Dennis is correct, NARI is a great resource.
Locate a contractor that has a good relationship with a structural engineer. Between the two, they should be able to come up with a good solution.
Verify that all window and door seals/weatherstriping is in good shape.
Check to be sure doors and windows are caulked properly (no gaps, cracks or missing).
If you have an attic access, treat it like ... read more