I regret not getting clearer pictures to zoom in and see the words on the instruments but I felt the need to be discreet as I was just walking by, these ocean-front home garages are rarely/NEVER left open unattended. What is this mystery chamber?
One more different angle picture in the comments, you can see the seating bench in the chamber.
Apparently they do their laundry in the garage?! In that garage?
Edit: my comment is based on OP’s second picture, in the comments. Also, they do laundry at all?!