Your understanding of what is driving Climate Change has been successfully focused entirely on a complex of guilt and shame within you about your own carbon footprint.
This is leading you to suggest that installing a lifesaving tool that takes up some energy is not worth the thousands and thousands of lives it saves during heatwaves.
Please stop denying your own humanity and the humanity of others and focus on fighting the actual drivers of Climate Change before you end up accidentally killing yourself just because you couldn't live in a way that perfectly minimized your impact.
This is NOT a slippery slope we all should be obsessed with, it is not that slippery and there are far scarier slippery slopes all around us that should be getting our attention.
Ultimately being against AC is just another form of ecofascism hiding in the language of personal responsibility to obscure the responsibilities of capital, industry and society.