Originally Posted by The Atheist
Not sure about Hawaii. They have an indoor mix of places kept cool with A/C and others that don't. Pretty humid weather but high temps are rare. Similar to Florida earlier this year but Florida gets pretty unlivable w/o A/C in summer.
Florida is currently having rapidly spiking cases. Humidity there is always very high. But there are other factors. Covid-19 seems to spread mostly indoors and in the intense summer heat lots of folks are spending more time indoors. A/C, of course, removes a great deal of water from the air.
Most all indoor heaters do not add water to the air while the majority of A/C units remove water from the air.
Worse in the winter in the USA North because air is heated and indoor humidity is typically quite low (heating air reduces relative humidity) while Florida temps are quite mild but with very high humidity. It's common for Florida indoor humidity to be higher in the winter than summer.
I see this as a possible factor in a complex, multifactor system that determines R variations in places and cultures. I don't see it explaining differences in regional IFR variations and that would be more useful in fighting the bug.