The Qualifications to Give You Peace of Mind At D & K Heating Service Experts Heating & Air Conditioning in Belleville, we’ve been assisting the community since 1985 and all of our technicians and equipment installers are licensed, highly qualified and NATE-certified. We encourage you to learn about NATE certification and all it involves. It’s a distinguished credential that our service folks have earned through study, expertise, extensive training and testing. So if you should need HVAC service or repair, don’t just call some guy with a few wrenches and a truck. Call 613-707-2421 for D & K Heating Service Experts Heating & Air Conditioning in Belleville. We have all of the top qualifications to provide expert furnace and AC repair and service. And all of our work is 100% guaranteed for a full year!