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When the heat anticipator in your thermostat is out of adjustment, it can cause the furnace to "'''short-cycle'''" (turn on and off frequently) or to exceed or never reach the desired thermostat heat setting. Fortunately, this problem is often easy to correct by adjusting the heat anticipator.When the heat anticipator in your thermostat is out of adjustment, it can cause the furnace to "'''short-cycle'''" (turn on and off frequently) or to exceed or never reach the desired thermostat heat setting. Fortunately, this problem is often easy to correct by adjusting the heat anticipator or replacing an old thermostat. Adjustment: If the furnace is cycling on and off too frequently, move the heat anticipator adjustment lever closer to the "LONGER" setting and if the furnace is exceeding or never reaching the desired set temperature, then move the adjustment lever away from the "LONGER". * The highest (1.2A) position gives the longest heat-on cycle. (max value dependent on model)* The 0.1A position gives the shortest heat-on cycle in thermostat heat* Honeywell warns to never set the T87F series heat anticipator below 0.3A. Honeywell Thermostat Heat Anticipator Settings: Honeywell specifies the following amp settings for their CT87 thermostats, based on the heating system type: * 1.2 - Steam* 0.8 - Hot Water heat* 0.8 High Efficiency Hot Air* 0.4 Standard Hot Air* 0.3 Electric Heat The anticipator was replaced by a thermistor in newer designs. Electronic thermostats do not use a physical anticipator due to the microprocessor controlled temperature and delay in shut off. In a mechanical thermostat which has no microprocessor, clock, or timer the heat anticipator's purpose is to reduce the temperature swing caused by the system, and to increase overall efficiency. It does so by creating false heat, which increases the thermostat's rate of response. Defective Anticipator: If the heat anticipator is malfunctioning, your furnace will short cycle and the room temperature will not reach the temperature displayed on the thermostat. Typical lifespan or the anticipator and mechanical thermostat is approximately ten years.