A-1 Certified Service, Inc. is a trusted HVAC service provider based in Knoxville, TN, committed to delivering top-quality heating, cooling, and air quality solutions. Specializing in comprehensive HVAC services, including system installation, repair, and maintenance, we also offers expert duct cleaning and insulation services to ensure energy efficiency and indoor comfort. With a focus on reliability and customer satisfaction, we serve clients throughout Knoxville, providing personalized solutions to meet their specific heating, cooling, and air quality needs.