European != middle class.
In Eastern Europe, not so much.
edit: I'm glad that you mention Eastern Europe, which is where I come from. Paradoxically, more people die from cold in the West, because their milder climates don't force them to invest in insulation.
edit2: the previous claim may be based on flawed methology, see https://academic.oup.com/jpubhealth/article/38/4/806/2966950