Hope this helps someone struggling to survive the heat
this post was submitted on 26 Jun 2026
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I don't understand your statement. I can have the windows closed all day with no AC and not worry about rising co2 levels. Why would it be different with this device running and circulating air? It's not like it emits co2.
This looks like a wall mounted monoblock so you would be right ~~but if it's a split device with an outside unit, it does actually bring in fresh air.~~ This is wrong, split units dont bring in fresh air either. The only setup that consistently brings in outside air is a monoblock with 2 ducts. Either way, I'm pretty sure running an AC with the windows open is never good advice even if you can afford it.
The only point of concern would be if you have a gas heater for water etc. in your apartment and run a monoblock AC with just one exhaust hose blowing hot air outside while sucking in new air from the inside. In that case, the negative pressure created by the AC can potentially pull gas that would usually go out the chimney into your apartment.
There's ductless mini split units that bring in fresh air?
Comment deleted because it was a load of nonsense
LOL! I was just about to "well, akshually" you about minisplit design!
CO2 always builds up in the room with no airflow, and when jt gets above 1000 PPM it starts causing fatigue.
And how exactly does an AC intensify this issue? Because lets be real it's not really a problem people usually face in their daily lives. Some people leave their windows closed for days during the winter (Which is also bad because of mold etc. but thats another story). Most places are not nearly well insulated enough for it to be a problem. And if it was a problem, having an AC device or fan that circulates the air and evens out the co2 levels across the house would actually help alleviate it somewhat
It doesn't. They said "if you close the windows", although leaving the doors open and opening one window slightly will get CO2 down significantly.
Bad solution. Like in winter, open the windows fully and exchange all the air when needed. A slightly open window is very inefficient.
That's the thing about co2, you don't really notice it unless at extreme levels, but it definitely affects you, at pretty much all levels.
That's the common misconception. The lines running between minisplit units are for refrigirant, not air. It's essentially a fridge without a box, with the room where theyre mounted becoming the box instead.
It doesn't. It's just that people who run AC's usually shut everything closed and then exhale all that co2, which in an ordinary room with just 1 person in takes <1hr to reach noticeable impairment levels. AC or not, ventilation is important.
You're probably thinking about carbon monooxide, not carbon dioxide?
You're right I was wrong about that, sorry lol.
You might be right but I am certainly not opening my windows once an hour during winter, if that's the standard then we're all screwed by the time we go to bed with the windows closed. I don't think this problem is significant enough to justify running an Air Conditioner with the windows open...
Yes, I am. As that is the only "real" concern I see with AC's and gas buildup. As I said co2 is just not a big enough issue to justify not getting an AC or letting it run out the window. Regularly airing out should be common sense, but I think once or twice a day is regular enough for the average apartment
Just to be clear, I dont mean wide open, just a litte slit to let some air in, which should be totally enough to keep levels below 1000ppm. If you're just airing twice a day you get to 450-ish briefly but it jumps back in an hour or two and you spend the rest of the time somewhere in the 1500-3000ppm range. And I feel that about winter, yeah, it's either warmth or fresh air, gotta choose one. Not even heaters can spare one from annoying cold breeze. But in summer it's at least avoidable. Whole point is, even right now where I am, whenever I go anywhere, I see AC's set to some stupid low settings, like 18C or lower, so the places are colder than they are during winter, but the air is so stale I feel like I could swim in it, which is arguably even more wasteful than running AC straight out the window. But it's so hard to get the point across to people, especially the oxygen-deprived ones inside those places...