You need to find out the size of the unit.
Rule of thumb - for every 600 sq ft of cooling area (in a well insulated house) you will need 1 ton of air conditioning. 1 ton = 12000 btu.
So, if your cooling area is 600 sq ft you would need an AC which was rated at 12000 btu, assuming your house is well insulated.
If it is not insulated well - you might need a bigger unit, i.e. 15000 btu.
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