Take the box off the wall.
No indoor unit, no vents, no pipe across the wall.
The water comes down inside the wall and joins the panel at one fitting.
What is left on the wall
The same panel heats the room in winter and cools it in summer.
The heat pump that does the work, compressor and all, sits outside.
Indoors there is no fan, so nothing hums at night. The only thing on the wall is the panel.
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