the invention comprises systems and methods for detecting the use of networked consumer electronics devices as indications of occupancy of a structure for purposes of automatically adjusting the temperature setpoint on a thermostatic hvac control . at least one thermostat is located inside a structure and is used to control an hvac system in the structure . at least one networked electronic device is used to indicate the state of occupancy of the structure . the state of occupancy is used to alter the setpoint on the thermostatic hvac control to reduce unneeded conditioning of unoccupied spaces .