How do I set a permanent temperature override (Hold)?
Press the HOLD button to permanently adjust the temperature and turn off the program schedule. Then press the up or down arrow to set your desired temperature, which will be maintained 24 hours a day until you manually change it or press Cancel to resume the program schedule. (Page 41)
From the official Honeywell RTH6580WF Wi-Fi Smart Thermostat manual, page 41
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