What are the two main types of refrigerants used in HVAC systems?

The selection of chlorofluorocarbons (CFCs) and hydrofluorocarbons (HFCs) as the correct answer highlights the significance of these refrigerant categories in HVAC systems. CFCs were once widely used due to their effective cooling properties and stability; however, because of their ozone-depleting potential, their usage has been largely phased out under international agreements like the Montreal Protocol. HFCs emerged as successors to CFCs and became popular because they do not deplete the ozone layer, although they do have a global warming potential, leading to ongoing regulatory scrutiny.

In a contemporary context, knowledge of both CFCs and HFCs is crucial, as understanding their history and regulatory environment can help HVAC technicians navigate the transition towards more environmentally friendly refrigerants. Familiarizing oneself with these refrigerant types allows for a deeper comprehension of refrigerant phase-out strategies and the importance of adhering to environmental legislation in HVAC practices.