I would imagine in the southern states where it's 40 degrees C+ every day for 3 months-4 months or more on end the heatpump (aka reverse cycle a/c) is basically kept on constantly. Let's say it draws 1kw on average, that's 24kwh right there. They actually draw more than that. There's no way around it if you want to live comfortably. But I think the whole society is designed so much around driving everywhere and living in detached houses that the low hanging fruit is actually to install solar/batteries for these guys.
Personally I am convinced by now the difference is mainly cultural, how people live. Some things ~2x size (i might be off a bit but the list is large, I am open to be convinced otherwise) :
Fridge
Clothes dryer
Food plate fullness
Amount of conservatives in food
Car HP and m2 parking space
PC PSU wattage
ml in medium drink
amount of ice cubes in cold drinks
Tap water full flow rate
Breakfast calories (bacon/eggs)
Sugar in bread
Amount of packaging material resp. content
kg of luggage in flights
Number of short flights / person
Cars/ bicycles ratio
Still, it just amazes me. Its not because of wealth or temperature.
Again, I am open to corrections, I am curious about other's thoughts and want to learn.