[pdonis]

> Maybe humidity makes it closer to even?

If the humidity is high enough, it can take it past even. But you won't find that out by comparing summer and winter numbers in the same location, because there aren't a significant number of locations that have both summer and winter conditions severe enough to push the numbers. You would want to compare, say, Canada in winter with south Florida or south Texas in summer (or, for even more extreme, northern Scandinavia in winter with southeast Asia or equatorial Africa in summer).

[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.

[yesbabyyes]

Sweden can range from -25 to 35 °C. Heat pumps are common, both downhole heat exchangers (rock heat we call it) and air source heat pumps, among home owners.

Central heating is also common and often heated by garbage.