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RE: Grow ALL YEAR ROUND With An UNDERGROUND GREENHOUSE
The walipini is awesome. We're more worried about heat here, but it'll work for that too, since it'll insulate in the summer as well, and use the ground temp to keep it moderate. It can be complemented by the GAHN system too, which really makes it even more stable.
Heat sinks such as water barrels can really moderate temp. Our old school hoophouse would heat up fast and need vented shortly after sunrise. Whereas our Walipini needs time to warm up. All the heat retention is leaked out overnight and becomes cold, so reversing it takes time.