It’s late April and the heat is up to 90 degrees outside, you casually turn on your air conditioning, but something is wrong, it’s not working! The cheapest way to go is to fix it yourself, however, can you find the problem? Even if you do not choose to fix it yourself, you should have an idea on the approximate location of the problem. The most common domestic system is a Split System andPackage Unit. A split system has an indoor unit and an outside condensing unit. A package unit features everything in one unit.