What temperature ranges can I set for heating and cooling on the TH3000?
The acceptable temperature setting range for Heat mode is 40°F to 90°F (4.5°C to 32°C). For Cool mode, the acceptable range is 50°F to 99°F (10°C to 37°C). If your temperature settings are not changing, verify that you are within these ranges. (Page 11)
From the official Honeywell TH3000 Programmable Thermostat manual, page 11
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