Horizontal, mercury-free, snap action mechanical thermostat | Compatible with single-stage heating, cooling, and heat pump systems, without aux | Can be used with conventional oil, electric, and gas systems, 2 or 3-wire zone valve and millivolt applications | Features enclosed snap action contacts for increased accuracy and reliability | Resistant to vibration | Operating range: 50° F to 90° F | Five year warranty | Includes heat/cool sub-base
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