Hope this helps someone struggling to survive the heat
this post was submitted on 26 Jun 2026
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Or just portable, single unit ACs. I got one of those recently.
It blasts hot air through a duct that hopefully you're able to direct outside while preventing outside air from getting in. Also noisy as heck, since the full unit is inside the house, and not as efficient as split units, but they do work...
If that worked you'd slowly turn your dwelling into a vacuum chamber :-)
The same volume of air will enter your home in one way or the other, the important bit is that it's cooler than the exhausted air. In particular you don't want the hot exhaust to recirculate back in.
Ideally you'd get medium warm air from another room into yours, and warm outside air into an unoccupied room.
Dual-hose portable ACs avoid the vacuum problem. You just need to have good sealing around the intake and exhaust hoses.
So it creates positive pressure in the house?
The air that is brought in from outside via the intake hose is the same air that is heated and then ejected through the exhaust hose.
In theory, it shouldn't cause a change in pressure.
So there is a separate intake and output inside the house for the cold air?
Outside air. If you are using AC, the intake probably isn't cold. But: air in => heated up by the AC => sent out.
2 hoses in the window that connect to the back of the AC unit.
If it’s blowing cold air into the house, there has to be an equivalent volume of air leaving the house.
Air from room is cooled and that same air is blown back into the room after being cooled.
Air from outside is pulled into AC (does not go into room), gets the heat from the air in the room, then is blown out as exhaust.
If you aren't sure, look for a diagram or in-depth explanation.
Ok, so there is a separate intake and output inside the house for the cold air.