Methods, controllers, and the like are disclosed that can include determining an occurrence of an event (where the occurrence of the event is determined by a controller of a heating, ventilation, and air conditioning (HVAC) system, and the HVAC system controls a temperature of air in an environment by controlling a setpoint temperature of conditioned air provided by the HVAC system to the environment). Such methods, controllers, and the like can further include, in response to a determination that the event has occurred, altering the temperature of the air in the environment by executing a sleep profile, where the sleep profile is executed by the controller and execution of the sleep profile adjusts the setpoint temperature as a function of time over a time period, such that the temperature of the air in the environment leads an occupant in the environment into a sleep state or a wakeful state.

Methods, controllers, and the like are disclosed that can include determining an occurrence of an event (where the occurrence of the event is determined by a controller of a heating, ventilation, and air conditioning (HVAC) system, and the HVAC system controls a temperature of air in an environment by controlling a setpoint temperature of conditioned air provided by the HVAC system to the environment). Such methods, controllers, and the like can further include, in response to a determination that the event has occurred, altering the temperature of the air in the environment by executing a sleep profile, where the sleep profile is executed by the controller and execution of the sleep profile adjusts the setpoint temperature as a function of time over a time period, such that the temperature of the air in the environment leads an occupant in the environment into a sleep state or a wakeful state.

A controller device for a heating, ventilation, and air conditioning (HVAC) system may output, while in a first state, a first user interface for display at a display device, where the first user interface includes first information at a first output size. The controller device may determine, while in the first state and based at least in part on whether an elapsed time since a most recent indication of user input received at a user input device exceeds a timeout period, that no users are physically proximate to the controller device. The controller device may, in response: transition the controller device from the first state to a second state and output a second user interface at the display device, where the second user interface comprises second information at a second output size that is larger than the first output size.

Provided are embodiments for a heating, ventilation, and air conditioning (HVAC) system for providing sensor information and sensor communication over relay-controlled power line. The system can include a controller of the HVAC system and a first power line converter coupled to the controller. The first power line converter is configured to receive data over a serial bus, convert the data into a communication message for transmission onto a power line, wherein the power line is configured to transmit power and communication messages, and transmit the communication message over the power line. Also provided are embodiments for transmitting and receiving a communication message over relay-controlled power line.

Provided are embodiments for a heating, ventilation, and air conditioning (HVAC) system for providing sensor information and sensor communication over relay-controlled power line. The system can include a controller of the HVAC system and a first power line converter coupled to the controller. The first power line converter is configured to receive data over a serial bus, convert the data into a communication message for transmission onto a power line, wherein the power line is configured to transmit power and communication messages, and transmit the communication message over the power line. Also provided are embodiments for transmitting and receiving a communication message over relay-controlled power line.

The derivation unit determines the stability of a parasympathetic nerve activity of the sleeper for each environment temperature, and derives a correspondence relationship between the environment temperature and the stability of the parasympathetic nerve activity of the sleeper. An estimation unit estimates an appropriate value of the environment temperature suitable for the sleeper based on the correspondence relationship derived by the derivation unit.

A heating, ventilation, and/or air conditioning (HVAC) system includes a compressor having an impeller configured to rotate and drive a working fluid through a working fluid circuit of the HVAC system in an active operating mode. The HVAC system further includes a controller configured to, in response to receiving an input indicative of a transition to operate in an inactive operating mode, suspend the active operating mode by interrupting a supply of power to the compressor, adjust pre-rotation vanes of the compressor, a variable geometry diffuser of the compressor to a first position, or both to enable a backflow of the working fluid through the compressor for a first interval of time, and, after the first interval of time has elapsed, adjust the pre-rotation vanes, the variable geometry diffuser, or both to a second position to block the backflow of the working fluid through the compressor.

A heating, ventilation, and/or air conditioning (HVAC) system includes a compressor having an impeller configured to rotate and drive a working fluid through a working fluid circuit of the HVAC system in an active operating mode. The HVAC system further includes a controller configured to, in response to receiving an input indicative of a transition to operate in an inactive operating mode, suspend the active operating mode by interrupting a supply of power to the compressor, adjust pre-rotation vanes of the compressor, a variable geometry diffuser of the compressor to a first position, or both to enable a backflow of the working fluid through the compressor for a first interval of time, and, after the first interval of time has elapsed, adjust the pre-rotation vanes, the variable geometry diffuser, or both to a second position to block the backflow of the working fluid through the compressor.

An air-conditioning system includes a plurality of air-conditioning apparatuses that, in an indoor space that is divided into a plurality of air-conditioned areas, each condition air in a corresponding one of the plurality of air-conditioned areas, a wireless communication module that communicates with an information communication terminal to which pieces of setting information that are each set for a corresponding one of the plurality of air-conditioning apparatuses and represent operational details of the air-conditioning apparatus are input, and a controller that controls the plurality of air-conditioning apparatuses on the basis of the pieces of setting information communicated via the wireless communication module.

The present disclosure relates to a method of controlling operation state of multi-split air conditioner and system, and a heat pump multi-split. The control method includes: determining a target operation mode of each indoor unit according to an operation mode set by a user for the indoor unit; performing statistics on heat exchange demands of the indoor units corresponding to different target operation modes, and determining a dominant operation mode among the target operation modes according to the heat exchange demands; and using the dominant operation mode as the operation mode of an outdoor unit.