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Hi Bobnelms
Ducted AC is only true if both the return side & the supply side is ducted...you are getting return air noise...to eliminate it you have to cap the return grille in your living room & move it to both sides of the ceiling near the walls, like the newer Montana's. Noise travels in a straight line, until you baffle it or turn it. Ductless AC was never designed to travel down roads threaded fittings & screw terminals as such. Not sure on the R410 refrigerant either, during down periods it may chemically separate. Now you are totally confused right !
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