Cold kills more
Every summer there are stories about Europeans dying in the heat, often followed by the usual point about air conditioning.
Heat does kill people. But if you look at temperature-related mortality overall, cold is the much bigger problem.
Across Europe, cold-related deaths outnumber heat-related deaths by roughly eight to one. Most of them happen quietly in winter and get much less attention.
The US comparison is also interesting. Despite much wider use of air conditioning, cold-related mortality per capita is not obviously lower than in Europe.
I got curious about this and put some numbers and sources here: