I am going to be installing a new furnace, but not replacing the existing one just yet. They way it is setup now, the bedrooms are at one end of the ranch house, the kitchen and dining room at the other end. The furnace is currently under the bedrooms, or I shoulod say very close to them. The bedrooms are hot, the kitchen is cold. I plan to install the new funace, centered in the house, which is about 12-15 feet from the existing furnace. My question is, I am keeping the existing one in place for now since the AC works fine and we dont have hot and cold areas during the summer, just in the winter. Is there a way I can dampen the two furnaces so that one doesnt interfere with the other when its idle, or do I even need to worry about it. Eventually when I can better afford it the old one will be ripped out and a new unit installed in the new furnace.
Well the whole idea of moving the furnace over is that we will be eventually remodeling the basement and there is a space that is perfect for the furnace. At the moment the furnace has to go, but we cant afford to install the AC unit just yet, Can I put a damper above the plenum for now? The main reaon I dont want to pull the old unit right now is I would have to rip out 2 walls, jack up the floor to support the main beam, replace 2 of the boards in the beam,(they are all wooden 2x12), just so I can get the room to remove the furnace. I can get to the plenum from the front and one side though.
Well, got it all installed, and found out why the one end of the house never got enough heat. The main trunk, 12 x 24 x 40' was transistioned into the plenum by a 10 x 20 curved transistion. I installed the new furnace directly under the main duct, installed some dampers in the pipes I coud get access to and now the whole house is evenly warmed. Made a sheet metal panel to block the return where the filter goes in the old furnace like you suggested and removed the humidifier. Works great, thanks for the advice. I have one more quetion, but I will look through some other posts first regarding a humidifier.