I saw the "Wall o Water" at the local garden store. I thought maybe a homebrew (inexpensive) version of that might be a good idea.
I wonder if dark-colored plastic jugs of water would be better at absorbing and releasing heat.
I also did just scrounge up some free radiant barrier material. It was used as a shipping/packing material - bubble wrap with a silver aluminum finish on the one side. I thought that might make a good "north wall" material.
More things to try experimenting with!
