bro....

that RM1080 is for air-con only...
not inclusive of installation...
coz mine...everything related to installation is done by my renovation contractor.....

if i'm not mistaken...
if include installation...
it shud be somewhere around RM1.2k
but still....
even though we got that price...
the actual cost will depends on the location of ur air-con to be installed at you hall or room...
the further it is from the compressor's location...
the more the copper cable needed...
and the cost will increase for sure...

i think your RM1.3k is inclusive of 10ft copper cable only...
which means that distance from ur air-con unit and compressor is max 10ft
if more than that...they will charge u per additional ft required....

gd luck