I have an approximately 38 year old upright freezer. It is working
perfectly. I know door gasket is not as good at it could be, however,
it seems to close pretty tight. It can be real hard to open a 2nd time
after looking for something. But I know there are a lot of square feet
which are acted upon by a very small vacuum. Also, if the unit is not
running, like after a defrost, the magnets in the door gasket are pretty
weak. Anyway, to the question. In your opinions, would it be
advantageous to replace it for a new more efficient unit? How long do
you think it would take it to pay off? BTW, this freezer has survived
being powered off for 4 months and moved 700 miles, approximately 3
years ago. It is a little noisy, but it's been that way for 38 year,
except now it is in a place were I can hear it more.