Jul, think better to install one first. Alternatively, there's one called system 4, that means living and bedrooms using 1 compressor, less powerful, coz if u on the living rm one, u better not on the bed room one at the same time. That was why we chose 2 seperate compressors.. more power, but in the end, realise we seldom use the living rm one leh.. heheh.. mine costs ard 4k.