Which refrigerants are most commonly used in modern HVAC systems?

HFCs, or hydrofluorocarbons, are the most commonly used refrigerants in modern HVAC (Heating, Ventilation, and Air Conditioning) systems. This is primarily due to their favorable properties, including lower ozone depletion potential compared to older refrigerants like CFCs and HCFCs. HFCs do not contain chlorine, which is the element responsible for ozone layer depletion, making them more environmentally friendly options in refrigeration applications.

In recent years, there has been a global move towards phasing out substances with high global warming potential, including many HFCs, in favor of even more sustainable refrigerants, but HFCs remain prevalent in contemporary systems due to their efficiency and effectiveness in heat transfer and cooling processes.

On the other hand, CFCs (chlorofluorocarbons) have been largely phased out due to their significant impact on ozone depletion, while HCFCs (hydrochlorofluorocarbons) are also being phased out because they still contribute to ozone depletion and have high global warming potential. Thus, the ongoing use of HFCs marks them as the most relevant choice for current HVAC applications.