Thanks for some input. There is a cheap fan control that closes a set of contacts for the fan on temp. rise or fall. I see where your going with this, let the temp. rise inside the box, then let the fan blow the warmer air out. That's good, great addition.
The guy in the pick used vacuum hose. That's too small, I may use eight inch insulated flex duct with a six inch supply, along with some sort of diffuser to throw the air in certain directions.
Maybe separate the workshop from the garage to make the climate controlled space smaller. As I can remember the garage is big enough to fit two of my TJ's bumper to bumper.
We'll see how it turns out. Anymore thoughts would be appreciated, the t-stat was a good one. Keep it coming. On my free time this summer, I will have alot of left over lumber. So, I will start building as soon as I can.
<img src="/forums/images/graemlins/cheers.gif" alt="" />