These thermostats with a sturdy steel cover are provided with a liquid filled sensing element. This element is formed to achieve maximum sensitivity to surrounding air temperature changes. Coupled with a highly efficient diaphragm and leverage mechanism, the element operates a totally enclosed Penn switch contact with a close differential switching action without the use of ΓÇ£heat or coolΓÇ¥ anticipators. THERMOSTAT, HTG/CLG SPDT,KNOB ADJ, HVY DUTY, HEAT-OFF-COOL S
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