I only use a portable heater in my hometown when I want to pre-heat the bathroom and it's exceptionally cold, as there is not much a culture of having a fully-heated house in my country. Well, nowadays that most residential air conditioners also have a heating function, it's a different matter for people who have HVAC at home, which is not my case. I only use fans and a portable heater at home. My father OTOH often uses the portable heater when he comes to my apartment during winter.
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