Our technicians will check and test the functions of air conditioners before the cleaning procedure. If your units are identified as damaged or not suitable for cleaning (units have been used for over 10 years), technicians will ask for your preference to see if you still want the cleaning service and inform you of the possible results that might arise. If you opt for continuing the cleaning service, problems mentioned by technicians during checks will not be included in the 3 months free maintenance period. Technicians will only charge you with $150 on-site visit fee if you choose to cease the service.