[turbo6bar]

Good and bad, like he says.

I browse hvac-talk forums occasionally. If a homeowner comes online and asks stupid questions, they are treated poorly. If a homeowner does some legwork and asks intelligent questions, they can get good advice.

77911S, get one of the load calc programs like hvac-calc. You can determine heat loss and gain and then size your hvac system properly. Then size your ductwork based on the flowrate. Add manual dampers at each branch, so you can balance the flow among the rooms. It is not brainy work, but it does eat man-hours, particulary if you do a good job sealing the joints.