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https://www.constructiondive.com/news/study-90-of-us-homes-are-under-insulated/406638/#:~:text=The%20North%20American%20Insulation%20Manufacturers,as%20decreasing%20homeowners%27%20comfort%20levels.
http://masonrydesign.blogspot.com/2014/01/european-construction-versus-north.html?m=1
Then there are some design choice difference that also matters. In the US average ceiling height is around 9 foot. In Europe it's 11. Open floor plans are more common in the US. It's a trend coming to Europe but given the average age of a house in Europe it's still relatively rare.
Yes, the USA has plenty of well built houses. No one is arguing against this. And the climate plays a bigger part why most of Europe doesn't have AC. But the statement is still true. European homes are generally built without taking an AC into consideration and are trying to fix the issues in a passive way because of it.
The USA aren't the worst offender either. Australia has it way worse. They have some of the worst insulation and are melting during summer and freezing during winter. Despite spending an ungodly amount on cooling and heating.
I recently got all new insulation, central ac, ducts. Just getting new insulation helpped a lot but I dont how much is enough. The company just showed a chart and said this how mich is standard here. Yes it is an american home yes it is brick.
Hmm, my apartment building is mostly cinderblock and concrete, I have 12 foot ceilings, I'm on the first (above the entry) of five floors so hot air should rise away, and I have good double glazing with UV blocking film and screens. But mid-afternoon when that low-latitude Southern California sun hits, and the Santa Anas are blowing off the desert, even closing all the curtains and turning off appliances can't keep it cool. So we set the AC for 77 and swelter until the sun goes behind the building across the street. And I make sure I get all the day's cooking done in the morning so I'm not adding any heat. I've seen Europeans come and sunburn themselves because they think they know how long they can play in the sun but they haven't met OUR sun. It's just more direct.
It's very very common in the Northeast to not have AC in spite of the wooden construction and lack of insulation. No one in my family from upstate NY has AC. The climate is the vast majority of the reason there's more AC in the US.