A-1 Certified Service, Inc. is a full-service insulation, geothermal, water heater, and HVAC company serving the Knoxville area. When it comes to dispatching an HVAC technician for your furnace, AC, heat pump, or mini-split repair or replacement, we only send the best. You can also rest easy with us if you have a water heater, sump pump, well pump, or fireplace problem. We proudly service Knoxville, Oak Ridge, Clinton, Powell, Louisville, Heiskell, Lenoir City, Oliver Springs, Alcoa, Friendsville, Norris, Briceville, Rockford, Rocky Top, Coalfield, Maryville, Andersonville, Petros, Corryton, Greenback, Loudon, Harriman, Jacksboro, Caryville, Kingston, Seymour, Mascot, Walland, Strawberry Plains, and the surrounding area. And, at A-1 Certified Service, Inc., know we always put you first. So, when you ask Google for a “good heating or AC company near me” you know you’ve come to the right place. To get a quote on your furnace or repair, call (865) 691-5088. A-1 Certified Service, Inc. services all furnace, AC, and water heater brands including Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Daikin, Mitsubishi, Fujitsu, Frigidaire, Gibson, Goodman, Lochinvar, AO Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, White Rodgers, Dynamic, and Skuttle.