My door lock keeps freezing to the point I can’t open it, any idea why this would happen?

AJ Published: Nov. 13, 2016, 1:15 p.m.Last updated: Nov. 30, 2019, 1:08 p.m.

I have a newly built home (3 years) that is extremely well-insulated and airtight house that had a blower door with results near 1 ACH. I am thrilled with it in every way except that on the coldest days and nights my door lock freezes and I can’t get in and out of the house. My contractor says he followed every procedure properly and that there is nothing I can do. Any ideas?

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