U'll see savings IF u set ~>25C above. if u constantly set <22C or below, it is as good as non inverter

Here my actual experience. First aircon is panasonic non inverter 1hp using 8hr for sleep. Bill average rm110. Run  about 8-9yrs before it finally spoil.

Replace a new Panasonic inverter 1.5hp. Same usage. Bill cost me average rm70. Already running 5yrs till now.

First yrs already get back my return compare non inverter. Base on the last time bill and current bill. 5yrs now I already save rm2400. The save Can use for service the aircon many many time.

No matter how many hr using, it still save. Long or short. Sometime I find you guy are very slow to adopt the technology which is already more than 10yrs old. And still undecided it now. 

Guys how many HP air con is recommended for a 300+/- studio?

For a room with 12.4ft x 14.7ft, with 9ft height. How do you calculate that and what HP needed for this?

For a hall, since it's kitchen open concept together with living room. It's 29ft x 14ft, with 9ft high ceiling(includes kitchen). what HP is needed for this?

Am thinking to get inverter since if the aircond HP is big enough then it will save electricity. right? (coz of more start/stop)

Thanks for helping. The living room measurement given has already included the kitchen space as well. So, just stick to 2.5HP non-inverter?

so for the room itself, 1.5 non-inverter is good enough which will help on saving electricity?

May I know how did u calc to get the btu? what's the btu for both my room and living room?

Any suggested brand for 2.5HP non-inverter and 1.5 inverter?

If your a/c rated 13.5k btu, and your house need 13k btu that mean your ac may need to work at Max power to retain the room cooling. Better get bigger size.

* brand - PANASONIC
* model - CS-S18PKH
* HP - 2.0 HP
* type non inverter or inverter - INVERTER
* price - RM2590
* EER - 12.2

Just to share, my recent electrical bill is only RM44 previous bill without ac was RM37

Aircond : Daikin Inverter 1 H.P
Temp setting : 27C
Average usage per day 8 hours.

Hope this data will help you deciding your aircond type. As off now i can say that inverter really saves energy.

previous bill without aircond, usually rm50..

then pasang aircond, 1.5hp panasonic inverter deluxe, temp setting 16~24C, 5hours per day.

this month bill rm73. lol.. rm23 increase.

bill for raya will be 100+ then. cause we turn on the air cond for 15hours per day..

Now I headache about this too. Inverter or non inverter? Yesterday I heard inverter air conditioning need use 8 hrs per day if not wont save money too. Somemore service expensive than std model. The boss told me fridge & washing machine should buy inverter. What you guys think? Is it true?

Pay now save later or save now waste later ?

It depends on your room condition, if the room is not "air-tight" enough, and not proper heat insulated,
using inverter won't save you much over the non-inverter.

As in full blown situation, aka the motor running at 100% time, the difference between inverter vs non-inverter is not noticeable.

Inverter saving comes from ability to run at motor at variable speed, aka the motor can run at 25%, 50%, 75% as compared non-inverter that either run at 0% or 100% only.

Folks a few things to consider about Aircon.

1) You will save 20% Every 1deg C you set AC control above 20degC.
ie if you set to 23degC will cost you about 50% less (0.8x0.8x0.8 = 0.512).

2) It will cost you 20% more for every 1degC you set below 20deg.
ie if set to 16degC will cost you about  double (1.2x1.2x.2x1.2= 2.07)

3) Studies have shown 23degC is most comfortable temperature for most people, provided there is air movement.
Ie install a ceiling fan or wall fan to create air movement in addition to that from the AC, and you only need to set your AC to 23degC and feels like 20degC.

4) The better the room is sealed and insulated the less power required for AC.
ie install seals at door bottoms (cool air is heavier and rushes out under doors), make sure windows have rubber seals and are well fitting.
If the outside of any wall is facing the sun during the day try to shade this wall with plants or awnings, otherwise this "hot wall" will transfer a lot of heat inside and AC spend most of its energy trying to cool this wall.
Similarly you can reduce heat transfer through windows dring the day by using external plants/awnings/louvers or internally by using solar window film or block out blinds/curtains.

5) Inverter AC will usually pay for its slightly higher cost (vs non-inverter) within 1-3 yrs (depending on usage) through lower electricity bills.

6) Assuming 8hrs running per day, it will cost about RM70/month for each HP  AC used. But about about 20% less with inverter.
eg if you have 2 x 1 HP and 1 x 2 Hp and they are running *hrs each day it will cost you (2x1 + 1 x2) x 70 = 4x70 = RM280/month non-inverters, OR RM224 with inverters, saving about RM56/month.

Cheers

Its running for 10 hrs and using 10kW, ie 1 kw/Hr.

1.5 Hp is 1.125kW (1HP = 0.75 kW approx) so from that I could say your AC is running at about 90% of max rated capacity, which seems high to me for such a small room. I would have expected a figure closer to 60-70%.

I suggest you check for air leakages at windows and under/around doors.

BTW I'm assuming the door is closed otherwise your actually cooling the rest of your house.

Also it should be noted ensuite bathrooms can be a escape route for cooled air, so that door should also be closed and well sealed under and around.

An easy and effective way to test for leakages is to go to the other side of the door/window and put your face cheek or back of hand near the door and feel for cold air drafts. Those drafts are money pouring away.

Cheers

that seems very high bro

my bedroom is 21' X 15' X H10'.
just installed Daikin R22 Inverter 1.5HP
Air con on for 10 hours 8.30pm to 6.30am
8.30pm to midnight got on Plasma TV, a light or two, PC.
no water heater
no fridge

use about 6kWh only. i checked for several days - its around there.
oh my temp I set 25C

Last nite I set to 26C because rainy nite, the usage was dramatically reduced to 3kWH

If my bedroom is around 13'6" X 24' X H10, is 1.5hp enough?

I m using the same brand and capacity aircon as you.

Average monthly bill is 290kwh or 290 x 12/365 = 9.53kwh/day. Fridge using 1.5kwh/day. Other like light, AV, server, pc, heater and cooker, probably ~1kwh or more. So after minus out 9.53-1.5-1 = 7kwh/day.

So the 1.5hp inverter pana consume average 7kwh/day. Room size about 168'sq or 1600cubic. 11pm - 7am and set at 24-25c.