitoring a heating, ventilation, and air conditioning (HVAC) system for refrigerant leak. The method includes monitoring, by a controller, operation of the HVAC system and determining, using a plurality of leak detectors, whether refrigerant within the HVAC system is leaking. Responsive to a positive determination in the determining step, receiving, by the controller, a refrigerant leak warning signal and modifying, by the controller, operation of the HVAC system to prevent the refrigerant from entering an enclosed space.

Abstract: A method of monitoring a heating, ventilation, and air conditioning (HVAC) system for refrigerant leak. The method includes monitoring, by a controller, operation of the HVAC system and determining, using a plurality of leak detectors, whether refrigerant within the HVAC system is leaking. Responsive to a positive determination in the determining step, receiving, by the controller, a refrigerant leak warning signal and modifying, by the controller, operation of the HVAC system to prevent the refrigerant from entering an enclosed space.