[AC_Hacker]

Originally Posted by S-F

I see that the biggest lack in energy efficient knowledge is in the field of tightening up old houses.

S-F,

Since you're contemplating a major insulation overhaul (Deep Energy Retrofit), I came across some really good sites that address just such a thing:

Deep Energy Reduction Retrofit with Passive House Tools

Remodel Project: Deep Energy Retrofit

Deep Energy Retrofit of a Sears Roebuck House

This is a Swiss outfit that specializes in air-tight layer construction. There are also some Youtube videos that could be helpful.

-AC_Hacker