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RE: Building a cheap and energy-efficient smarter house by understanding basic science
Only because I chose to build the house over a long time. I would contract teams of workers for a specific task (like excavating and digging a borehole or installing the rebar and pouring the concrete for the underground technical and treatment room).
They only needed a limited amount of materials for each task and the next task would happen after a few months. I would save money in that time and insert another coin :D