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Comment by adrianmonk | Hacker News Reader

Someone ought to make a reverse window unit. It would be like a regular one but hanging inward instead so it doesn't protrude. Supporting the weight might be a challenge but solvable with some legs or maybe angle brackets.

Of course it would take up more space and be louder than a regular window unit, but at least it wouldn't require hoses. Plus it could drip condensation out the window through a short tube.

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The whole point of a window unit is that the very hot compressor is outside the room you're heating. Without that, you may as well get a portable unit.

That's not a insurmountable problem using a bit of insulation and careful design.

Still just inventing a portable unit at that point.

But one without hoses, with less heat dump into the room, and alternative mounting.

Midea has a u-shaped unit that won some awards.

The compressor and radiator are outside. A section a couple inches tall contains the pipes, wiring, and braces. The fan, blower, filter and thermostat are in the front bit. Your window panes (hopefully double glazed or better?) and a couple inches of foam provide the sound dampening. The lowest displacement model claims 47dB with the fan and compressor at full bore.

the compressor makes heat in addition to being loud. Thats the other strike against portable AC units. The compressor is heating up in the room you want to cool

These exist, usually an off the shelf through-wall AC unit with custom built sleeve and legs. You can see them (or not see them) in some of the landmark pre-war buildings with strict facade rules.

Thanks. Today I learned that window ACs and wall ACs are different things even though they look extremely similar.

For anyone reading this, presumably because windows are thin and walls are thick, window ACs are expected to stick out and thus have vents on the sides, whereas wall ACs have vents only on the back surface.

So as long as you figure out drainage (so condensation doesn't just land on the windowsill), you can install a wall AC in a window and have it not protrude.

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