For example, the SEER rating of 20-year-old air conditioning systems is likely to be between 10 and 12, while a newer unit purchased this year would have an average SEER rating of 15 or higher. In other words, the SEER rating indicates the maximum efficiency you can achieve with your HVAC system. The higher the SEER rating, the more efficient your system should be. The current minimum standard is 13 SEER, but you'll see systems that range from 13 to 21 SEER.
Most people are trying to decide between a SEER 14 and a SEER 16. So how different are these ratings?.
