[TommyT]

We've had our vendor come out two times about cooling issues. After getting nowhere, had an outside vendor check the unit and said the ductwork is wrong. They stated the supply vents are to close to the return vents thereby removing the conditioned air before it enters the room. The correct supply vents should be above the windows, blowing toward the window in summer and winter. The return vent should be close to the exit door for the room.
I've learned to live with it because it would cost too much to change now...