@dogstar have you inspected the Evaporator core? They tend to get very badly plugged with hair and stuff. I know of a number of folks that had giant hair/mildew mats on their evap cores and dealt with it numerous times as a mechanic, including on my own cruiser. You would have never known the PO had a dog with how clean the interior was, but the evap core looked like it swallowed a polar bear cub.
Also, though I would never recommend someone else repeat it, I had charged my AC with dustoff....which, though it is meant for cleaning keyboards and electronics is a refrigerant...Also flammable. However, on a 95* day the cruiser would put out air in the low 60's pretty easily. In fact, it got so cold a number of times that it froze the expansion valve.