Butters> abit confusing. I hv aircon ledge. Outside my MBR. But window very small. Duno whether possible to put extra bracket or not. How abt piping issue? i heard that the e existing piping may have to undo. Also, the piping may have difficulty to conceal in the other room, thus will be v ugly and spoil the whole renovated area...is it true? Sianz, if v complicated, we may opt back to System 4 again.