Upon arrival I was told that thermostat in back clinical area wasn’t working. Found thermostat was satisfied upon arrival so I called for more heat by increasing temp. Went to roof and checked operation. Found no faults or problems, system satisfied thermostat. Walked around building to find same electrical box that was at Manassas. They look to be brand new and speculating they are a backup power source for equipment. Panel is only labeled suite 104 which is the express care. Can’t be a coincidence that both locations that have brand new electrical boxes were calling for service because of power failure to thermostats. Speculating electrical work was done earlier in the day and when power was restored, systems started working again. Units operating normal.