"Bob" wrote in message
news
If you're adding more than one or two branch ducts, be sure to do a Manual
D, because you'll probably need to increase the size of your supply and
return trunk ducts.

That is why I will be hiring (and probably paying dearly for) expert
assistance. The bids I get will specify that I want a whole-house study, not
just a light-bulb switchout. I know just enough to be dangerous, and this
will probably be a 4-5 K job minimum, so I won't cry over a few hundred for
the guy to do a site survey.

aem sends...