I asked the person how come dont have screw on it, he said he installed few hundred unit like this and nth happen. Then ask back me "Why other ppl nth happen but u wan to do it?" and keep said the floor that put the outdoor unit cannot put screw, need mounting. I tell him its about safety and even the mounting also mount at floor or wall, any different on that?!

then he said "want screw can, need to add rm 30 for the screw". then at the end he said "need add rm 30 wor, u got the money mah??!!"... i was like WTF, i am the unit owner!~ so i just hang up and gonna find someone else to help me done that. 

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Added on September 16, 2011, 7:17 pmAnd another problem is the aircond piping. My room have pre-installed aircond piping where i dont know its original from the unit or installed by the ex-owner. I always hear water dripping inside the wall whenever the aircond is on, not really sure is it the sound between water and pipe or the sound between water and wall..