There needs to be a description either in the skill tree/recipe tree or when placing them.
We're told what the fan does in the little tutorial, but I have no idea what the other ambient items do. I have two of them in my shop because they look nice (the gardening and carpenter ones), and I still don't know what effect they have.
I'd also like to suggest that they either don't need a press-and-hold button to turn on (so, just a one-click), or they stay on for the entire duration of a shop day. When there aren't many customers in the beginning, the duration isn't a problem; but as the store gets bigger, I often have to turn them back on at least twice.
That's in addition to sweeping up the footprints and running back and forth from the counter; now you have to run around your shop and lose time by holding down a button to slowly turn these back on.