When selecting refrigeration for HVAC systems in residential buildings, it is important to avoid some common mistakes. Firstly, it is important to ensure that the refrigerant chosen is compatible with the system. Refrigerants have different properties and can cause damage to the system if not chosen correctly. Secondly, it is important to select a refrigerant with the correct capacity for the system. If the capacity is too low, the system will not be able to cool the space efficiently. Lastly, it is important to ensure that the refrigerant is installed correctly. Improper installation can lead to leaks and other issues that can cause damage to the system.