An air-conditioning unit that is functioning well can save you a lot of discomfort in hot and cold weather. Just like a car, these units need to be serviced regularly to get the best bang for your buck and ensure they last as long as they are meant to. Major servicing should only be done by a professional. In between this, you can clean out the filters and make sure there are no grass stems, bushes or any other rubbish growing up around the external part.
Cleaning the filters is not difficult; it is reaching up to them that is the hardest part. Use a safe ladder and always wear shoes that fit well, not house slippers when you get on the ladder.