At a minimum, you need to clean and maintain the air filters for the indoor unit of your heat pump / air conditioner as any build-up of dust or dirt will restrict airflow. This should be conducted every 3 months or as required depending on use. If you are unable to do this yourself, please contact Fujitsu General Assist on 04 568 8761 to arrange a maintenance call. Please ask your installer to give you a demonstration on how to take care of your heat pump / air conditioner.