The U.S. Department of Energy revised its guidelines in early 2015, demanding that new residential HVAC systems installed throughout the Southeastern U.S. increase the minimum from 13 to 14 SEER (the Seasonal Energy Efficiency Ration that defines an air conditioner’s overall efficiency). Marcus Hiles’ Fort Worth company went two steps further in response to these changes, using only central AC units operating at 16 SEER. The results were immediately felt by residents, saving an average of 20 percent annually when compared to an apartment built five years earlier, and up to 50 percent when measured against a 10-year-old unit. The U.S. Energy Information Administration’s Residential Energy Consumption Survey concluded that Texas households spend an average of $1,800 per year on electricity, but Hiles notes that in spite these numbers, residents from just one of his developments save more than a combined $53,000 annually. Hiles’ cost-effective projections estimate that over the course of five years, Western Rim tenants will collectively save more than six million dollars in total, an impressive number. 16 SEER ACs also help the environment as they produce lower CO2 emissions, 744 tons annually per Western Rim neighborhood. This is the equivalent of removing nearly 1,000 cars from the road each year.