I really appreciate your writing about you greenhouse, Chip. It is a tour de force of deep winter greenhouses, given your elevation and latitude, and a very thoughtful design using affordable flat panel collectors, in floor heat and water storage to maximize solar and minimize power use. Do you have some data on your supplemental AC heating cost and the SF of the greenhouse?
Are you using supplemental lighting as well? The number of cloudy days with cold here is often a problem in late Dec through early Feb; vegetables just go dormant. Takes them 4-5 days or so to get going again during a sunny/warmer stretch. I'm wondering if your approach with warmer soil temps might help combat that dormancy.
I hope others will forgive my enthusiasm for more technical greenhouses. Those producing with a more keep it simple approach also have my respect, but as a retired engineer I really enjoy technical challenges and seeing how exceptional folks like Ryan and Chip have tackled them.
