Grime inevitably collects in the evaporator coils and condenser coils with time. Grime inside the evaporator coil lowers airflow and a chance to evaporate warmth, so Test the evaporator coil annually and thoroughly clean it when it wants it. We experienced our two split technique air conditioners serviced and cleaned. https://sites.google.com/view/ductedairconditioningsydmbg/home