What type of refrigerant is commonly used in modern heat pump systems?

R-410A is the commonly used refrigerant in modern heat pump systems due to its high efficiency and low environmental impact compared to earlier refrigerants. R-410A has a higher pressure capacity, which allows it to transfer heat more effectively between the indoor and outdoor units of a heat pump. Additionally, it is designed to replace R-22, which is being phased out due to its ozone-depleting potential. This phase-out has made R-410A the preferred choice for new installations and replacements, as it does not contribute to ozone depletion and has a relatively low global warming potential in comparison to some older refrigerants.

This selection aligns with current industry standards, where manufacturers are focusing on environmentally friendly options.