Our furnace is a HQCO Model # Nugg100H01.It was put in with an outside Heil Condenser. After AC people worked on it last year it started being very very noisy, since it is about 17 years old we think we should replace it. Will a new one be as quiet or quieter than ours was? Quiet is pretty important. What brand is a reliable, medium priced unit? This old one has been excellent.