Replace air conditioning unit

Does the light on the button come on when you turn on the a/c? Can you hear the compressor clutch engage when you turn it on? There are several reasons why your a/c doesn't work. Ranging from electrical problems (switches, relays, wiring, sensor etc) to mechanical problems (leaks, blockage, worn clutch, compressor failure etc). We would need to run some tests for you to find the fault before providing an estimate.