What are the acceptable temperature ranges for heating and cooling?
For heating, the acceptable range is 40° to 90°F (4.5° to 32°C). For cooling, the acceptable range is 50° to 99°F (10° to 37°C). Make sure heating and cooling temperatures are set within these ranges. (Page 11)
From the official Honeywell Pro Th4210D manual, page 11
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