The Air Conditioning Contractors of America (ACCA) announced Del-Air Mechanical of Knoxville, Tennessee, as the ACCA 2019 Commercial Contractor of the Year. Each year, ACCA’s Contractor of the Year award is presented to a contracting company that demonstrated an extraordinary commitment to contractor excellence. Finalists are judged on a range of qualities including community involvement, industry involvement, and a commitment to training and certifications.