[brianshaler]

I think the point GP was making was that hot daytime temperatures in desert climates tend to coincide with peak renewable energy generation, while at higher latitudes in cloudier places the the source of energy is more likely to be from combustion.

[bluefirebrand]

If we're only worried about temperature, sure

But fresh water is a pretty huge concern as well and moving/producing large amounts of that in extremely hot areas is going to more than offset the difference in heating costs