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The Aprilaire Thermostat is a universal programmable thermostat. The Model 8476 thermostat combines the features of the Model 8466 universal programmable thermostat with Event-Based Control of the HVAC system’s fan. This allows you to automatically circulate air throughout your home periodically throughout the day or for a specific period of time to provide greater comfort through cleaner air and more even temperatures. This model is designed to tell you when it is time to change the air filter.