You should never have to replace your refrigerant. If refrigerant levels in your system are low, it may be indicative of a leak. Before you add more refrigerant, the leak needs to be fixed. Avoid contractors who would simply pour more refrigerant into the system without checking for and fixing a leak.
R-22 refrigerant may not be used in newly manufactured air conditioners, but it is still found in A/C units installed previously. R-22 is considered damaging to the ozone layer when it is released into the atmosphere, as is the case when a leak is present.
A refrigerant leak may reduce the energy efficiency of the system, may cause significant damage to the compressor and may even freeze the evaporator coil. If your refrigerant levels are low or if you notice a refrigerant leak, it is important that you seek the services of a qualified contractor, such as All Year Cooling, to fix the problem right away.