I was wondering if anyone could tell me if I did this correct. I have just finished my load cal exam and keep wondering if I did it right. The house was about 6000 Sq ft with an uncondition basement, 9 ft ceilings, R-30 ins in the attic, and R-13 in the walls with a brick facing. House had tight construction and 2 tight fireplaces. I placed the furnace in the middle of the house and ran the ducts up through the walls with registers out the ceiling. My question is that would I have been better to have went with a multi-zone design, or the way I did it. Please give you input. Thanks