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The fridge door one came up some time ago on HN with actual data to back it up from "smart" fridges. Some people with kids said it was opened well over 100 times a day which shocked me.

If TV/film/YouTube is anything to go by the habit of leaving the door open for extended periods is common too. That one really grinds my gears. I just can't understand a brain that doesn't tell you to minimise the amount of time the door is open. It's one of those things that makes me realise how fundamentally different people can be.

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arp242 2 days ago | parent | next [-]

A few years ago I had a housemate who would fill up the kettle all the way to the brim, would wait for it to boil and then she'd make a single cup of tea and let the rest go cold. Every single time. This unreasonably angered me.

	▲	globular-toast 2 days ago \| parent [-]
		Kettle fillers are bizarre but I think there's slightly more to it. Some people think they are being rude if they only prepare enough food for themselves. I think kettle fillers may believe they are doing a service for others when they fill. But that's really stretching the benefit of the doubt here. They may just be thick. I can actually top this, though. In my student days I had a guy from a hot country move in. Apparently the water from the tap was too cold so he would warm it in the kettle. The trouble is the kettle is too hot... So I watched in utter disbelief as he boiled the kettle, poured boiling water into a pint glass, then carried said glass to the fridge to cool it back down to drinking temperature! Later I came back and he'd forgotten about the water so it was now colder than tap water in the fridge.

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uncertainrhymes 2 days ago | parent | prev | next [-]

My math may be off, but it seems like 2000 joules to cool the volume of air 1 degree C vs 6,000,000 for the same volume of water.

It's the stuff in the fridge that takes the initial work, repeatedly exchanging the air is maybe a rounding error?

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herbst 2 days ago | parent | prev | next [-]

When I bought a fridge for my camper I realized why nobody who cares about power usage has a common standing fridge. Every time you open the door the cool air falls out, it sucks in the warm room air and has to start over again.

While "camping coolers" just keep the cold air inside.

My fridge doesn't cool when the door is opened, not even sure if slightly longer opening times make a huge difference when the complete air is exchanged in seconds anyway.

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userbinator 2 days ago | parent | prev [-]

100 times a day might be bursts of many times in short succession, which is definitely preferable to leaving the door open for what might be a longer cumulative time.

	▲	wffurr 2 days ago \| parent [-]
		Minimizing the number of openings, even in favor of longer ones, would reduce the number of times the air in the fridge is cycled. You can probably chart this and calculate an optimum.