AAON

Aaon, Inc.

A maker of heating, ventilation, and air-conditioning equipment for commercial buildings, AAON builds semi-custom rooftop units used in schools, offices, hospitals, and retail stores, plus cooling gear for data centers through its BASX brand. It was founded in 1988 when Norman Asbjornson bought the heating-and-air division of the John Zink Company in Tulsa, Oklahoma. The name "AAON" was picked to put the firm first in phone directories and is pronounced "aye-on."