this post was submitted on 15 May 2025
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Fuck those A/C units that require leaving a card in them to work
I haven't seen that but I believe you. Can you not just get an extra card from the front desk, or do they have it further enshittified in some way?
I've been in hotels where it's just detecting that the slot is filled the card doesn't matter. So you just use the cardboard sleeve the card came in.
Also been in newer ones that have RFID cards though that are harder but not impossible to spoof
Oh really? I can't say I've come across the RFID style—basically every hotel I've stayed in over the past few years still happily takes my supermarket loyalty card in the power switch thing
How do you go about the spoofing of those and is it anything simpler than just creating a duplicate card?
Yeah you'd need cheap RFID blanks and a reader/writer. I do it with my phone easily enough. Just read the hotel card, copy, write to new card
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.
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..
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.
Air conditioners are heat pumps.
I think that advice is specific to the “underground heat exchanger” type of heat pump.
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
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
Exactly. It’s an energy conservation measure
Any card works though, you can probably buy blank ones for this purpose.
A library/gym membership card or supermarket points card will work nicely. I’ve yet to find a hotel that takes electricity conservation so seriously to install card switches with RFID readers.