Abstract: A method includes receiving thermostat data from a thermostat over an initial time period. Weather data is received from a weather service for the initial time period, the thermostat data is synchronized with the weather data with respect to time. The synchronized thermostat and weather data are separated into a plurality of subperiods of the initial time period, each of the subperiods covering substantially equal time. At least one machine learning model is trained using the synchronized thermostat and weather data that is separated into the plurality of subperiods. Typical annual weather data for a location of the building is received and the trained machine learning model is used with the received typical annual weather data, the received thermostat temperature setpoint data, and at least one change to a parameter that impacts energy consumption by the building to determine an expected change in energy consumption by the building.

Abstract: A method of HVAC system performance monitoring using a computing device connected to at least one thermostat of an HVAC system in a building includes receiving thermostat data from the thermostat, the thermostat data including temperature setpoint data, measured building temperature data, and HVAC operation data for a time period. Weather data is received from a weather service for the time period, and the thermostat data is synchronized with the weather data with respect to time. At least one machine learning model is trained using the synchronized thermostat and weather data, and performance of the HVAC system over time is monitored using the trained machine learning model.

Abstract: A vapor compression system includes a compressor including a compression stage for compressing a working fluid, a first heat exchanger downstream from the compressor that receives and cools the working fluid, a second heat exchanger downstream from the first heat exchanger and upstream from the compressor that receives and heats the working fluid, and an accumulator positioned between the second heat exchanger and the compression stage. The accumulator defines an interior volume for containing a vapor phase and a liquid phase of the working fluid, and the accumulator includes an inlet to receive the working fluid from the second heat exchanger and an outlet to allow the vapor phase of the working fluid to exit the accumulator and flow towards the compression stage. The accumulator atomizes the liquid phase of the working fluid into droplets and introduces the droplets into the vapor phase of the working fluid exiting the accumulator.

Abstract: A vapor compression system includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, a first valve, and a second valve. The compressor has an inlet connected to a suction flow and an exit connected to a discharge flow. The first valve is movable to connect the discharge flow to one of the indoor and outdoor heat exchangers. The second valve is movable to connect the suction flow to one of the indoor and outdoor heat exchangers.

Abstract: A method of HVAC system performance monitoring using a computing device connected to at least one thermostat of an HVAC system in a building includes receiving thermostat data from the thermostat, the thermostat data including temperature setpoint data, measured building temperature data, and HVAC operation data for a time period. Weather data is received from a weather service for the time period, and the thermostat data is synchronized with the weather data with respect to time. At least one machine learning model is trained using the synchronized thermostat and weather data, and performance of the HVAC system over time is monitored using the trained machine learning model.

Abstract: A wiring distribution system including connectors, tools, and methods is provided for building wiring. The mechanical and electrical interconnection is performed to the individual connector components in a crimping operation to the individual wires after removal of the outer covering. Using panels with apertures for accepting interchangeable connectors reduces the layers of connecting panels used between a wallplate and a computer.