If you are about to purchase a window unit, the answer depends on a few factors:
110/115/120 volt units are generally not available in the larger cooling capacity sizes. If you need to cool one average sized bedroom and have a 110 outlet near a window, this should do the trick, and you won't need an electrician to install new wires.
If you need to cool an entire house, then you are going to need a 220/240 volt unit or multiple 110 volt units.
If you are talking about a central system, then the furnas, or indoor section will most likely be 110 volt and the outdoor unit 220 and you will need to have it professionally installed anyway.
yes
If it is a 240 volt conditioner it will stop. If it is a 120 volt conditioner it will stop if it is on the leg that has been lost.
That depends on the size and application of the unit. An automotive system runs off of 12 volts. In the USA, a household unit is 110 or 220 volt.
No, the RPMs of the motor will be wrong and the compressor will be damaged.
Yes the 115 volts you read is just the maximum it will handle.
The wire sizing of any equipment is related to the amperage that the equipment draws. Look on the air conditioner and restate the question and give the amps that the unit uses and at what voltage.
Yes. The 220 volt AC unit pulls more energy then a 110 volt. It basically draws double the power. It needs more elctricity to power it's internal componants.
15000btu is the largest and that's a 115 volt basically the same ,you just need a higher breaker is all
They are both energy efficient units if they are of the newer thermostatically controlled units, generally a 220 volt system may draw less amps while setting on a lower temp range but again you should be able to view its electrical values at the time of shopping for one, ask for the efficiency rating charts for each unit.
My electrician says no, has to be some rewiring.
Does this air conditioner require 220 volts?
It blows air at how many volts it was designed for... an automotive unit will be 12 volts, heavy equipment uses 24 volts, a window unit in N. America will run 110 volts, while 220 and 440 volt systems are typically heavier household and industrial units.