Why should I replace the entire system rather than one component?
It’s actually more cost-effective in the long run to replace the entire system rather than just one part because the air conditioning components are designed to work together as matched systems. Otherwise, if you replace just one component you may not be receiving the rating of the piece of equipment you have just installed. It becomes just a guess on how efficient your system will perform. A complete system ensures that you are getting the SEER (efficiency) that you purchased.