Thanks for the detailed answer, if I were to get a 240v circuit how many miners would I be able to have on it? And what kind of cooling would I need for 2 L3+'s?
One miner would need ~4 amps on 240V, so if you get a 20 amp 240V circuit - 3 miners at least, maybe 4.
Cooling depends on your climate mostly. Don't waste money on A/C unless you're somewhere like Arizona. Just venting the room (window fan perhaps?) may be sufficient.