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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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There is not a lot of moisture supported in the air even at 100% rel humidity (at 38F.)
If you have a leak somewhere (ingress into the heated space) then you could have high in-cabin humidity, and a tough time defrosting w/o a drier component to the HVAC.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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