when was 12,000 btu used with 240?....unless it offered heat
a regular 120 volt outlet was all that was needed for sizes up to 12,000.....later on your could find 14,000 and 15,000....
anything above that in BTU's had to go to a 240 on a dedicated double 30 amp circuit
for a true CHILLED COLD A/C, you want to pick one with a low EER value, the higher the number, the warmer the air output...EER is not a better built unit, all it means is you can't turn down the thermostat as low as older units...
a simple allen wrench on the back of the thermostat will change it back to a deep freeze....
that's why I prefer non digital models....