This is how my subpanel looks like. I am looking to install a breaker for an AC unit. 20A. The only caveat is that this has to be 240V. This is a subpanel coming from the main one. There is a breaker of 60A of capacity so I think it should be alright from the load sense, assuming that it supports drawing 240V from it. Any information or pointers are appreciated.
The feeder wire has a black, a red, a white, and a green so this suggests there are both legs present, i.e., 240 V is present.
There appears to be a double space on the right open for a 2-pole breaker. A 60 A feeder breaker should support the addition of a 2-pole 20 A load depending on the actual loads on the other circuits in this sub-panel.