One of the problems of aircon is that it deposits the heat into the surrounding air, adding more heat in the process and increasing the temperature gradient. De

One of the problems of aircon is that it deposits the heat into the surrounding air, adding more heat in the process and increasing the temperature gradient. Denser cities also heat up much faster since they restrict air flow and replace for example trees or other areas that can buffer or reduce heat. So cooling a city gets harder as it grows denser. If you want to warm up your city, all of this is in your favor.