As long as you have a simple system I would recommend this company. Nice employees and they really do show up on time. That problem we had is that we have a fairly sophisticated integrated system with a Trane Whole House Air Filtration System that the One Hour technicians had no idea how to service. What I resented and the reason I opted out of their services is that on, at least three occasions, they attempted to service the system, made a mess of it and then slinked away hoping we would not notice. We will never trust them in my house again.