Obviously no one wants this to happen, but I wonder about any possible mitigation strategies. Like creating homes and infrastructure under the ground, or at least covered by lots of insulation, like a Moon base covered with lots of dirt.
Of course, that would completely suck for the people who have to live there, and we should do our best to prevent it, but some people probably aren't going to have a choice but to try and handle it in whatever way they can.
One kind of building that I came across is called an "Earthship", which relies on "thermal mass construction and natural cross-ventilation to regulate indoor temperature".[1]
It will be somewhat difficult to retrofit buildings to take advantage of e.g. thermal mass inertia, but I'm hopeful that new construction will increasingly favor passive/low-energy cooling methods.
Of course, that would completely suck for the people who have to live there, and we should do our best to prevent it, but some people probably aren't going to have a choice but to try and handle it in whatever way they can.