I get that a lot of houses in Europe don't have built-in air conditioning.

What I don't get is the argument that houses built to hold in heat in winter are inherently hard to cool. Insulation works both ways? In Texas, we want as much insulation as possible!

I get it's an infrastructure problem but it's one that has been staring Europe in the face for decades.

@gwynnion I think it depends on the materials used for construction. Niche anecdote: my Texas farmhouse was built of modern eco-esque materials and does fine in both summers and winters. But my horse barn is a simpler (cheaper) basic concrete block construction. After a full day baking in the summer sun, it continues to radiate heat back inside all night. I can’t keep horses in there at all from July-September, it’s an oven.