A-1 Certified Service, Inc., is a Tennessee (TN) Heating, Cooling, Air Conditioning, Geothermal Heat Pump, Ductless Mini-Split, Fireplace, Water Heater, Insulation, Sump Pump, Well Pump, and Furnace repair, service, replacement and maintenance Company located in the Knoxville area. A-1 Certified Service, Inc. employs only the best technician for air conditioner, furnace, ductless ac repair as well as all air conditioner replacement, furnace replacement, and water heater replacement. We offer 24 hour emergency service to Knoxville TN, Oak Ridge TN, Clinton TN, Powell TN, Louisville TN, Heiskell TN, Lenoir City TN, Oliver Springs TN, Alcoa TN, Friendsville TN, Norris TN, Briceville TN, Rockford TN, Rocky Top TN, Coalfield TN, Maryville TN, Andersonville TN, Petros TN, Corryton TN, Greenback TN, Loudon TN, Harriman TN, Jacksboro TN, Caryville TN, Kingston TN, Seymour TN, Mascot TN, Walland TN, Strawberry Plains TN, and the surrounding area. So when you ask to find "A good heating, air conditioning, or plumbing repair or service company near me", you've come to the right place. To set-up a repair service estimate or replacement estimate, call (865) 691-5088. A-1 Certified Service, Inc. services all furnace, AC, humidifier, filter, thermostat and water heater brands including Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Daikin, Mitsubishi, Fujitsu, Frigidaire, Gibson, Goodman, Lochinvar, A O Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, White Rodgers, Dynamic, and Skuttle.