How do I adjust the temperature on my Honeywell T4 Pro thermostat?
From the home screen, press the Plus or Minus buttons to adjust the temperature. The thermostat will hold this setting until the next programmed time. To make changes to your scheduled settings, use the Plus or Minus buttons to navigate through options and press the Select button to confirm your choices.
From the official Honeywell T4 Pro Thermostat manual, page 2
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