Hope this helps someone struggling to survive the heat
this post was submitted on 26 Jun 2026
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wow a shocking amount of people here have no idea how AC works
What are you referring to the image? I assume it is piped out the wall to the other portion of the heat pump?
no, here as in the posters.
ac units produce co2 and require the window to be open… and such
It actually does require some basic knowledge of thermodynamics. Many people think "there are space heaters, so why not space coolers?" The reality is that the heat needs to be pumped out of the room (meaning hot air needs to be vented to the outside of the building).
It makes the air cold. What's there to understand?
It makes the room cold unfortunately to make the room cold you have to whack a sodding great hole in your wall. You explain that to the landlord who doesn't care about your comfort, but they could care immensely about the wall having a hold on it.
With that logic, leaving your refrigerator door open should cool the room. But doing so would actually heat it up.
Yes because the job of the refrigerator is to extract heat from the small area and dump it out the back. An air conditioner is the same thing but it is designed to extract heat from the entire room and dump it outside.
The problem is unless you have ducted heating all that's going to do is cool one room. UK homes aren't built with ducted heating. So the best you can get away with is one room cool and everything else is still unbearably hot. All of which is assuming that the landlord is ok with me punching sodding great holes in the wall. Even for people who own their own homes the cost isn't worth it, it's incredibly expensive to buy an air conditioning system in the UK and then literally no one knows how to fit them. Isn't just a matter of buying one.
Ours have a hole about 50mm in diameter. It's not going to bring your wall down and if you decide that you don't need the efficient heating/cooling with minisplit-unit it's easy enough to patch. I own the house, so I didn't need to think nothing else than the location of the hole, but any sensible landlord would see a minisplit-unit as an increase of property value.
A sensible landlord would recognise that yes but only if they got to keep the air conditioning system. Realistically though the tenant would probably want to take it with them when they left after all they bought it. And the landlord might not want the owners to be on them to buy it off the tenant when the tenant leaves.
In a sensible world landlord would purchase the unit in the first place for tenant. It's somewhat common in here that if you want to use your own time and effort to make your (rental) home nicer the landlord pays for the materials. It's commonly used for things like paint or wallpaper, but replacing kitchen kabinets or other bigger renovations are not unheard of either.
But yeah, that's obvious issue which should be resolved before installing anything. I wouldn't buy 1000+€ unit as a gift for the landlord. And you'll likely need a permit or two before drilling trough apartment walls anyways.
I wish I could upvote this 100x.
Do y'all not have windows?
Not the type you're thinking of. We have windows that open like doors rather than the American style guillotine things, which have always struck me as inherently unsafe, but I suppose it does have that one benefit.
Let me fix that for you. A shocking number of Europeans have no idea how AC works.
The northern half, basically. Down south we very well do. What a lot of people are unaware of is that an air source split costs peanuts, and lowers your heating bills like 300-400%. Yeah not 30, 300%
300% reduction would mean you no longer pay for heating and instead get paid twice as much as you used to pay