Awesome! That is excisting. Just FYI .. if you don't already know this... I don't know the exact percentage but water retains much more heat / coolness than rock does.. I think maybe twice as much? So it's usually a better option than rock. Like for instance if there is already a rock or dirt south wall in place it makes sense to build on to it, but if you are starting from scratch, maybe consider the idea of tanks or just filling 55 gallon drums and painting them black for an end wall or something similar... Just a suggestion of course... there are so many different opinions and ways to do things especially with farming and maybe a gabion end wall makes the most sense for you and I'm sure it will also work great. :) Anyway thanks for the comment and I'm glad you enjoyed the post :)

Oh one other thing... In the fall this year, I'm going to hook in an on demand hot water heater that runs off of a propane tank. This is replacing the janky 'Mr. Buddy' heater I run. That way, the heat goes straight to the water and is retained for even more efficiency. When I was running the Mr. Buddy I would place it as close to the large tank as possible to achieve this same effect, but using an on demand hot water heater is going to be alot more efficient. I may also add worm bins in the greenhouse. Hoping to see more of a decrease in heating costs and eventually I'd like to break free from the propane and be fully off grid.