this post was submitted on 15 May 2025
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They're also monstrously inefficient compared to mini splits even before you account for leaving a giant uninsulated hole in your wall with free movement of air between the inside and the outside.
I laugh every time I see one of these shoved in right below a brand new quadruple pane low-e argon filled latest ultra efficiency mega R value vinyl window. Yeah, the window is not where your air leak is, bro.
There shouldn't be free movement of air with one of these. That defeats the whole purpose of it. If there's actually airflow across, someone fucked up the installation.
Though, yeah, it's not the most efficient setup. The only thing worse is a portable ac with a single vent hose.
Most of the PTAC units I've looked at in hotel rooms have had daylight visible right through them. And I can tell you from personal experience that the GE ZoneLine machines don't even have the hot and cold sides insulated from each other, nor the outside world. There's just a poxy plastic partition behind the blower wheel that's got all holes in it for mounting various components, and since this slides out with the chassis this doesn't seal against the inside of the sleeve in any way and usually leaves about a 1/4" gap around the top and sides. Maybe there's some kind of boundary formed by air pressure when the thing is running, but when it's off it absolutely allows outside air into the room without much hindrance. That's before you get into fitment of whatever current unit is installed in the old-ass sleeve in the wall.
Even your $99 Walmart window unit has a big polystyrene block insulating the evaporator side from the condenser side (and thus also the outside).