Which kind of coolant is commonly used in RV refrigeration systems?

The commonly used coolants in RV refrigeration systems are R-134A and R-600A. R-134A is a widely utilized refrigerant in both automotive and RV applications due to its effective cooling properties and lower environmental impact compared to older refrigerants. It is non-toxic and non-flammable, making it safer for use in many types of refrigeration units.

R-600A, also known as isobutane, is being increasingly used due to its efficiency and eco-friendliness, particularly in newer and more energy-efficient refrigeration units. These refrigerants have properties that allow them to function well in the temperature ranges required for refrigeration systems in recreational vehicles, striking a balance between cooling capability and safety.

Other refrigerants mentioned in the other options either belong to older categories that are less commonly used now, or they may not be as suitable for RV applications due to differences in their physical and chemical properties. This makes R-134A and R-600A the best choice for RV refrigeration systems today.