Hey, if air conditioners do cause global warming, why not just open the windows and let the cool air-conditioned air out to cool things off outdoors?
The neighborhood didn't get dehumidified though ;^)
Because that would violate the laws of thermodynamics.
Refrigeration-type A/C units work by exchanging the warm inside air with cold air using a heat pump/compressor. This is why the air immediately outside a window A/C unit is really hot.
Evaporative-type units run cold water past a set of fans, like a radiator. The now-warm water is then taken away, and re-circulated. The water can be initially cooled using a cooling tower (like at a nuclear power plant), or even a hybrid refrigerator system. (i.e. the water is cooled using a refrigerator system, like a water fountain)
TL;DR: If the cool air is let out, the temperature returns to equilibrium, according to the first law of thermodynamics and/or the law of conservation of energy.
But that wouldn’t matter to the warmists now, would it?