[Cal-to-NH]

It's not very clear what exactly your question is, but I think (maybe errantly?) that you're asking how to keep your insurance coverage and still live in two different locations within the United States seasonally? This is not that hard. If you insure yourself with any national carrier like Aetna, Cigna, Blue Cross or Blue Shield, etc.... any member Doctor or Facility nationwide will cover you. For example, I currently live in San Diego but my College Student kid goes to Boston University and although I have blue Shield of California as my healthcare insurance there is a very easy single-click function on the web site to search all carriers in the "Blue network" by zip code. She can easily find urgent care, hospitals, an many doctors that will take the insurance. This would be the best way to go. I would guess if you go with a regional carrier like Harvard/Pilgrim or something like that it would be far more difficult to arrange the same kind of secure healthcare services if you're spending months away from your NH home and you require any type of routine healthcare services.

Again, maybe I'm not answering the question, but it's not easy to understand the ASK in this thread...