I have never grown King of the North, but I do have peppers overwinter.
A couple of pepper species (Capsicum baccatum and C. chinense) are very late, and
barely produce anything before a killing frost in my garden. I grow them in big
pots which I put outside in summer and bring inside before frost. I have several
plants of Cambuci, which are about three years old. They produce small peppers
all winter at a window in the house.
I also potted a lot of C annuum that had been producing fruit in the garden
and put them in a greenhouse which stays about the same temperature
as outside, except it doesn't go below freezing. So it is about 5 C (40 F)
all winter. They continued to ripen their peppers during the winter, then
a lot of them died. However, some are still alive, and are now putting out
flowers and new leaves.
I don't know whether these are particularly suited to overwintering, as
this is the first year I tried them, but these are the survivors:
Anaheim, Chinese Giant Sweet, Conquistador, Dedo de Moca, Early Calwonder,
Gourmet, Jupiter, Pizza, Quadrato d'Asti
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