Thank's Terumo for your reply, appreciate it !
check with u couple things again if u dun mind
1. what's need to be concerns during the aircon replacement ? since i never deal with GC and totally blur for this kind of things(installment/replacement).
2. abt the false ceiling again, There's certain part of existing piping is under false ceiling(very short distance ones), iz it a must to cut the false ceiling to take out existing trunking and install new trunking ? or can use existing trunking inside the false ceiling to put new piping and no need to cut it at all ? i worried would be messy if need to cut the false ceilingYou .
3. Cooper upgrade from 23 to 22 and insulator armflx upgrade to 1/2", u said "good to have", does it meant 23 good enough for R410 ? so can save cost rather than use 22.
4. Peace of mind extended warranty for 4 years at $99, i'm not yet read the t n c(dunno where to find also), the sales guy just said peace of mind only, did u or anyone ever had experience with this kind of things prev with GC ?