If your AC is not cooling your home properly, you may need to schedule a service call to fix the problem. The first step is to check the unit for a leak or a malfunctioning component. If you hear strange banging or buzzing noises coming from your unit, it is likely the compressor is malfunctioning. It may also be time to replace the ductwork. It is important that the air flow is correct to ensure that your air conditioner is functioning at optimal levels.