I changed my logo around a bit from the tall AH. I still kept with the idea of the A and the H making a building but now it's a different kind of building.
Right now, I'm leaning towards the upper right one because it's compact and it stand out the most to me. I also like the bottom right but maybe the text isn't inside the thing. It's still a work in progress but I think it's a lot better than the one before.