Disconnect switch outside for the AC unit was switched off. Unsure as to why. It had to have been thrown by hand, it's not something that can fall on its own. Ecobee thermostats were wired with the power extender kits. They are not needed because there are enough wires going to the thermostats. Removed power extenders and wired up both thermostats correctly. Smoke detector for the 5 ton system was also wired incorrectly. It is now interfaced with the system to properly shut it down in the event of a fire. Both ACs are now functioning normally at this time.