"A weakened capacitor attached to a compressor will lead to a condition called “hard starting”. In such cases the A/c will struggle to turn on and then shut off again soon after. This puts immense pressure on compressor and the other parts of the AC. This should be taken care of ASAP.The cost of an A/c capacitor would range between $10-100. It will vary with brand and model and if single or dual-voltage. Some original equipment manufacturers may offer them for $200."