Automatic changeover thermostat with single bi-metal and common set lever having individual heat and cool setpoint indicators

An automatic changeover thermostat for controlling heating apparatus and cooling apparatus for heating and cooling a conditioned space, comprising:

• a base member;
• a single temperature responsive element mounted for rotation relative to said base member;
• a heating switch for initiating operation of said heating apparatus when said temperature falls to a first level and for interrupting operation of said heating apparatus when said temperature rises to a second level;
• a cooling switch for initiating operation of said cooling apparatus when said temperature rises to a third level, said third level at least 2.degree. F. warmer than said second level;
• a changeover switch for selectively enabling said heating switch when said temperature falls to said first level and selectively enabling said cooling switch when said temperature rises to said second level;
• said heating switch, said cooling switch and said changeover switch mounted to said single temperature responsive element;
• operator adjustment means comprising a single lever coupled to said temperature responsive element for limited rotation of said temperature responsive element relative to said base member, said lever having a heat set point indicator and a cool set point indicator spaced apart;
• and
• a temperature scale located adjacent said heat set point indicator and said cool set point indicator, said lever movable for positioning said set point indicators along said temperature scale.