Abstract: A HVAC controller system including a control unit including a first connection device and a wall plate module, including a wall plate board assembly and second connection device disposed on the wall plate board assembly, wherein when the control unit and wall plate module are engaged with one another, the first connection device and the second connection device are in contact with one another.

Abstract: An HVAC control mounting assembly including a housing, including at least one communication module receptacle, and a communication module disposed in at least one of the at least one communication module receptacles. An HVAC controller assembly including an HVAC control unit, and a mounting assembly operably coupled to the HVAC control unit the mounting assembly including: a housing including at least one communication module receptacle disposed therein, and a communication module disposed in at least one of the at least one communication module receptacles.