Each year before you begin to use your air conditioner, it is important to call a professional out to do the repairs that are needed on the unit. This may include simply cleaning and checking to make sure it works. But, it prevents potential problems later.
When you need air conditioning repair because the temperature in any room of the home drops too long, consider the thermostat first. In some cases, the need is to have the unit recalibrated to fit the need that you have. Or, it could be installed incorrectly or in the wrong location.