In our offices or houses, air conditioning contributes greatly to our comfort by cooling down or heating up the surrounding atmosphere.
In order to keep the air healthy, we advise you to regularly clean or even change the filters, both inside and out. If your appliance isn't working properly, you may want to check the vent duct as it could have a hole in it.
It's not uncommon to have to replace one of the parts in your air conditioning unit, for example if it isn't doing a very good job cooling, then you need to check the evaporator or condenser. The parts that need changing most frequently are often the filters or even the remote control, either because it is faulty or because you have lost it.