These 4 and 6 k/month bills, are they joints with own aircon or are you paying Empower/Palm Cooling as well? My DEWA was 900 chips last month but I pay about 1100 in Empower as well. 2 kids and a maid, 4+1 apartment. I don't pay housing fee on my bill however. Do you run the A/C 24/7 with the doors open or something?