Still chasing this down. I woke up this morning to about 37 degrees outside and around 62 inside. I have an infrared thermometer and went around checking walls. All walls and floors came out at within a couple degrees of 60 including interior and exterior. The door and windows were between 55 and 60. Doesn't this indicate decent insulation?
Even the airspace in the wall will offer some insulation. Open a wall and look. You are going to remodel anyway which will give you the opportunity to insulate as you go. You can't have too much insulation in my opinion. Don't overthink this remodel. Get yourself a comprehensive plan and stick with it.
Do you want it your way or the right way?
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