Thank you for that analysis. Thermostats displayed Heat.
Your blower would be in the roof top AHU and would be accessible from the roof. Obviously the refrigerant lines from condensing unit feeds the A coil you saw from inside. My guess is it was intended to have a Roof top package unit and at some point they decided to create this hodgepodge instead of the package unit. The other condensing unit feeds the downstairs AHU. Electric heat is typical on the downstairs ceiling AHU although heat pumps can be found.