slmkhoo:atrecord:Btw, old HDB flats could only support aircon systems of a certain capacity, so maybe simkhoo had that problem too. The Daikin I have in my 4-rm HDB is a 4+1 split. It was the only model we could install in 2000 when aircon installation required permit to be approved by HDB. It is i think a 28,000 BTU system, but the 3 room units were 9,000 BTU each, and the living room one was 15,000 BTU. So max it can cool is either 3 rooms together, or living plus 1 room. Beyond that, can switch on, but not cool... But the 29-yo flat just gone through upgrading works which include electrical upgrading. I think now can support bigger-capacity units that can cool more area/rooms together.Hope this helps...Thanks! Yes, I do now recall that there were limits on the size of aircon we could install in 1999. Our flat is too new to be upgraded, so does that mean that we are still subject to those limits?my frd just did his reno,heard it was her aircon contractor did everything for her-found out if permit required fr. town council/hdb(can't remember)for aircon installation,recommended n installed aircon....i think an experience aircon contractor will able to help u.