In trader_4 writes:

Why not buy a 240v unit so you don't have to rework/run new wires?

That's probably the cheapest and easiest solution. As others have said,
if it's a straight 240V circuit, no neutral, it would take changing the
breaker to convert it to 120V.

The costs of having an electrician (depending on your
area, of course) setting up a 120V outlet and then
getting a commodity 120V unit is probably, once everything
is totaled up, is likely to be about the same as getting
the 240V unit.

At least in the US...

120V air conditioners are commodity, highly competive,
and pretty low priced (in comparison...). Also readily
available at second hand outfits like Habitat,
Goodwill, and the like.

240V units are targetted more to the commercial market,
may (or may not!) be better quality, but are certainly
going to be more expensive....


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