Heatpumps are commonly used all over scandinavia. They work fine even with extreme temperatures. Temperatures stay well above 0 Kelvin. So there's still plenty

Heatpumps are commonly used all over scandinavia. They work fine even with extreme temperatures. Temperatures stay well above 0 Kelvin. So there's still plenty of energy to pump around. Of course with extreme temperatures you need to produce more heat. Which simply means you need a bigger setup.