How do I temporarily change the temperature without affecting my programmed schedule?
Press the Warmer or Cooler key to adjust the temperature; a TEMPORARY indicator will appear on the display. The temporary change will cancel itself automatically at the next scheduled program change, or you can cancel it sooner by pressing the Run Program key. (Page 16)
From the official Honeywell CT3355 Home Programmable Thermostat manual, page 16
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