It’s a wall furnace in the center of the apartment, I guess it blows via convection, outward on both sides of the wall. These heaters are super common in Calif

It’s a wall furnace in the center of the apartment, I guess it blows via convection, outward on both sides of the wall. These heaters are super common in California, and some larger homes have multiple of them. I assume they’re not as efficient as more modern solutions, but they are certainly reliable and low-maintenance.