How do I change between Fahrenheit and Celsius temperature display?
Press the °F|°C button to toggle between Fahrenheit and Centigrade display modes. In Fahrenheit, temperatures are displayed in 1-degree increments with °F shown next to the value. In Centigrade, temperatures are displayed in 0.5-degree increments with °C shown next to the value. (Page 20)
From the official Honeywell Set Thermostat manual, page 20
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