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There may be longer icicles below the unheated sectons because the melt water that runs of is only just above freezing so more quickly refreezes when it is exposed to the air. Melt water from sections of the roof above heated rooms, especially if insulation is poor will be warmer and has more chance to run all the way down and drip off the icicle to the ground before it cools down enought o freeze.
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