I'll try to keep this brief, but apologize for the length of this post.
My century home (only about 1800 sqft over 2 stories) has no basement. We have had a new downdraft (heat comes out of the bottom of the furnace) F.A.G furnace/AC installed. To get upstairs the heat/ac runs through ducts in the crawl space under the house, up through the 1st floor with a trunk line, then splits in two to feed 2 bedrooms upstairs. We can not seem to get heat/ac into those rooms without the aid of an in-duct "booster" fan. This "boster fan" is large and very loud (both in the room in which it is located and the 2 bedrooms that are the recipients of the heat). I'm about to renovate the living room (where the trunk and said fan are located) and box the trunk/fan in. Even when I do this, the box is going to be huge and I'm still afraid of noise (right now you can barely have a conversation in the room if that fan is running). My question - is there no way that I can get better flow of air through the ducts without the use of this booster fan? I see MASSIVE houses being built, sometimes more than 3 stories high, and they don't seem to have trouble getting heat from a basement all the way up to a 3rd story without the use of these fans. The reality is I need even more of them in order to bring the flow of air upstairs (and even into my living room) to other rooms more to a normal level. Suggestions? HELP!