Quoted from IdahoRealtor:Good point. Maybe humidity was the culprit for the guy who experienced planking with pins in his 55 degree shed. Makes sense since he lives in Gig Harbor, WA.
I'd prefer not to keep my new garage at 60+ degrees through the winter if I don't have to. The Boise area is very dry.
I keep my cabin at 55 degrees all winter when I'm not there. I have not noticed any issues with the pins I have there, cabin is in the eastern side of WA which has weather similar to Boise area.
I'd go with the mini-split as well, Boise can be very hot in the summer so the added ability to cool would be nice.