Central air conditioners are rated in terms of Seasonal Energy Efficiency or SEER. The higher is the SEER rating more is the efficiency of the central air conditioners. As far as the types of central air conditioners are concerned, there is a whole range of different varieties but for residential purposes there are mainly two types, they are the split system air conditioning and the packaged air conditioning units.
However, in order to ensure that the central air system functions well, it is important to take good care of it. For instance, cleaning the filters at regular intervals is of utmost importance. This is because when dirt and debris gets clogged into the filters, the system has to work harder to emit the desired amount of cold air. As a result, the wear and tear on the machine will be higher and the chances of it malfunctioning will increase. Last but not the least, in case of central air conditioners getting in touch with an expert HVAC technician is a much recommended thing to do.