How to Stop Your AC Now You can easily stop your AC unit from why wont my AC stop running running if you notice that the temperature in your home is uneven. This problem is usually caused by the thermostat being set incorrectly. You need to ensure that the temperature is on the cool setting and not on the heat setting or it will keep on running and cause a higher energy bill. Alternatively, you can clean the thermostat cover with a soft brush. These simple fixes will make sure that your AC runs smoothly in the future. A dirty air filter or registers can obstruct the evaporator coil. Other problems may include a leak in the refrigerant line, low refrigerant level, and even a dirty evaporator coil. An HVAC technician will be able to determine the exact cause of your freezing AC problem and prevent you from causing any further damage. Once the cause is identified, he will be able to determine the right steps to take to fix the problem. If your air conditioner does not turn off, it’s time to get it fixed. Not only does running an AC put too much stress on it, but it also decreases its life span. Additionally, the blowing air can also be caused by a leak in the refrigerant. Likewise, an insufficient amount of cooling can cause your AC to run indefinitely, so it’s best to get it fixed immediately.