Hydrofluoroolefins (HFOs) are a class of organic compounds that contain hydrogen, fluorine, and carbon. They are unsaturated, meaning they have at least one double bond between carbon atoms. HFOs are primarily used as refrigerants and are considered more environmentally friendly alternatives to hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) because they have a lower global warming potential (GWP). HFOs are gaining popularity in various applications, including air conditioning and foam blowing agents. Their chemical structure allows them to break down more quickly in the atmosphere, reducing their long-term impact on climate change. As regulations tighten on high-GWP substances, HFOs are becoming a key focus in the transition to sustainable refrigerants.