Hi. Air conditioner filters should be checked and changed about every 1-3 months. In Dubai, more frequent replacement may be required due to the dusty atmosphere. It is recommended to perform preventive maintenance on your air conditioner at least once a year. This includes cleaning and checking all system components, checking for refrigerant leaks, checking efficiency, etc. On the website of HandyMan One handymanone.ae/ac-service you can order the services you are interested in