I've bought a portable AC unit, and on day one have now gutted it to upgrade to a dual hose system. 

  
After these changes I've noticed a ±33% increase in efficiency, but it's not been the most scientific test, especially because with my inadaquate way of sealing at the window, I still have a lot of air leakage (that's the next thing to solve). For now, I'm wondering if it's been done OK, having followed these guides: 

1. [https://www.youtube.com/watch?v=rh6fk2AucP8](https://www.youtube.com/watch?v=rh6fk2AucP8) (hopefully a link in body as reference isn't against the rules)

2. [https://www.woolie.co.uk/article/convert-ac-from-single-hose-to-dual-hose/](https://www.woolie.co.uk/article/convert-ac-from-single-hose-to-dual-hose/)

  
That said, with the setup as-is, I still have two problems, and it's making me wonder if I've done something wrong or just need to improve the ducting/sealing at the window.

1. I feel air rushing in from under my office door, even with the mod (maybe less, I can't remember)

2. the thermostat basically permanently (on the unit) will read either 23 or 24. I think air isn't getting to it the way it used to (though, not sure what to do about that, because surely blocking the air inside would make sense, like I did? Else it'd be measuring the outdoor air...? Still, I think it is largely measuring the outdoor air as it is now, maybe because it's got a long copper pipe running into the 'room' where the outside air is being sucked in. I don't really want to drill a hole in the unit to make room-air reach it, either... Hopefully the photos show the thermostat, but I'm not even sure because I'm not an expert...

  
ps. I tried to put a video and photos here but that isn't possible, and my converted gifs all end up being too short to show something useful.

Advise appreciated... I am a noob trying my best.



Dual-Duct AC Converter (is this right?)