Yes,Thomas, I work early or late in the summer. I've never used any heat in the winter. Like Bird, I can wait until later in the day and it is usually quite comfortable. Since it's a hobby thing, I just don't go out there if it's too unpleasant.
Condensation used to be a big problem in the winter. The sun would hit the cool metal roof, and condensation would form and drop off like rain. The additional roof layer stopped that, too.
Gene in MS