Completely different worlds. Atlanta is a 'newer' city and in the south. You have to have A/C there. In 'older', cooler cites like Chicago, NYC, Boston, Detroit Etc. it's more common that the buildings are 100+ years old and were built before A/C was even a dream.
Literally everyone I know has a window unit, myself included. Built-in A/C in NYC is really hard to find at a reasonable price.
I think a phone controlled A/C unit is a great idea if the price is right.