Marcus Hiles has one last tip for homebuyers and renters. He suggests that you look for properties that have newer air conditioner units that have a seasonal energy efficiency ratio (SEER) that is 16 or above. The Department of Energy only requires new units to be rated between 13 and 14, but as Hiles points out, the bigger the number the better the savings. When compared to a unit that is 15 years old and rated at 10, the newer units can cut air conditioning costs as much as 60 percent. He equips his properties with new air conditioning units that deliver savings of more than $424,000 every year. He also points out that over five years that will be more than $6 million saved and carbon emissions lowered by 327,000 tons.