Electronic thermostatic control for a heat/cool room air conditioning system

In a heat/cool room air conditioning system having a temperature sensor positioned above or below the comfort zone of the room space, an electronic temperature differential thermostatic control circuit operable during the heating and cooling modes of operation comprising:

• a comparator circuit having a pair of input terminals and an output terminal and being switchable between two output states dependent on the relative polarity of two potentials applied to the input terminals;
• means for applying to a first of the input terminals a reference potential representative of a setpoint temperature for the room comfort zone;
• means including said temperature sensor for applying to the second of said input terminals a variable potential representative of sensed air temperature outside the comfort zone;
• feedback means coupling the comparator output to one of the input terminals for establishing a temperature differential between two sensed temperatures at which switching of the comparator occurs from one state to another and back, respectively;
• and means including a heat/cool mode switch for altering the effect that the feedback means has on the temperature differential between a first predetermined effect operative during the cool mode to a second predetermined effect operative during the heat mode;
• whereby the control circuit compensates for the opposite influence that air temperature stratification has in the heat and cool operating modes on the disparity between the sensed air temperature and the actual comfort zone temperature.