i have similar bill as yours Mine around RM660, the lowest was RM450 if we use with concern.

and also staying in a double storey semi D.

my usage:
1.5hp york normal aircond = 10hrs a day
1hp york normal aircond = 5hrs a day
1hp york normal aircond = 10hrs a day
water boiler = standby all the time.. once reboil 2200w
1 ceiling fan always on 24/7
1 water pump for upper level = always on
1 water pump ground floor = always on
3 other aircond = seldom on

I realize what consuming electricity compare to my previous RM350condo bill

Setting of aircond in my master bedroom if difficult to reach the ideal temperature will force aircond work more and consuming more electricity.

Water boiler also taking lots of electricity.

My LED light only 7-11watt for standby

minimize usage of other downlight coz once turn on will automatically connected with 4 other light

PC also quite consuming.

light might look like small but if u realize once u switch on it will trigger 3 other light as well (unlike condo)

aircond will work harder to cooling bigger area

turn off pump if unnecessary

remind your maid to use aircond wisely

PS: GST in the bill already RM 50 easily!!