3. Navigate to the Temperature Scale Setting. Using the arrow keys or buttons on the thermostat, navigate to the temperature scale setting.Look for options labeled "Temp Scale," "Units," or "Format." 4. Select Fahrenheit. Once you find the temperature scale setting, use the arrow keys or buttons to select "Fahrenheit.". 5. Save the Changes.. In this video I show you how to change between Fahrenheit and Celsius on the Honeywell Pro Series Thermostat. I take you through how to change between Fahren.
Are you tired of constantly converting Fahrenheit to Celsius when setting your Honeywell thermostat? Do you long for the simplicity of a Celsius-based system? This guide will walk you through the process of how to change Honeywell thermostat from F to C, making your home's temperature control effortless and intuitive.. To switch between celsius and fahrenheit on Honeywell RTH6500WF Smart Series. To change between celsius and fahrenheit on the Honeywell RTH6500WF series, press Fan and and the up button and hold them for about 3-5 seconds. The screen will change to display two numbers. And on the button options you should see Done, Back, blank, Next.