UPM HTM621, Manual

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Select °C or °F (Celsius or Fahrenheit)
Press SET for 3 seconds to enter the option setting mode.
Press SET 3 times (until the temperature and °F / °C begins flashing)
Press UP or DOWN to toggle between the °F / °C setting.
Wait 15 seconds for normal display to return.
(See Option section for more details)
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CELSIUS DEFAULT: Since Celsius (°C) is the default mode, no action
is required to use the thermostat in this mode.
(°C or °F)*If you wish to use Fahrenheit* It is VERY IMPORTANT that you choose
Fahrenheit (°F) before you begin using the thermostat. If you proceed to
program the thermostat with the default Celsius (°C), and THEN change to the
Fahrenheit (°F) setting; all programs set by the user will be deleted.