I'm pretty sure I'm close to the right answer, let me know what you think!

Article regarding heat storage for sand, clay, concrete, and water:

https://www.researchgate.net/publicat...

Tour of Patrick's greenhouse with sand battery:    • The Most Efficient Greenhouse on Eart...  ]

Like, Comment, Subscribe and follow @ArkopiaYouTube We are experts in preparedness, homesteading, sustainability, high efficient construction, passive solar technology, deep winter greenhouses, freeze drying & other food preservation, economics, and small sustainable food production.

We are the inventors of the Best Selling Smoothie on amazon: Arkopia Freeze Dried Smoothies. We are also a small, multifaceted farm located in Saskatchewan, Canada where we are striving to provide our hyper-local community with food (and flowers), direct to customers off our farm.

#sandbattery #greenhouse #energyefficiency #thermal #homestead

Website: https://arkopia.ca/
Smoothies at Full Wholesale: https://arkopia.ca/shop/membership/

12 packs and singles on AMAZON Canada & USA

AMAZON USA: https://www.amazon.com/stores/Arkopia...

AMAZON CANADA: https://www.amazon.ca/stores/node/372...