Cold kills more people according to the literature [1]. Heat deaths are rising, cold deaths are falling. Not in the same places though. Countries near the equator are going to suffer more than countries at higher latitudes.

Demand for air conditioning is expected to more than triple by 2050 (consuming as much electricity as all of China and India today). [2]

[1] https://www.thinkglobalhealth.org/article/hot-cold-and-deadl... [2] https://www.climatecentral.org/climate-matters/hotter-climat...