do you already have an aircon installed? how's the cooling? that should give you an idea of what you need.
if cooling comfort is the objective, i recommend the bigger unit.
the smaller aircon might spend all its time, trying to cool the room. it might still consume less electricity, by virtue of its smaller motors, but it might not succeed enough in the cooling-the-room part.
if your place is commercial, with lotsa door openings and traffic, get the biggest you can get your hands on. it would be very difficult to adequately cool your place and the rest of the world outside it.
those store or factory estimates, are usually for private dwellings.
if your room is directly hit by sunlight, get the bigger (biggest?) aircon.
it is much easier to fit in a smaller aircon in a big hole, than a big aircon, in a small hole.





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