When I was growing hydro, I almost always grew greens during the winter months. They are very easy to grow hydro and don't require much light. I do think that we will continue to see more and more hydro--resources can just be used so much more efficiently.
Yeah i know. It was just cheaper and easier for me to grow in soil.
I use to use frozen water bottles in my DWCs to help with solution temps,,but it was a pain in the butt.