The Qualifications to Give You Peace of Mind At Strogen's Service Experts Heating & Air Conditioning in Rochester, we’ve been helping the community since 1977 and all of our experts and equipment installers are licensed, highly qualified and NATE-certified. We encourage you to study NATE certification and all it requires. It’s a distinguished credential that our service folks have earned through learning, 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 603-923-4570 for Strogen's Service Experts Heating & Air Conditioning in Rochester. 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!