Few things are more frustrating than turning on your AC during a Texas summer and getting nothing but warm air. If your air conditioner is running but not cooling, don't panic — there are several common causes, and some you can even troubleshoot yourself before calling for a repair. Check Your Thermostat First Before assuming the worst, check your thermostat. Make sure it's set to "cool" (not "heat" or "auto") and that the temperature is set below the current room temperature
