Comfort 6000 Portable Air Conditioner A (AXP34U339HW)

You did the right thing. I kind of regret getting this, it doesn't quite cool down my room (47 m2). I'm not saying it doesn't have an effect, it does, but it's not as good as I'd expected. On the flip side, I haven't been able to completely seal the window that the exhaust runs out of. It's only been a day, hopefully things get better with better isolation.

We have 2 AEG Comfort 6000s to cover our 3 bedroom flat. Absolutely brilliant piece of kit, highly recommend them. They’re not cheap but after the first one I got was broken from the get go (and then the replacement was too) I didn’t want to mess around with cheaper ones.

Screwfix are pretty decent so should do for ops price range. Lots of sales on frequently enough too.  If OP could stretch then I'd say AEG as I bloody love mine. Was in same place and splashed a bit more after a horrible night of don't touch the air surrounding me arguments the other summer.  Been bliss ever since.  For the window, you can get little kits off amazon where you put some double edged velcro tape 9nto your window and put this plastic sheet around, let's you chuck the thing out the window and keep the room fairly sealed.  You can also get extensions for the tubes easy enough too, which is great of you only have that small top window or can't put it near the window. 

If you can buy Midea Duo PAC which is a dual hose portable ac definitely worth it. If not you can get an Electrolux(AEG) one and make it simply dual hose with a 3D printed back side. Split ACs are simply unbeatable. They could be also used for heating too. But the installation costs etc are not small in UK I believe. Mitsubishi, Daikin, Midea are great for split ACs. You can also dehumidify your house with ACs. I am not living in UK but I'm a renter so I have a PAC in my bed room but luckily my living room had a split AC. We have very bad humidity in the summer

We used to have a Meaco one from Costco within that price range, and that broke within a year. Since then we tried an AEG one which was terrible, and now have a De’Longhi Pinguino. It looks like Currys have a couple near your price range. We also have a still working De’Longhi dehumidifier which is probably old enough to vote, and so while now I’ve praised them on the internet I’m sure they’ll both break immediately, I have some faith in the brand. Would definitely suggest considering spending a little extra on one of the Pinguinos if you can.

The AEG in my area is about 300$ Doesn't have a battery and only has an exhaust hose which means it will create negative pressure in your room.

Electrolux klimu mam a je fajn. Sice to dela kraval, ale necha se to.