*PLUMBERSSTOCK EXPERT* responded:
Hi, there! Thank you for taking interest in our LuxPro PSDH121 digital heat pump thermostat. To set the desired temperature, you must first select the system switch between HEAT or COOL depending on the climate, then, simply press the temperature up/down keys. It will show you the current temperature. Press the up/down keys again to select the desired temperature. You can also refer to this operating manual for more details. Hope this helps. Thank you and we hope to see you again here at PlumbersStock.com!