What are the acceptable temperature ranges for heating and cooling?
The acceptable temperature ranges are: Heat setting between 40° to 90°F (4.5° to 32°C), and Cool setting between 50° to 99°F (10° to 37°C). If temperature settings do not change, make sure they are within these acceptable ranges.
From the official Honeywell Focuspro TH5220D Thermostat manual, page 5
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