Quote:
Originally Posted by stefanc
...and don't want to add foam to living space, that would make our small rooms even smaller.
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Personally, I think that the 'reduction of living space' argument is really the weakest argument against re-insulating from the inside. My house is smaller than yours and I have thickened the interior walls by 2" and the internal reduction is essentially imperceptible... but the reduction in fuel costs is really significant.
If you want a better argument for not insulating from the inside, try the argument that tearing the walls out will totally disrupt your family's life and make your wife and you miserable while you are working on it.
Then there is the expense, since the geometry of inside walls is more complex and you'll have to do so much twiddly fitting to make it really good, especially the finish work around windows and doors to account for the extra depth.
Quote:
Originally Posted by stefanc
Right now I'm leaning toward 8.2 HSPF Multi-splits.
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Again, I think you're shooting too low.
The HSPF for the Fujitsu Halcyon 12RLS is 12, why not go for the gold?
But you might want to try a blower door test before you try anything else. Some cities subsidize such a thing, so it's free or cheap.
-AC_Hacker