The Qualifications to Give You Peace of Mind At A1 Chesney Service Experts Heating & Air Conditioning in Calgary, we’ve been assisting the community since 1912 and all of our technicians and equipment installers are licensed, highly qualified and NATE-certified. We encourage you to read about NATE certification and all it entails. It’s a notable 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 587-315-5271 for A1 Chesney Service Experts Heating & Air Conditioning in Calgary. We have all of the finest qualifications to provide expert furnace and AC repair and service. And all of our work is 100% guaranteed for a full year!