My family and i recently moved into a new home. It consists of 2 ac/heating units. One for the basement and 1st floor(propane heat and ac), and one for the 2nd floor (heat pump). My problem is with the main unit. The return air duct is situated right between our kitchen and family room and the unit is right below in the basement. Since it is not used for the whole house, the return air pressure is extremely strong, but also extremely noisy. You have to speak up or turn the TV way up to hear. Is there any way to quiet the flow of air? Any help would be greatly appreciated.