What you are talking about is a geothermal heat pump with horizontal buried pipes. It's done well in China. Generally, 2 m is not enough. It needs to be two meters below the permafrost to be sure.
< p>Beijing-Tianjin area The layer of frozen soil is generally 1 m, so I think it is better to bury it at a depth of 3 to 5 m. This type of geothermal heat pump occupies a large area and is easy to cross with other pipelines. , affecting construction and protection, so this is not done at national level. There are some, but they are cheaper.Usually the vertical pipes are 60-120m long and a well costs about 10,000 yuan? Either way, it's about the same amount, and it's quite expensive.