The simple way to test an air conditioning system to determine if it is functional is to wait for a 24 hour period when the exterior temperature is above 65 F degrees. Testing air conditoinig units when it is much cooler out can eitehr burn out the compresser as it tries to compress liquid referigerant or yeild a false result.
If they system is not producing a 15 to 20 degree difference between the air coming out the registers and that going back into the return the system is not functioning properly.
Contracry to what you may hear adding refrigerent to a system is not normal, it is a sign of a potentially serious leak that can be very expensive to cure.
If you do not get the 15 to 20 degree F temperature drop the next step is to have the air conditioning system cleaned, adjusted, repaired and tested by a qualified person. The service person must be asked to provide certification no refrigerant leaks exist, that the system is operating effectively after the necessary corrective action has been taken, or perform the necessary replacement(s), prior to expiration of your inspection contingency.
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