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Ducting for heat - registers high or low?

3419 Views 11 Replies 3 Participants Last post by  Jim W
I'm beginning to work out the ductwork for a new furnace installation (added 1000 feet still under construction) with no existing ducting.
The house is a long narrow 2 story with a 500 sq ft lower room downstairs. The furnace will be a gas fired up-draft located centrally on the 1st floor. The ducts will run through the attic/trusses but I also need to get some heat downstairs as well.
The downstairs is built from ICF walls and the only way I can have registers at the floor would be to make a false wall. If I put the registers in the cieling it would be much easier but I think that it won't be very efficient (due to heat rise).

Any ideas? Also, has anyone used those online duct engineering services? Apparently you send them a sketch of your floorplan showing rooms and joist direction/spacing and they do a take-off for you.

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high supply and returns are common on commercial installations where the hvac system is often above a lay-in ceiling. As beenthere states, the registers used plus the proximity to the returns is going to make the difference for you.
you need returns in each room except a bathroom and the kitchen. Lack of a return will cause the room to pressurize if the door is closed and will not heat or cool properly due to the lack of the air being able to flow through the room.

You don't put one in the bathroom because you do not want to circulate the stink throughout the house. The same for the kitchen. Well, that is if your cooking stinks.:whistling2: You do not want to circulate the smoke and oils associated with cooking.
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