The concept is what we are looking for, however I need something to lean more toward "air flowing - hot and cold" and some how incorporate that into the "green" nature of the business we are in. We want people to look at the logo (as if it had no writing) and be able to know what we are about. Does that make sense? i confuse myself a lot too!
#5 has great potential as well. Maybe round it off more to represent the earth, but keep the colors the same. They look like water drops to me. (#5,6,7) - Keep those is you archive, as I think this would be a great plumbing logo!