I called to have my building balanced as all of the offices were completely different temperatures and we were receiving many complaints. Within a couple of hours a technician was here and working to remedy the problems. He was here for a very short time and now the whole building is a consistant temperature throughout and the complaints have stopped. The cost was higher than I had first expected but after the technician explained the cost of the specialty equipment and the rigorous maintenance is must go through to keep it working properly I was very satisfied with the results. 5 out of 5 on service, explanation, and results. They also sent me a very detailed report showing the airflow each office was receiving and how they had adjusted the ventilation equipment to operate as efficiently as possible so we are now saving around 10% on our electricity bill. Nothing bad to say at all, great experience!