In this video we continue the process of building the climate battery for our new passive solar greenhouse. Climate batteries also called GAHTS and subterranean heating and cooling systems store energy in the earth when there is a surplus of heat in the greenhouse for later use. We spent most of the summer performing thermodynamic analysis on our greenhouse to determine if they even worked and to our amazement they do. In fact our analysis showed that they have the ability to store energy seasonally which was better than I was expecting. Our model anticipates that we should be able to keep our greenhouse above zero until January 15th of most years without any fossil fuels to keep it heated. This should provide us with 3 seasons of robust food production with minimal costs. See the videos for all 3 days of climate battery construction: Day 1 - https://www.youtube.com/watch?v=8vPzoU3MfeI Day 2 - You are here! Day 3 - https://www.youtube.com/watch?v=5g92Smw2Hic If you're ready to build a life changing greenhouse, Register for the course at: https://vergepermaculture.ca/passive-solar-greenhouse-design-course/?utm_source=youtube&utm_medium=organic&utm_campaign=psgh_course&utm_content=psgh_tour_8m Links to topics in this video: About Rob Avis and Verge Permaculture: In less than 10 years, Rob & Michelle Avis left Calgary’s oil fields and retooled his engineering career to help clients and students design integrated systems for shelter, energy, water, waste and food, all while supporting local economy and regenerating the land. He’s now leading the next wave of permaculture education, teaching career-changing professionals to become eco-entrepreneurs with successful regenerative businesses. Learn more and connect with Rob & Michelle at https://vergepermaculture.ca/ FREE RESOURCES: As a special gift when you subscribe to our newsletter is that we’ll send you the link to download our drop-dead-gorgeous Blog Book: 50 breathtaking magazine-style pages of our most popular blog posts and articles over the past five years, from permaculture ABCs to property-buying, home design, eco-investing, and community retrofitting. Sign-up: http://bit.ly/2Dqjg5G Why should you reserve a place in your bulging in-box for Verge’s newsletters? One reason: because we challenge the headlines and cultural paradigms with a whole different kind of alternative fact: Permaculture-inspired businesses can succeed – and restore the planet. And we’ll show you how to do it.