The last time I was in an African city there wasn't air-conditioning as standard in houses. Sure, windows were open in summer, but closed up in winter. Office buildings had the usual levels of ventilation. I can't really describe this as "better" - how about you?

The population is perhaps much younger in Africa as well? The healthcare system is also less advanced / widespread so there are fewer people living with underlying illnesses that increase the severity of Covid once infected.