Each Trane product is put through 16 weeks of extreme testing in all elements. If a product doesn’t pass our tests, it doesn’t go into production. Trane was announced as a 5-star Smart Thermostat Brand in the 2021 America’s Most Trusted Study. In addition, Trane CleanEffects® was determined to be the most effective whole-house air filtration system by a Harvard-led independent research project on the air cleaning performance of multiple in-duct and portable devices.