I like the idea of entry #7 not sure about the Font or how the gradient will look as I will be using the logo for a Van Wrap and print ads. I like how the flames represent heating and cooling. My main business is plumbing so I would like something to represent water or plumbing.
Entry #3, I like the idea of leaves in the recycle symbol. As you can see from my current logo I have something similar. Not sure about incorporating a home shape or something to represent plumbing heating and cooling more. I am working on a vinyl wrap design that will have photos and some 3d effects as I want people to really notice the van and also associate my logo with plumbing, heating and cooling. Thanks for the ideas, keep them coming.