Daman.... I built option 'A', the one that uses the PVC stuff. I think it works pretty good, considering of where I have it set up. It is on the south side of the house in direct sunlight and though the temp may be higher than my other 3 Temp. locations, when I check it in the middle of the day, I feel 'cool' air coming out of the top. It is mounted over one of the flower beds, that may be helping with the 'cool' air. And, it was pretty easy to put together. If you look in that thread, you will see what I did. Similar, but a little different than Brian's build, and it only cost me (without the fan or solar panel) about $30 bucks. I'm happy.......Jack