It might save you a little heating and cooling cost, but cost you more
in roof replacement.
The best thing you can do is to make sure the unheated area is
_properly_ ventilated summer and winter, and you have plenty of insulation
in the floor area, at least up to current code for your area.
From all I have read, there are two areas where you get the most bang for
First and cheapest is to install (or have roofer install) ridge vents.
Along with this, you need plenty of ventilation under the eve so air can
enter and then exit through the ridge vent - thereby cooling the attic.
Second is a radiant barrier on the underside of the roof (attic ceiling).
I think this is rather expensive to install on old construction, but is
highly recommended to use on new construction.
I'm no authority on this sort of thing, but this is what I have read from
several different sources.
In many areas, this would not be a good idea. A radiant barrier on the
floor would be ok. Under the roof it would cause the roof to heat up more
and reduce the life of the roof. Radiant barriers have the added problem
that they tend to collect dust and reduce their efficiency quickly.
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