What kind of freon is ised for an apartment freezer?

Most modern apartment freezers use refrigerants such as R-134a or R-600a (isobutane). R-134a is a hydrofluorocarbon (HFC) that has been widely used due to its effective cooling properties and lower environmental impact compared to older refrigerants like R-12. R-600a is a natural refrigerant that is more environmentally friendly and is increasingly being adopted in newer appliances. Always check the manufacturer's specifications for the exact type used in your specific freezer model.