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Do you have just one LP furnace or two? And are these ceiling or floor vents?
Can you hear if the compressor is running? You can usually hear the "humming" of the compressor. IF NOT, it can be the thermostat or some other issue, but once I know if the compressor is running or not. The model number of the A/Cs is usually visible once you remove the ceiling grill. Mach units are usually 733 or 833 as the starting part of the numbers. Get back to me with this and I can assist you further here. All follow ups are included in our fee.
Were you able to find out which models of A/Cs you have?