About 90% of American homes have air conditioning while only around 20% of European homes do, a gap that's now highlighted during Europe's record-breaking June heatwave. The headline frames this as a cultural incomprehension, but the underlying facts are solid — Europeans historically built for cooler climates and relied on design features like shading and ventilation instead of AC, while Americans normalized cooling as standard. As European summers get hotter due to climate change, adoption is starting to shift, though the infrastructure and cultural preferences still lag far behind the US.