The Qualifications to Give You Peace of Mind At Golden Seal Service Experts Heating & Air Conditioning in Saint Charles, we’ve been helping the community since 1985 and all of our technicians and equipment installers are licensed, highly qualified and NATE-certified. We encourage you to study NATE certification and all it requires. It’s a notable credential that our service folks have earned through learning, 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 630-246-2698 for Golden Seal Service Experts Heating & Air Conditioning in Saint Charles. We have all of the best qualifications to provide expert furnace and AC repair and service. And all of our work is 100% guaranteed for a full year!