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SteveBell

wrote in
:

I didn't mean that there was actually a stream of cold air (which
there isn't) just the knob itself is freezing cold probably because it
is made of steel. I figured filling the gap with spray foam or
replacing the bezel with a wooden one would solve the problem.

If you disassemble the lockset, you'll find that the metal outside knob
is fastened to the metal inside knob with metal screws. The locking
mechanism also connects to both knobs, just not as solidly.

To stop heat from flowing from the warm side to the cool side, you'll
have to have a "thermal break" between the two sides--some non-metal
material to which both sides attach.

This non-metal thermal break is not available as far as I know, and I
bet it never will be. It would be a weak point in the lock, and you
want a lock to be as strong as possible.

The heat transfer will be small in any case.

If you're interested in saving heating/cooling money, you'll be better
off looking for something else to improve. If you want to avoid
touching a cold doorknob, get somebody's grandmother to knit a doorknob
cozy.

Hint: Don't waste your time saving money on your doorbell. ;-)

--
Steve Bell
New Life Home Improvement
Arlington, TX