Here’s a couple examples from my life:
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Safety Razor. I get a better shave and it’s like $15 for 100 razor blades, which lasts me a couple years. Way way way better than the disposable multi-blade Gillette things, which sell 5 heads for $20.
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Handkerchiefs. I am prone to allergies, so instead of constantly buying disposable tissues, we now have a stack of handkerchiefs that can just be used a few times and then thrown in the wash. This has also saved me loads.
What about you?
My thermostat has a setting which allows for a greater temperature swing. I have it set at 2*. With the temperature set at 68f the heat refill not come on until the temperature reaches 66f. This causes the heat to run longer but less frequently, which is more efficient than running in short bursts. I also have a setting which runs the fan for a few minutes after the heat stops which scavenges the remaining heated air out of the air ducts.
I also open up my eastern/southern facing drapes/blinds in the morning to allow the sun to heat up the house through the windows for some free heat throughout the day.
Probably doesn’t apply to >90% of people here, but if you ever get to build your own house, build it so the longer side faces south, and the shorter side west (in the northern hemisphere). Then you get more midday sun in the winter when the sun is further south, and less evening sun in the summer.
Removing the window screens in the winter helps a lot too.