Depende sa installers pero yung nakuha ko malinis naman gumawa. They drill holes in the wall for the mounting plate ng indoor unit then another hole through the wall about as wide as a coffee mug's mouth for the copper tube, wirings and drain pipe. After every step someone else is on standby with a rag and broom to clean up.
They unpack the indoor unit from the box then use the empty box to catch the bits of cement as they make multiple small holes to create the bigger hole. Of course there'll be some fine dust that will float around but I think you could set up some sort of curtain around the work area to further contain the debris. Or just cover everything with old blankets or plastic covers to lessen the surfaces that you'd have to wipe down. Kung may vacuum cleaner, saglit lang ang paglinis.



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