In some cases A/C literally makes normal functioning possible, and is thus a boon to society and opens the argument to what level of environmental costs are worth it.

In other cases, A/C allows someone to not have to change to lighter clothes to be comfortable, or they have poor insulation and thus have to use A/C far more than they otherwise would. In these cases there is much less argument that A/C is worth the environmental impacts.

Exploring the difference is valuable - instead of arguing "Good/Bad", we can start arguing "How can we make things better?". Reducing unneeded A/C is just a good idea, and admitting that A/C has environmental impacts does not mean we have to instantly ban it.

We shouldn't compare A/C against heating because there's no value in knowing if one is "better" - we need both. We should instead act to reduce unneeded A/C use _and_ unneeded heating use (and to keep, if improve, needed uses).