Steve wrote:

He still has a 20+ year old furnace.... doesn't matter where he lives.
.. and short cycling still indicates a grossly oversized furnace no
matter where you live.

Why are you such a trollish Klown?

Or are you naturally stupid when it comes to furnaces and thermostats?

Any boob knows that it's the thermostat that controls the cycling of the
furnace.

You can make ANY furnace short-cycle given a tight temperature span.