The last piece of advice Marcus Hiles offers is that renters and buyers locate properties that have central air conditioners with a seasonal energy efficiency ratio, or SEER, of 16 or higher. The Department of Energy only requires new air conditioners to have a 13 to 14, but the higher the number, the better. Hiles notes that compared to a unit with a SEER of 10, you can see a drop of nearly 60 percent in your air conditioning bill. His company Western Rim Properties provides more than $400,000 in energy savings every year thanks to energy efficient air conditioners, pointing out that in five years they will have collectively saved $6 million. Not only that, but over the course of the next ten years they will lessen carbon emissions by more than 325,000 tons.