When we were snowbirds, we debated getting a humidistat. Our builder told us to set the a/c at 82 and don't worry. He said he's had new houses sit empty for as much as a year and never had a problem. So that's what we did. There were plenty of other things to spend $400 on in a new house. The electric bills were minimal in the summer, and the house was fine. When we would come back in the early fall, it didn't even feel overly warm in the house. They're really well insulated.
Now that we're frogs, when we go away in the winter we do the same thing we used to do up north--set the heat to come on at 55. But I don't think that's necessary--that's just old habit from years of leaving in the winter.
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