Using a few large ducts instead of many small ducts to reduce total exposed surface area.

Does it make much of a difference to use fewer large ducts instead of several smaller ones coming from the air handler? IMHO the "trunk/branch" type setup has substantially less losses than a "spider" type duct arrangement because the Trunk/Branch has less surface area exposed to the attic temperatures. Is this true or does it not really make much difference?

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