Arrived to home and I was here during the summer when the heat would not turn off. I was under the impression they were going to replace the tstat on their own last visit because the stat was bad. The got them up and running with cooling. This visit it won’t switch over again because the tstat was not replaced so I bypassed it to come on in heating but it’s the same situation, when summer comes around cooling won’t work. I know they want that specific nest thermostat. But we may be able to find one it may not look the same and match the other stat. I couldn’t reach the dad again to go over this but if he calls the office I would be happy to explain. My recommendation would be to install a ecobee tstat, they are excellent units and dependable. I will leave an estimate since I couldn’t offer as the owner was not home his son was. Unit running at departure