Asked customer about issue he is having, he informed me that some mornings the unit will overheat the home by several degrees. Inspected the thermostat, and thermostat wiring. Checked for shorts in all low voltage wiring. No problems were found. Looked up thermostat manual to see if there were any over cool or overheat settings. There were none. There was an option to reset the thermostat if it was doing anything out of the ordinary. I reset the thermostat and told the customer that if that doesn't take care of it then he will need a new thermostat. I told him the prices of ours, and also told him that if he bought a single stage cool and dual stage heat heat pump thermostat he could install it himself if he wanted. Everything is working fine.