I live in NYS and our house is almost 50 years old. After the original
owners bought the house they had a second story put on the house. The
second story seems very poorly insulated. In the winter I can put my hand
on the upstairs bedroom ceilings (or hallways) and feel cold. Similarly if
I do that in the summer I can feel warmth from the sun. The upstairs
furnace runs constantly in winter and the upstairs central a/c also runs
constantly during the summer.

The main floor also seems poorly insulated and our walk-in closet of the
master bedroom (corner of house) is like an icebox each winter. We need to
leave the closet door open to be able to use it in the mornings (of course
this cools and drafts the bedroom but we have little choice).

Do you think the wall insulation is either old, settled, insufficient,
non-existent, or other?
Should I enlist in a home energy audit and would they be able to recommend
an action I could take? Where do I find reliable, reputable people who do
these audits?

Thanks,
Walter