My parents where one half year in Sunapee N.H. one half in Fort Myers FL.
Because in retirement or even in the years just short of) alot of your income probably comes from investments. Although both states don't have income tax. NH as I am sure you know has a tax on unearned income ie dividends and interest of aprox 5%.
Makes being a Fla Resident a no brainer.
You can get a licence plate holder that says live free or die if it makes you feel at home.