MN Renovator
Agree with ALL your points, but need to mention that I am a hired consult on this (hired by the HVAC contractor). As I said, "I hate flex duct"!
That said, I did increase the x sectional area by 15% by using 12 inch diameter flex duct, but exactly as you say, now there is increased surface area for heat loss. We have to use the crawl space (maybe 20" of space) and it is nasty . . .
Now I am leaning towards the PVC ductwork . . . .
To all those that think contractors "rip off" consumers, here I am putting in FAR more time than I am paid, but trying to help out a homeowner. Not trying to be a saint, but I also know quite a few contractors that do the same.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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