Rooftop industrial air cooler prices vary wildly, from a few hundred dollars for smaller, basic units (like Hessaire at ~$500-$700) to several thousand for larger commercial models (e.g., ~$4,000+ for big systems, $4,200+ for Big Ass Fans units). Expect costs to rise with CFM (airflow), features (down-draft, side-draft), brand (Champion, MasterCool, Portacool), and whether installation, motor, or wet sections are included, with Chinese manufacturers on Alibaba offering very cheap units ($300-$1000) but often with high minimum orders.