[ProfessorLayton]

It takes a lot less energy to cool down a dwelling than it does to heat it, due to the delta between the inside/outside being a lot lower when it's too hot vs when it's too cold (Which can easily go into the negatives).

Sure, it takes no technology to start a fire in an emergency, but that can't be done at a mass scale for non-emergency habitability without making the problem worse in the long run. AC can run from the very same energy that's heating up a dwelling, and power grids will need to be adjusted to incorporate more clean power sources.

[ttfkam]

> It takes a lot less energy to cool down a dwelling

...only in low humidity. Also, PV solar efficiency drops quite a bit as the temperature goes up. Carnot efficiency also drops noticeably as your cold sink, the ambient environment around you, heats up.

Are you going to provide AC to all the livestock and crops as well? Because they're kind of important in the long run too.

[ProfessorLayton]

Running AC lowers the dwelling humidity, so I'm not sure what you're referring to. Lower PV efficiency means some margin/overcapacity will be needed, not free but also not an insurmountable problem either. There's more energy being cast upon earth every single day than we'll ever need, and the same cannot be said for hydrocarbons.

Temperature control for livestock applies to cold climates too, so kind of a moot point to mention one and not the other.

Running AC in hot areas does not necessitate making climate change worse. Heat pumps are very efficient in cold climates too, but it doesn't change the fact that much more energy is required due to the temperature deltas being dealt with.