Abstract: There is disclosed a thermostat controlled apparatus which controls the operation of a heating system and a cooling system in response to temperature variations in a given environment. The thermostat has a three-electrode mercury switch which is coupled to a single bimetallic element which rotates the switch in response to temperature variations. The switch has a housing containing a pool of mercury and three electrodes extending within. A common electrode is connected to a voltage source. A second electrode is connected to the cooling system. A third electrode is connected to the heating system. Tilting the switch clockwise causes the mercury to connect the second and common electrodes, thereby energizing the cooling system; tilting the switch counterclockwise causes the mercury to connect the third electrode and common electrode, thereby energizing the heating system.

Abstract: There is disclosed a thermostat controlled apparatus which operates to control operation of a heating system and a cooling system in response to the temperature detected in a given environment. The thermostat has a pair of mercury switches which are coupled to a single bimetallic element which switches are inclined, one with respect to the other. The circuit configuration is such that one switch controls the heating operation while the other switch controls a cooling operation. Heating and cooling occurs within a predetermined range which is adjustable by means of the angular positions of the switches with respect to the bimetallic coil. In this manner one switch will control the heating operation and the other switch controls the cooling operation. There is an area between the setting of the thermostat wherein neither switch operates but during this mode a separate fan is energized to provide air circulation for the given environment.

Abstract: A housing contains two thermostats which thermostats are interwired so as to enable one thermostat to control a heating operation and the other thermostat to control a cooling operation. The housing contains at least one AC power receptacle coupled to the heating thermostat and one AC power receptacle coupled to the cooling thermostat. In this manner a heater would be plugged into the one receptacle while an air conditioner would be plugged into the other receptacle. The individual thermostats would be set for a temperature heating range being the difference between the settings. The wiring between the thermostats causes the heating thermostat to come on when the temperature falls below the values set. This in turn causes the plugged in heater to operate. When the temperature is above a value set by the heating thermostat, the unit removes power from all AC receptacles.