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AAON was founded in 1988 when Norman H. Asbjornson set out to create a commercial HVAC company that designed and manufactured semi-custom equipment. Asbjornson purchased the heating and air-conditioning division of John Zink and created a new company called AAON. The name ensured the company would be listed first in the phone directories.
In 2000, AAON began to manufacture equipment in Longview and in 2019, broke ground on a facility expansion as part of a $28-million-dollar investment in the plant. Further expansion in Longview commenced in 2019 with the completion of a 220,000-square foot building, an additional $40 million investment. In 2023, the Longview Economic Development Corp. approved a second $40 million expansion and is scheduled to be completed in 2024.