Why Loss of refrigerate in a Ac unit is not always due to a leak?

Loss of refrigerant in an AC unit can occur for several reasons beyond just leaks. It may be due to improper installation, where the system was not charged correctly, or from a malfunctioning component like a valve or compressor. Additionally, wear and tear over time can lead to inefficiencies that result in refrigerant loss without a visible leak. Regular maintenance is essential to identify and address these issues before they lead to significant problems.