Flush wall mount thermostat and in-set mounting plate for a heating, ventilation and air conditioning system

A heating ventilation air conditioning (HVAC) thermostat controller, comprising:

• a mounting plate having front and back sides, said front side being defined by a recess having a geometric shape and formed therein and a wall covering flange extending around a perimeter of said recess and further comprising an electrical block pin connector located and fixed within said recess and extending outwardly from said front side of said recess, said back side being defined by a raised surface geometrically corresponding to said geometric shape of said recess;
• and
• a controller housing having a front panel having an outer edge oriented toward a rear of said controller housing and with vents located therein and that includes a display screen, and a back panel coupled to said front panel and having and outer edge, oriented toward a front of said controller housing and with vents located therein, wherein said outer edges of said front panel and said back panel oppose each other when said front panel and said back panel are coupled together and wherein an exterior surface of said back panel has a raised surface that has a geometric shape that corresponds to a geometric shape of said recess and is configured to be received within said recess of said mounting plate, such that said vents of said outer edges of said front and back panels are uncovered when said back panel is received with said recess of said mounting plate, said back panel further including an electrical block pin connector affixed thereto and configured to cooperatively engage said electrical block pin connector of said separate mounting plate to provide an electrical connection between said mounting plate and said controller housing.