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For my living/dining room (pic below - circled in yellow )
Should I go for :
1) 2 x 9,000 btu, or
2) 1 x 9,000 btu and 1 x 12,000 btu, or
3) 1 x 18,000 btu (single split) ?
2 x 9k (on wall surface 1 and 2) better if you want fast cooling. no need 9k plus 12k as it is similar to room size.
single 18k will take longer time to cool the furthest corner unless you install a fan to help circulate.
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