 TULSA, Okla., Aug. 06, 2021 GLOBE NEWSWIRE -- AAON, Inc. NASDAQ: AAON, a leading manufacturer of heating and cooling products, announced that its RZ Series Rooftop Unit has been selected 2021 Commercial Comfort Product of the Year in the Rooftop Units category, by a panel of independent engineers selected by the editorial staff of Engineered Systems magazine. 