Lin0 wrote:
Cool take a look at these temps and see if the current insulation is
doing its job

Right now 1:31pm Flat Rock michigan = 84°F
My A/C is not on, and there are no fans bringing in outside air
79°F on main floor
104°F in attic

I'll bet you would see a noticeable change if you were to add more
attic ventilation

All outside walls ranging between 76° and 81°F

How did you measure that? Surface temperature measurement is difficult
and not necessarily very accurate owing to whatever the surface
actually is.

But, what's more important is the difference between the inner and
outer temperatures which is nearly nothing at that point in time --
that indicates more likely that it simply hasn't warmed up that much
yet but _could_ also be saying there essentially isn't any thermal
barrier-- impossible to tell the difference from only one data point
even assuming the values are correct.

The only thing that makes think you would likely have at least some is
that you're in a northern cold-weather climate where I would _presume_
they routinely did insulate. But, not knowing anything about the
particular house, that's still simply supposition--a lot of tract
houses were built around that time in a real hurry and energy saving at
the time was _way_ down on the list of priorities.