Contrary to popular belief, your car's air conditioning system serves many purposes beyond just keeping the interior cool in hot weather. When operating optimally, the air conditioner filters out pollutants, bacteria and pollen, helping to improve the air quality inside your car. But with increased usage, the amount of refrigerant gas in your car's air conditioning system decreases. To keep your air conditioning system running at its best, car manufacturers recommend opting for an Air Con Regas Corby at least twice a year.