Solar heating technology is not yet mature

However, there are many powerful companies that have pilot projects in this area, such as Linuo (it seems)

The ratio of solar heating collector area to heating space needs to be at least 1/3. That is to say, a 60 cubic meter house requires at least 20 square meters of collector heating area. In addition to heat storage containers and heat exchange devices, the cost is high. , and it cannot be purely solar, it also requires other auxiliary heating.