I think the difference is A/C is more of a modern comfort that allows us to live in hot places. People could live in cold places without any modern technology o

I think the difference is A/C is more of a modern comfort that allows us to live in hot places. People could live in cold places without any modern technology or utility service. Fire and a pile of wood was all it took. Both are essential in either extreme, but we've had one solved for much longer.