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Are there access controls on this door such as a badge/RFID reader? I've seen electric strikes on access controlled doors stay pretty warm.
This is what I thought of too. I worked in a building with a warm door handle. Its latch was open during the day, but locked after hours. I assumed the electro-mechanical mechanism generated heat keeping it unlocked.
That would be an easy thing to check. Feel the area around the handle, and the wall near the latch. Is it noticeably warmer than parts of the door/wall further away?