Find Trion Indoor Air Quality products online at HVAC Depot. Since 1947, Trion has provided quality products for the commercial, industrial, and residential markets, which are engineered specifically to provide a clean, safe, and comfortable indoor air environment. Today, Trion IAQ is a brand of Johnson Controls Inc. 's Building Technologies & Solutions (BT&S) business segment. Johnson Controls Inc. is a global diversified technology and multi-industrial leader serving a wide range of customers in more than 150 countries.