Thermostat with integrated submetering and control

A thermostat for controlling HVAC equipment for a building, the thermostat being mounted within a cabinet enclosing the HVAC equipment, comprising:

• one or more current sensing inputs electrically connected to current transformers magnetically coupled to one or more phases of an electrical supply powering the HVAC equipment within the cabinet;
• one or more voltage sensing inputs configured to receive voltages indicative of the one or more phases of the electrical supply powering the HVAC equipment within the cabinet;
• one or more control signal outputs configured to generate HVAC control signals, the HVAC control signals coupled to control inputs of a controller board of the HVAC equipment;
• one or more temperature sensing inputs configured to sense temperature of a zone within the building controlled by the HVAC equipment;
• a central processor configured to calculate real time energy use based on the voltage and current measurements, the processor further configured to control the HVAC unit to keep the zone within the building within a temperature range based on set points stored within the thermostat and from data from the one or more temperature sensing inputs;
• a memory for storing energy use calculations;
• and
• a communications port for sending energy usage calculations to an external device.