Air Con in a Warming Climate

I saw a comment on a post somewhere a few days ago, I'm afraid I have no specific recollection of exactly where, but it was a post (video?) around the topic of Americans having rooftop solar, the strange reticence around it, and the benefit it could have both on the personal and the global level. A commenter said something to the effect of "I have solar and I've been blasting air con all summer and my electricity bill has been like $8 a month". On its own this is probably just standard hyperbole, but it's been bouncing around in my brain like a maths puzzle, the more I think about it the more I come draw towards a conclusion - solar powered air conditioning is just... completely free right? Environmentally, I mean.1 This does involve disregarding two major factors: The production impact (chemicals, installation energy, material extraction) as pretty much every manufactured object has that as a fixed cost massively amortised over a long service life The displaced energy usage of other…