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Except on the hinge side, it is easy to add insulation all around the door seal. Fuzzy mating surfaces may be optimum, but hard to clean. Hard-coated foam parts can be progressively glued in place to give virtually zero air space where the insulation parts. You can also use door weatherstripping material, and a mechanical door latch. Along the hinge edge, you can extend the hinges, or use flexible insulation.
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