What temperature ranges can I set for heating and cooling on the TH6220D?
The heating temperature can be set between 40°F and 90°F (4.5°C to 32°C), while the cooling temperature can be set between 50°F and 99°F (10°C to 37°C). If your temperature settings do not seem to change, verify you are within these acceptable ranges. (Page 18)
From the official Honeywell Focuspro Th6220d manual, page 18
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