I think because in many places in the past people coped fine so there is a scare that this AC popularity will increase energy usage. You are correct that Heati

I think because in many places in the past people coped fine so there is a scare that this AC popularity will increase energy usage. You are correct that Heating in cold climates probably is worse. AC has the advantage that the load matches sunny summer weather. At least in Europe - Asia and Eastern USA the humidity at night is an extra problem.