Honeywell TP971A2086 Pneumatic Day/Night Thermostat 20-25 PSI 60°-90°F

The Honeywell TP971A2086 is a pneumatic day-night thermostat that uses less energy to keep your room at a suitable temperature. It uses 20 to 25 psi of compressed air pressure to operate two-pipe HVAC systems, such as furnaces and boilers. It automatically adjusts to a lower nighttime setting between 50°F and 80°F after maintaining a setpoint between 60°F and 90°F during the day. By lowering the heating or cooling while you're sleeping or away, this dual-temperature control contributes to energy conservation. It's straightforward construction and manual dials make temperature adjustments simple, and it runs without energy or batteries. The TP971A2086 provides dependable temperature management and energy savings for older pneumatic HVAC systems, albeit lacking the feature-richness of contemporary smart thermostats.