Finally nice weather and we could see neighbors outside.
I approach the noisy furnace owner and turn out I underestimated the weight of his dog at only 120lb.
IT IS 136 lb.
I ask him about the rig and turns he is experienced RVer and owns the rig for few months.
He is aware about mud dabs and such, but his answer was "this is new furnace and it always was loud"
Good we moved 3 sites away and now can hear darn thing from distance and other rig coverage.
I think good advice for whoever is buying new RV - start the furnace and WH before paying.