I mean insect screens. If you've got biting/disease-spreading insects you can't open your windows when it's hot if you have no AC. There were very few biting

I mean insect screens. If you've got biting/disease-spreading insects you can't open your windows when it's hot if you have no AC. There were very few biting insects that I saw in France/Germany/Switzerland but with climate change they will probably arrive and compound the heat problems. I have been told northern Europe (Scandinavia) has plenty of biting insects like the US. The walls were thick everywhere I saw but they just looked like concrete walls, not walls with modern insulation. Someone mentioned above modern insulation is significantly more effective than concrete.