[Greenbuilding] moveable insulation

[Alan Abrams]

A bad window will always noticeably have improved comfort with just a piece
> of cardboard but that is not an Rvalue test it is a comfort test.
> Tests of insulating shades that I have seen rarely show a major Rvalue
> improvement but even drapes pass the comfort test as Doug attests too.
>

...which raises a question: is comfort a (partial) function of radiant heat
loss to

1. surfaces of lower temperature--in this case the cardboard, newspaper,
bubble wrap or shade--vs a single pane of glass at near ambient temp.
2. a radiant-transparent/transluscent membrane, with cold surfaces/cold
space beyond
3. or both?

In other words, is comfort completely attributable to measurable thermal
conductance, or is some quotient that is not attributable to assembly
R-values?
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