My garage has an AC, which is never used (its so wasteful to heat and cool the room! prefer just to put on a fan)
Thinking that if i install a unit like this, i can break this in to two separate 20 amps circuits for outlets, or use the AC if i feel the need.
https://www.amazon.ca/Baomain-Universal.../dp/B08HWM7CMR/
I actually installed that selector in my travel trailer and it works fine. I'm just not sure if your situation requires that. What kind of outlet is your A/C hooked in to?
i looked into it more, its not going to work for me. I have 2 hot wires and a ground so no neutral to pass through to switch the 240 volt into 2 120 volt plugs.
If you don't plan on using the AC unit anymore, just convert one of the hots into a neutral (mark both ends with white tape) . You'll need to switch to a single pole breaker though.