Aprilaire 8400 Series Thermostat User Guide
About Your New Thermostat All 8400 series thermostats Large, clear, backlit display is easy to read – even in the dark. Displays room temperature, temperature setting, and optional outdoor temperature. Front battery door access for fast, easy replacement. Built-in compressor protection. Circulation fan mode for air cleaning. Air filter, humidifier, dehumidifier, and HVAC service indicators. … Read more