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by vanderZwan 1469 days ago
AFAIK the physics of heat pumps is considered to have been fully figured out for ages and all that's left is the engineering. Maybe it wasn't considered a "sexy" enough topic to nerd out over and hyper-optimize?

Edit: it might also be an issue of diminishing returns of better efficiency compared to how difficult it is to produce and maintain a better unit. Thermodynamics can be a pain like that.