I would invite you to spend 30 minutes in the deep South during August and tell me that AC is a luxury, assuming you haven't already dropped dead from wet bulb conditions.

Shitty cardboard box homes are a major contributor to higher energy usage, yes, but that's not something the overwhelming majority of Americans have any control over even if they own their house. Residential AC still pales in comparison to energy usage by commercial real estate or industry, which contribute far more emissions and are much more relevant to tackle first for handling climate change.