Air purifiers are sure high maintenance but not so much. The very first thing they would need the most is the filter change. Different kinds of air purifiers have different needs for their filter changes. They can sometimes last even for years, but at times, they might require to be changed in around 3 months. The companies always give you a guideline on this, but you can opt for the ones, which give you an indicator whenever the filters need to be changed. If you go for the ones with indicator, they can give you an approximate time on the manual when to expect an indicator, and upon receiving one, you can change the filter easily. However, if you are not using any, then you will have to do it manually and forgetting about it will not be an option as it will still keep on consuming the power but will not give you any good response and you will not be able to solve all your such problems easily. When you are buying the air purifier, you can check the approximate time that they might last and keep checking it regularly to see if it is working. Even if the manual has advised changing the filters after a year or so, you can still try and check up on it every month to be sure that you are still receiving the excellent air, which is free of pollutants and all kinds of harmful substances and gases.