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Hi, the first thing that needs to happen is that the evaporator coil needs to be blown and cleaned. the best way to do this effectively is from the roof. take the cover off the top, and unscrew the front metal plate that covers the evaporator, then blow and clean it off...........this is where the 'heat exchange' takes place, and will not be effective if it is covered with dust ect.. please get back to me , and we can discuss this further thanks Michael
here is an exploded view showing the evaporator, and while you are up there blow out the condenser unit, as well as any leaves ect you see