I'm kinda enjoying the heat up here in AK. It's the middle of July, and it's only 55 degrees here, and has been raining all week. Ha! I can see how this would be a concern if I was back in AR, though. While some noise reduction would be nice, I want as much heat coming into the cab as possible this winter. This is one of the few tips I've read on this site that I'll probably ignore. Looks good, though. I applaud your ingenuity.