[curiousllama]

The study did model excess deaths, not total deaths.

But to your point (from the study): > The excess death fraction of total deaths was 0.67% (95% confidence interval (CI) 0.58–0.74%) for heat-related deaths and 5.09% (95% CI 4.64–5.47%) for cold-related deaths. The relative risk of death was 1.057 (95% CI 1.046–1.067%) per 1 °C higher temperature during extreme heat and 1.034 (95% CI 1.028–1.040%) per 1 °C lower temperature during extreme cold.

So of those 1M, it looks like 90%ish were cold-related (though more extreme temps are equally dangerous in both directions).