Having an air conditioner is not the end of your struggle against heat, but actually the beginning. Once you install the air conditioner, you need to make sure that the air conditioner is properly maintained and used, so that its performance do not get eroded over time.
However, with all things mechanical, its performance would see a difference in a matter of a few months and years, and this is primarily due to the filters. You would have to check the filters every few months, because all the dust, debris and non-visual particles in air actually gets stuck in the filters of the air conditioner to give you pure and fresh air.
Aircon Services would help you keep your filters clean, and if necessary, they would also change it. There is also a filter in many air conditioners these days that helps in adding purity to the air, and Aircon services would even check that to make sure that everything in your air conditioner is in order. This would help your air conditioner to perform well without getting stuck or damaged in a short span of time, which might be the case when your air conditioner works overtime.