Funny enough Germans appreciate good ventilation, but here we have following: wind outside - ok, same wind inside (draft) - you killing me. Always wear slippers inside, protect your feet and neck from coldness. Avoid AC at all costs, especially bad if it blows right into your face. Also no fans right into your face or body. Wet hair - do not under any circumstances go outside. Even the most respected people I know fall into this trap.

Possibly some confusion comes from rhinorrhea - people mix up these symptoms with actual disease. And most ironically lack of appropriate ventilation increases spread of respiratory infections.

Last decade+ we had a bit of a HRV fad, wonder if that is reflected in some stats. Anecdotally I heard people shut these off to save power and open window instead...

Extrapolate salaries, cost of living and that's more like 3k in your money.

That said magic happens when government subsidizes things. Friend spent 8k euro for 10kW solar + 15kWH battery system, of which government reimbursed 7.8k. 1.35k USD for entire system, when you'd pay this much for someone to plug some cables for half a day.