>are just becoming a thing where do you life? in germany they are available for years already. friends built new homes with them 5-6 years ago and back then it

>are just becoming a thing where do you life? in germany they are available for years already. friends built new homes with them 5-6 years ago and back then it was already established in all differen varities. air or with geothermal pipes in your yard (either surface or drilled)