We have a house with a bedroom over the garage. The house is well insulated. Furnace is a mid efficiency 10 years old , same as the house. The ducting is ill designed. We can remove the basement ceiling and redo some of the ducts but it is still a long run up to that bedroom. I am thinking of repalcing the furnave with a 94% efficiency DC fan motor unit. Would it be possible to install a booster fan in the large duct that feeds that bedroom?

THanks

Moisheh