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Depends on conditions, size of space, and noise tolerance.
Lower BTU units are generally quieter.
Have to account for floor area, ceiling height, how much sun the room gets, how well sealed/insulated the space is, heat-generating devices (computers, TVs, fridges, etc)
If it’s a 225 sq ft, well-shaded, lower floor, well-insulated room with 8’ ceilings, an 8k or 10k unit is more than adequate, for example.
A 400 sq ft room with 10’ ceilings facing south on the 10th floor of a condo building is going to need significantly more cooling capacity as another example.
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