How is the aimed temperature range calculated on the STC-1000?

The aimed temperature range is defined as F1 minus F2 on the lower end (below which heating is triggered) and F1 plus F2 on the upper end (above which cooling is triggered). Both F1 and F2 must be configured to set the range correctly. (Page 2)

From the official Tense Stc 1000 Thermostat manual, page 2

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