HFCs were the first type of refrigerant to be produced.

Hydrofluorocarbons (HFCs) were not the first type of refrigerant produced. The early refrigerants included substances like ammonia, methyl chloride, and carbon dioxide, which were commonly used before HFCs were developed. HFCs became popular in the late 20th century as alternatives to the ozone-depleting chlorofluorocarbons (CFCs), but they came into use well after many other refrigerants had already been introduced and utilized in various applications. This historical context is crucial in understanding the timeline of refrigerant development and the roles different substances have played in refrigeration technology.