This is a new product category in 2024. It combines a window unit A/C with a heat pump, in a form factor that's very different from before.
The benefit of a heat pump is that they're efficient and will save electricity compared to a regular A/C. They're so efficient that they have a role to play in tackling climate change.
Here's the products that are available on Amazon now. Only pay attention to the ones that describe themselves as "U-shaped".
A Wired article about their huge benefits.