Current weather is defeating the attic as a paint curing oven. It's way short of pro but this is working:

Flickr

Flickr

45F, breezy & sunny: With the heating pad set on high, the inside temp is ranging between 110 & 105 in the late afternoon. If I'd gotten it set up earlier and hadn't been chicken and set the pad on low while I ducked out for a long lunch it would have probably reached 120. Any other time of year it will get a lot hotter and might require venting the lid.

Crude but simple and helpful.