this might indicate much higher a/c consumption than before due to lack of insulation. try to meter your regular usage for a week as suggested and then try (if you can tahan) one week without any a/c. compare the figures to find out your a/c portion of the bill.

1200 units is a lot. i a/c 24/7 (but insulated very well) and use all appliances (washing machine, dishwasher, pc, fridges, tv, etc etc.) in approx. 9 units per day per 1000 sqft living space (ceiling height is 12 ft). thats an average for hot/cold season over a couple of years. but this is running all on as energy efficient appliances as i can find (LED lights, inverter a/c, AAA+ or higher rating). if you calculate the volume of your house (and maybe the old) you can also get an estimation of how much A/C you probably need by default. then the lack of shading etc. will greatly increase concumption too.

then at least do it for a day when its not too hot and not too cold so you can an estimate. there is no way around if you really want to know. alternative you can buy voltmeter(s) to plug between the power points and gather data. if you want consumption to go down or find the culprit you need to be willing to search for it.

calculate the volume of the house is easy:

ceiling height x widh x space of each room in sqft gives cubic feet. you only need to do this for the rooms that you are airconditioning at the moment. open door = adjoining room is also aironditioned.

then you do the same for the old place. see how much volume difference you have. this will already give you an idea. for the lack of shading etc. you can possibly also expect that the power needed to cool down to the same temperature caneasily be anywhere between 10-30% more consumption.

i am pretty sure its the A/C thats causing the pain.

forgot to double check with you:

Electrolux clothes dryer = +/-6 hours a week
Rubine brand built in oven which I use +/-5 hours a week
Deep oil fryer (no brand) which I use +/- 1 hour a day

those (same) items you used roughly the same in the old house right?

The main issue what is the actual temperature are you setting now?

Also how big the room size with the right Aircon now?
Just simple list here

1HP for 250 sqft is way small leh.

Seriously 250 sq ft = 4.5x 5m wide the right Aircon Hp should be on 1.5hp at least, otherwise may runs non stop.

Cause under size hp

ok first of you have rooms which are roughly 20% larger. hence for the same temperature you need factoring in other factors mentioned about 30-40% more cooling power. but the inverter is set to 26° vs. 21° on non-inverter which should totally offset this.

250sqft is no problem for a 1HP aircon if the place is not super-badly insultated. are the rooms under the ceiling (how hot is the ceiling)? this might be a problem. windows - do they leak air a lot?

put a power meter between each a/c to see daily consumption to pinpoint. it could be a/c problem (running full force for whatever reason), too much heat from ceiling or walls, bad insulation or all. the other things wont contribute much to justify 40 units a day. i would guesstimate (!!) 10-15, tops 20 units go to ur non-A/C appliances. the rest is A/C.

Ok talk with Aircon for single unit won't cost you more than 300 kWh per monthly, I guess you have others heavy input watt thing or either used too many time of water boiler

night time running and temperature setting of 26 deg C..
i am pretty sure the AC can reach the set temperature and the compressor will reduce speed to save power.
the fan speed of the AC will not consume much electricity.
the main thing is the compressor, but even at 80% running, it'll be around 640W x 10 hours?
6.4kWh.. x 0.5 cents x 30 = RM 96..
try sleeping with your kids 1 night and see read the meter again in the morning!

Normal use for 1hp inverter York or Daikin should be around 750w to max 1000w

If let said from 1kw x 8 hrs x 30 = 240kwh for one unit only.

X 3 units = 720kwh

Lowest fan compressor still running and try cooling the room to the set temperature.  For Argument sake, even if you run 12 hours at 100% capacity of your a/c, it will cost you roughly 300 units. that mean you will be paying RM 150 only.

Ya correct my kampong York inverter 1hp is around 735w to 900w Max only, but my mother in law they never complain the bill is expansive

I guess just less than Rm200 only

can anybody help me find out what is my hitachi RWB560P2M power consumption in watts?
i remember got one singapore gov website that list the star ratings etc but now can't find already - http://www.nea.gov.sg/home

You can see from the picture, it does state outdoor rated power in the label.

Indoor blower won't consume too much electricity one as it is just like a fan the blowing the cool air out only.

You need to take the daily consumption by variable the usage of appliance to find the which consume the most.
Alternatively, can get a clamp meter to measure the current intake by each appliance by clamping on the incoming wire, which is quite convenience as well.

Can see it in kampong too


Just stop them used electric water boiler for cooking water very often and also vacuum cleaner can be cost you more energy also.

Normal vacuum cleaner can be 2500-3000w easily

The clamp is not a "clamp", just need the wire to pass through the clamp hole only.

You don't need to have exposed naked wire to measure the current.
Clamp at wrong wire won't get electrocuted, just get wrong reading only.

You can google what is "clamp meter".

Having said that if not technical savy enough, then better don't touch any wire.

Yes 5 ticks is greater

Seem like only for night time already clock on 26kwh, then include day time.

Your night energy don't add up leh? if you have 1hp inverter x 2 unit switch on 9 hours each. Assuming you running 100% full blast, say 800watt / hours. Is 800watt x 2 x 9 = 14,400 Watt Hour. round up to 15Kwh.

Where your 9 KWH go?
01) {vacuum} Say 0.5 hour x 2.8 KW = 1.4Kwh
02) 10mins x 3,000 watt water heater = 1/6 x 3,000 watt = 0.5 Kwh

Others are small items.

- You sure you running 1HP inverter and not 2HP inverter?
- Anyone stealing your electric?

Something very fishy, maybe after 10pm, you monitor every hour how many units you use till 12-1am.

You may want to trip the remaining mcb to make sure no one stealing your house electric.

If nothing seem to solve this, can request tnb to check the meter or change to a new meter.