Kerry is at work and her HabiStat Pulse Proportional Thermostat as arrived, I have set it up for her the probe is in the middle as directed on the set up sheet, i have set it at 80. So the Temp range is now 85 in the hot area 80 in the middle and 70 in the cool end. Is this ok or do i need to turn the heat mat which is in the cool end on too.