Could you imagine making it through the summer with no air-conditioning? In many areas of the country, this could be a nightmare. For those that are older and frail, it could even prove to be fatal. If you have a central air conditioning system, making sure that it is in top shape is well worth the time and the cost, since letting your system fall into disrepair could mean that you will end up needing to buy a brand new unit.
If you can afford it, having regular checkups by a reputable company is a good investment, but besides that, keeping an eye on the air-conditioning unit yourself is only common sense.
The most basic requirement is that filters are replaced regularly. This is a fairly simple process and can be done in a few minutes, and it is essential to the proper operation of your air-conditioning unit.
You also want to check that no branches or debris have fallen into the unit. Before trying to remove anything from inside, make sure that the unit is disconnected from the power, to make sure you are not injured.
During long periods when the unit is not used, it is wise to cover it up to protect it from the elements.