The first thing I'd do is open the filter grill on the ceiling and look up inside with a flashlight.
Look for ice on the cooling fins or dirt build up on those fins. If they're dirty, clean them. If they are frozen, you've got low coolant.
If low coolant, you'll have to replace the rooftop unit. I've heard you can get the unit serviced, but never came across anybody able to do it.
If the fins aren't dirty or iced over, then go up on the roof and remove the cowl. Check to see if the fan is blowing and that the fins are clean, etc.
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