The problem with residency for retirees is often complicated. The rules vary from state to state, and are sometimes contradictory about where to get a driver's license, where to vote, what taxes are owed where, how medical plans cover expenses and care in a second state.
I try to keep things simple. If I were to spend extended time somewhere else, I'd rent, and keep my footprint in that other area as minimal as possible. I'm upper-poor, so OH tax isn't that bad a burden as a retiree.
If you have multiple places that you have a place to lay your head a night you are more than ‘upper poor’. Most folks IF they even get to retire have one place they call home.... not one for the summer and one for the winter