How-to change the temperature scale in HS3.
In HS3 the Temperature Scale can be changed between Fahrenheit and Celsius. To do so, navigate to Tools->Setup. On the General Tab, look for the Other Settings section. Within that section there is a "Change Temperature Scale" option.
Note: Once the scale has been changed, any devices that report temperature will need to be removed and then re-added for the change to take effect. For help on this, see the article on Add/Removing Devices