What is the acceptable temperature range I can set for heating and cooling?
The heat setting can be set between 40°F and 90°F (4.5°C to 32°C), while the cool setting can be set between 50°F and 99°F (10°C to 37°C). If your temperature settings are not changing, make sure you are staying within these acceptable ranges. (Page 11)
From the official Honeywell TH5110D Home Programmable Thermostat manual, page 11
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