I have 2 40gallon trash cans of water in there as thermal mass. Just not enough when it’s 2°F outside
Those are rookie numbers 😉😂
https://northcentral.sare.org/news/high-efficiency-year-round-tropical-greenhouse-in-south-dakota/
https://projects.sare.org/wp-content/uploads/Intro-to-Northern-Year-Round-Passive-Greenhouses-MG-SDSPA-Part-1.pdf
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Ah interesting. It’s only a 6ftx8ft space. There’s not much more room for another barrel.