The short answer is , but there are some important "fine print" details you should know to stay on the right side of the law (and your car's health). The "Small Can" Loophole for DIYers

Standard 30 lb tanks used by professional shops.

If you’re looking for R22 or R410A for a home AC unit, you’ll need Section 608 certification regardless of the container size. 2026 and the Road Ahead

These cans are designed specifically for Motor Vehicle Air Conditioners (MVAC) and must now come equipped with to prevent accidental leaks into the atmosphere. When You Actually Need a License

In the United States, you to buy small cans (2 lbs or less) of R134a refrigerant for automotive use. However, federal law requires a certification for larger bulk quantities, and some states have stricter rules. Quick Buying Guide