Solution: Hydrofluorocarbons (HFCs) are greenhouse gases (GHGs) commonly used in a wide variety of applications, including refrigeration, air-conditioning (AC), building insulation, foam agents, and aerosols with minor uses as solvents and for fire protection.

(https://www.epa.gov/snap/reducing-hydrofluorocarbon-hfc-use-and-emissions-federal-sector-through-snap)

HFCs are also used in Lubricants (https://www.osti.gov/biblio/215711)

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