The one in your link show thermostat options. What I am seeing looks like the hotel motel style units. If it is like that you can set the tempature by opening the door and pushing the buttons.
GE AZ61H15DAB Remote Thermostats.
Digital Remote Thermostat RAK148D1 +$68.80
.Programmable Digital Remote Thermostat RAK148P1 +$91.20
.Wall Mounted Wireless Programmable Remote Thermostat Transmitter (For RAK348R1) RAK348T1 +$199.00
.PTAC Mounted Wireless Programmable Remote Thermostat Receiver (For RAK348T1) RAK348R1 +$184.00