The Qualifications to Give You Peace of Mind At Roy Inch & Sons Service Experts Heating & Air Conditioning in London, we’ve been helping the community since 1927 and all of our experts 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, experience, 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 226-270-1164 for Roy Inch & Sons Service Experts Heating & Air Conditioning in London. 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!