Several manufactures have developed new systems that contain environmentally-friendly refrigerants such as R-410A and similar blends. 410A is a chlorine-free coolant that is safe for the Earth’s ozone-layer and delivers superior cooling than traditional refrigerants. In fact, since 2010, systems that used R-22 are being phased out. R22 has been price indexed and the purchase price will continue to increase until it becomes uneconomical to purchase