Arrived on site, found thermostat with the option for a reboot. Customer stated they had tied that multiple times and would just wind stuck again. Customer stated that it had not been working after they returned after the storm and found no power in the home. Turned off power at both the indoor and outdoor units. Then powered on outdoor condenser and waited a few minutes before powering on indoor. Thermostat indicated an update was occurring, but customer stated this is what it was doing before I arrived. Thermostats was able to complete the update and complete system came on without issue. Measured a 20 degree temperature split. Allowed unit to run for 30 mins without issue. Discussed surge protection with the home owner and walked him through how to reset power on the system himself should this issue occur again. Homeowner declined surge protection at this time, but was open to the idea in the future. System in good working order upon departure.