Maintaining a ductless mini split system is essential in order to make sure your system is running efficiently and effectively at all times. Generally, general maintenance should be carried out on a yearly basis or anytime the user notices any changes in efficiency or performance. This includes checking for any warning lights that may have come up and cleaning the filters, as dirt can accumulate and decrease efficiency. Additionally, it is important to inspect all components of the system, such as fan coils, condenser coils, heat exchangers, refrigerant lines, grilles or louvers (if applicable), drain pans and drains to ensure proper function. Regularly scheduled professional tune-ups can help maintain air quality and keep units running properly so they last longer and carry out their job more efficiently.