The simple answer to this question: The efficiency ratings found on air conditioning systems indicate how well the unit converts its electrical power into cooling output. The higher the rating number, the less energy goes to waste—and, usually, the less it costs to run.
You may have figured out this much on your own. What you really want to know is what the specific efficiency ratings mean for air conditioners: EER and SEER. This is also basic to understand without bringing in the hard math. However, as we’ll explain later, you’ll still require the assistance of an air conditioning service company in Raleigh, NC when the time comes to pick a new unit to install. An efficient air conditioning system that’s not the right fit for a home, or which was installed poorly, will end up wasting energy anyway.