It is hard to say that many users use their air-conditioners properly. Of course the usage of an air-conditioner doesn’t only include installation. Reading the user’s manual given by the manufacturer completely and carefully is the best start. Although basic working and using rules of an air-conditioner are nearly the same for each product, of course, the manufacturers know the best ways to use for their product. It is important to obey the rules explained in the user’s manual for a long-term usage. After reading user’s manual carefully, you can go on with different issues. We can say that air-conditioners need annual maintenance as we do for our cars or some devices. The most important parts of an air-conditioner are filters. How often should you clean the filters depends on the place where you install your air-conditioner. I mean it depends on quantity of dust and particles in the air. And the period for cleaning the filters is always told in user’s manuals. To clean the filters twice a month is very useful and necessary. You should also clean the internal filters once a month with the help of a wet cloth or vacuum cleaner. During the cleaning, to choose hygienic products is very vital not only for your air-conditioner but also for your health. This helps you to have fresh air and you may get rid of odours in this way. You can find these products in local markets easily. You should wait until the filters dry after you wash them. To clean external parts at least three times a year is enough. And, you should follow the instructions written in user’s manual. The filters of a ceiling-mounted air-conditioner should be cleaned or changed once a year. The electrostatic filters in split and multi type air-conditioners should be changed 3 or four times a year. Periodic cleaning of an air-conditioner is important not only for an air-conditioner but also its benefit. Furthermore, cleaning really decreases your cost bills. You can’t cope with hot weather without an air-conditioner; you can’t have an air-conditioner without maintenance.