Smart watches.
Couple of reasons:
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I like my mechanical watches. They aren’t the expensive flashy ones, but I like the way they look and especially like the mechanical engineering. It’s one of the (maybe only?) Item I can think of that I use daily and ‘does something’ without electricity. Smart watches are nothing like that.
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When I want to be offline I can just ignore my phone or flip it upside down. Having notifications on my wrist all day long wouldn’t be good for my mental health. It annoys me so much when I see people looking at and using their smartwatch mid conversation because they are so addicted to it. And I know I would be the same once I start using it.
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It’s expensive and e-waste after a few years.
The problem is that the windows might not be suitable for window units. For instance in the Netherlands our windows typically tilt or turn (like a door) open, they don’t slide up. The walls and ceilings are usually solid brick or concrete, so you can’t hide ducts in there for central AC. That leaves a split unit in one room or a portable unit.
Blocking the light made a huge difference in my house. I have are 3 small skylights on the south side that now have sun shades on the outside. They still let in some light, but it’s at least 5c cooler on the top floor.