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Old 12-19-13, 06:11 AM   #36
Helper EcoRenovator
Join Date: May 2013
Location: Central IL
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I would guess spiral wrapping that PVC duct with whatever thickness fiberglass/bluejean/rockwool batting would give you the R values you want.

The PVC provides the air seal so butting it close as possible would suffice.

I like the mini-split idea as a stop gap energy efficiency improvement, and it basically is what I'm doing. It can provide for all your needs most of the year, and then you have the furnace as backup when needed.
I'm not sure it's a homeowner install, although the avg contractor can be just as bad as they generally move the traditional big units. Vacuum the system is not cheap or simple for a DIY'er, and support if problems arise may be non-existent.
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