I've seen recommendations for locations near the Great Lakes. Upper peninsula of MI, for example. Plenty of water. A warming climate should actually make the winters there somewhat less harsh.
Wildfire smoke will be the big question there. It's started to be bad for a week or two a year in Minneapolis, and is only worse the closer you are to the boreal forest.
Depends on how much warming. Some areas of the UP are colder temperature wise, but because it stays below freezing most of the winter the humidity stays low and it doesn't feel so bad. Where as some lower areas in Michigan now regularly break the freezing line in winter and everything is always a sopping mess with cold high humidity and no snow to act as insulation for buildings.