There's a bit of strawman here. The article is comparing air source vs ground source heat pumps without mentioning the major differences. Yes, heat pumps work

There's a bit of strawman here. The article is comparing air source vs ground source heat pumps without mentioning the major differences. Yes, heat pumps work in the Nordics ahem with the additional CAPEX cost of installing ground loops. A ground source heat pump is NOT a drop-in replacement like an air source heat pump is. Interestingly, Google spun out a company called Dandelion Energy which focuses on installing ground source / geothermal systems.