That’s the percentage of thermostat sales that are either smart or Wi-Fi thermostats at Samm’s Heating and Air Conditioning in Plano, Texas, according to owner, Paul Sammataro. Sammataro’s sales fit into a growing trend. According to a recent study by Parks Associates, 13 percent of U.S. broadband households owned a smart thermostat by the end of 2017. And while that’s still under a quarter of eligible homes, that number has nearly tripled from just three years prior, influenced by factors like the ubiquity of the smartphone and the rise of in-home AI.