I asked Christian late in the day for a quote. We have a very special requirement for a boiler and a furnace. There is an option to a boiler and an air handler. Christian was very helpful and gave a lot of detail about what we could expect. He is personable and kind. I would have easily gone with G.T.A I felt that I had used so much time of the other person quoting that I felt obligated. I give G.T.A. 5 stars and I will recommend and use them in the future.