this post was submitted on 15 May 2025
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Microblog Memes

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[–] 200ok@lemmy.world 32 points 1 month ago (15 children)

Fuck those A/C units that require leaving a card in them to work

[–] milicent_bystandr@lemm.ee 11 points 1 month ago (8 children)

Eh, if you're leaving your ac on all day when you're out, that's quite a waste. Card operation helps avoid accidentally leaving ac and lights on.

[–] CaptDust@sh.itjust.works 11 points 1 month ago* (last edited 1 month ago) (5 children)

Is it more efficient to cycle the room temperature though? I've heard it's better to get a room to temp and the machine can work less to maintain it. But maybe that's old advice..

[–] Markus29@feddit.nl 9 points 1 month ago (1 children)

That is old advice. AC works pretty fast, especially in a small hotel room. If you have floor heating/cooling and a heat pump then it would make sense to leave it on all day.

[–] CompactFlax@discuss.tchncs.de 7 points 1 month ago (2 children)

Air conditioners are heat pumps.

[–] Zink@programming.dev 2 points 1 month ago (1 children)

I think that advice is specific to the “underground heat exchanger” type of heat pump.

[–] CompactFlax@discuss.tchncs.de 1 points 1 month ago

It’s not; air source are also not particularly fast to make significant temperature changes compared with gas or electric heat when appropriately sized.

It is more specific to radiant (water/steam/in-floor) solutions though, as that is very slow to adjust

[–] Markus29@feddit.nl 1 points 1 month ago

Yes I know, I meant air/water heat pumps which heat/cool the mass of a building instead of the air. AC units are oversized more often than not and are not that efficient at modulating. I think it's safe to say that it's more efficient to turn it of when you leave for more than an hour or two

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