Air conditioners with R22 refrigerant

R22

— it is the most "old" of the refrigerant type found nowadays for air conditioners. It is distinguished by low cost, low operating pressure (which has a positive effect on the reliability and price of the cooling circuits themselves) and uniformity of composition, which allows, in case of a refrigerant leak, not to change it entirely but simply to replenish the system with the required amount of liquid. However, R22 is environmentally unsafe (mainly for the ozone layer), which is why nowadays it is gradually being replaced by more advanced compounds.