[galangalalgol]

Scandinavia in winter won't usually be a heat pump to air though right? Don't they heatpump from geothermal?

Even just locally here the 25 degree F differential with ~50% relative humidity in summer would be interesting to compare to the 60 degree F differential in winter. Maybe those ultra efficient hygroscopic dehumidifiers will finally enter production.

And heat pumping to geothermal for summer might help too. I know some people locally do that. Big investment though.