I did attempt to check things out a little further this morning. Couldn't get the cover off of the breaker box so I gave up on that. All wire nutted connections behind the thermostat are good.
I removed the grate in the ceiling to check things out. A click can be heard when the thermostat is moved from from the "cool" to "off" positions. A check of the terminal board in the ceiling shows 27.6 volts on the GH terminal, which leads me to believe that there's power to the A/C unit.
So from here I'm thinking it's time to have a professional check the thing out.
1999 Designer 2930
2016 Ford SuperCrew/6.2/6.5 bed