We have a 2 story house. The furnace is two stories down directly below out master BR. We have always has issues with hearing the furnace through the return air ductwork in our bedroom. Recently had some ductwork modified to better get heat up to our boys rooms. The HVAC is working much better, but the noise through the return air duct in the master is worse. Is there anything that we can do about this other than go back and discuss it with our contractor? I would like to be armed with some ideas before I make that call. Please help!