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Old 07-08-14, 01:35 AM   #6
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My grandma's house has 2 wooden doors on one doorframe. I once checked the surface temperatures during very cold weather to see how they insulate, but I can't find the data now. I do know that on summer mornings when the (east-facing) door is in full sunlight, the inside surface of the exterior door gets quite warm, but the interior door is still at room temperature.

Originally Posted by NeilBlanchard View Post
I don't know about exterior door frames, but I know that arrangement is used in hotels as the connector door between rooms.
That may be acoustic insulation. Also,each door would have its own lock and passage would be possible if both doors are unlocked.
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