Can you use R134 instead of R22 in a window ac unit?

Using R134a instead of R22 in a window AC unit is not recommended, as they have different properties and pressure requirements. R22 is a high-pressure refrigerant, while R134a operates at a lower pressure, which can lead to inefficiencies and potential damage to the system. Additionally, the oil compatibility and system design may not support the use of R134a. Always consult a professional or refer to the manufacturer's guidelines before making any refrigerant changes.