Installed 5 new customer supplied nest e thermostats, set them up on one phone. Couldn’t set up multiple accounts at this time. completed repairs, re-run the tstat wire on 3 new locations, replace 1 gas valve, replace and rerun power for 2 units all the way to the breaker box. Leaving one unit because of a failed heat exchanger, the other because it has been damaged. In the off position. Removed old mercury thermostat for disposal