“Heard today that in germany they have roll-down shutters over exterior windows.”
We have those here in Texas also. (remote control and automatic)
Here in South Central Texas, there’s a fine line on how much or how little insulation we use. Due to extreme temp variations and the nearly ever present humidity, houses need to breath in order to adjust to the conditions and prevent mold growth.
Unfortunantly, Tyvek and Stucco covered foam present problems.
Yes, the devil is in the details, differing climates mean differing responses. Here in MT we have 15 hour long winter nights, still longer up north, it makes economic sense to have insulated, automatic window shutters. The problem is the cost/benefit ratio, that’s where the gov’t could help with a 90% matching funds program, as a mechanics lien to be paid back over many years.