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Honeywell H8908ASPST Low-voltage SPST Manual Humidistat. for better control of you home’s humidification dehumidification ventilation and even bathroom fans into a single device with Honeywell’s TrueIAQ control. TrueIAQ allows you to program your air quality and fan settings individually or as a system for increased comfort and energy savings. Plus TrueIAQ will automatically adjust settings for changes in outside temperature and humidity and provides maintenance reminders to help keep your equipment operating at peak efficiency.