We called Indoor Air Quality Solutions, IAQS out last month, and after working with them, I would have to say that they were very professional people! They came into the office, and we showed them around the facility They asked for the blueprints, and then they went to work. When they finished, they sat us all down, and we talked about the situation. They are very knowledgeable people, and they opened our eyes to a lot of things that we had never thought about. They know what they are doing, and we highly recommend Indoor Air Quality Solutions, IAQS to everyone!