Let me share some backstory from my time in the studio yesterday. My studio is a tiny house, outbuilding that my husband built for me several years ago.
It is not on a cement foundation and is not overly insulated. When we built it, we had no idea that I would evolve so much in my jewelry making career.
That said, the building gets cold. I have a space heater in there that I leave on, with a minimum temperature setting around 55 degrees.