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Does it ever make sense to have the window open with AC on? (infosec.pub)

submitted 1 day ago by howrar@lemmy.ca to c/nostupidquestions@lemmy.ca

9 comments fedilink hide all child comments

Say it's 25C outside and 30C indoors. I want to bring the indoor temp down to 25C, but opening all the windows barely makes a dent. Does it make sense to have the AC turned on and set to 25C while I have the windows open? Or should I be closing them anyway?

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[–] cecilkorik@lemmy.ca 3 points 1 day ago* (last edited 1 day ago) (3 children)

Yeah, the humidity is a very important factor here.

Latent heat of vaporization causes some very non-intuitive temperature physics when you start condensing or vaporizing any fluids. Fun fact: A 300W(electrical) dehumidifier functions as a ~1500W(thermal) heater. And it doesn't necessarily feel like one, because our perception of heat is intrinsically linked to humidity. But that only happens if the air is very humid. It's the reverse of an evaporative/swamp cooler, which likewise only works effectively if the air is NOT humid.

[–] TheMadCodger@piefed.social 1 points 22 hours ago (2 children)

Wait, what? I want to know more. A dehumidifier acts as a 5x wattage heater, but we don't feel it?

[–] cecilkorik@lemmy.ca 5 points 22 hours ago (1 children)

TechnologyConnections is so glad you asked!

[–] tal@olio.cafe 1 points 17 hours ago

I was familiar with the material he covered, but he also mentioned another video where he compared a "dessicant wheel" dehumidifer (common in the UK) with a vapor-condensation dehumidifier (common in the US), and that was really interesting, as I'd never heard of a dessicant wheel dehumidifer before. Thanks.

https://www.youtube.com/watch?v=JzClLWL-Eys