When you have a running compressor, but your air conditioning unit is not producing cool air, there are potentially a number of things that could be causing this problem. The first areas that should be checked can be completed easily and quickly. These are fixes which should be accessible to any home owner. If these actions do not fix the problem it may be time to bring in the experts from JMD Corporation/Jackson Heating and Air to further diagnose what to do when your air conditioner is running but not cooling.
Before you assume the worst, run through this quick and easy list of common sources of malfunction that often decrease air conditioning efficiency. You should be able to run through this list fairly quickly.
Make sure that all windows and doors are closed.
Make sure your supply and return vents are open and unobstructed.
Make sure that your thermostat is set to cool, and is turned down below room temperature.
Ensure that you have any humidifiers turned off.
Some units may even have a red reset button on your outdoor unit near the refrigerant line. If you can find this, try pushing it. Sometimes a simple system reset will correct the problem.