we have been using Opie's One Hour Heating and Air Conditioning for over ten years now, ever since they installed our furnace and air conditioning unit. Last year when they were doing their maintenance work, the technician advised us that a switch on the A/C unit was very weak and might only last one more season. This year, the tech thought it would be best to replace it now, so it wouldn't go out on us during the summer. He explained everything he was doing as he was working, so he made sure we knew what he was doing. I was very satisfied with that. He was a good worker, and I would give him the highest rating. He was professional, respectful, and courteous. We will continue using their services.