Final answer:
R-410A is the only EPA SNAP approved "drop-in" replacement for R-22, offering eco-friendly performance by not harming the ozone layer.
Step-by-step explanation:
The only EPA SNAP approved "drop-in" replacement for R-22 is R-410A. This refrigerant is widely used in new air conditioning systems as a replacement for R-22, which is being phased out due to its ozone depletion potential. R-410A was developed to meet environmental standards and provide similar or improved performance compared to R-22 without depleting the ozone layer.