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.