I plan to install 3 airconds for 3 rooms. 2 rooms with each size about 11" x 20" and living room about 22" x 30"?

Any brand and horse power recommendation ?

any brand? inverter or not? prefer save electricity 

okie thanks! actually only one of my bed room is frequently using air cond. the other one is more like guest room and we don't usually switch on air cond in living room as well unless got big crowd. so i assume ME inverter for the frequently used one and how about the bedroom + livingroom?

8 to 10 horsepower

My bedroom size is about 14'x18'
What is recommended HP?

thinking to buy inverter tyupe either samsung,Panasonic(Econavi) or Mitsubishi( Mr Slim)
Mitsubishi is the most expensive

If i choose 1.5HP, will it be any issue?
--> eg: extra current usage to cool down the room especially inverter type
I understand that 1.5hp might not sufficient to cool down the whole room
My thinking is as long as bed area is cool, it is ok for me

Attached is my bedroom plan drawing

Face wall means that bed head facing air cond wall is it?
My concern on HP1.5 is that even though bed area already cool but compressor still work hard to cool the entire room.
On other words, it can't reach desired/setting temperature
Thus extra work out for compressor lead to extra current usage even though i choose inverter type
Would like to know whether my concern is correct?

HP2.0 too expensive though

Samsung very noisy one la the outdoor

Already double the1/2 hp aircon electricity cost. I am still looking 1/2 hp inverter.hahaha.. now still using kdk fan though

Allergic from child and had asthma. Lucky ate bat and swimming so become better. Just every morning got humid in my nose

24hours on air con will make u sick .... there why there is something called fan

then u r actually contradicting to ur statement ... u said fan is outdated and yet u said open air con 24hours is not good for ur health , which is common sense   

which ME inverter aircon is good and the latest now? 1HP, 1.5HP and 2.5HP. thanks

why skip 2hp aircond? mind to share? im completely blur in this

Installed the Triangle Samsung virus doctor inverter during room reno and yest is the first night using it.

I noticed the coldness not as great as some non-inverter aircon but the air not as dry as others non-inverter. This is the first aircon which didn't dry up my skin and throat during the night.

The compressor is very silent... maybe still new la

The only irritating thing is the LED screen which displays the temp quite bright during the night. If switch on the virus doctor function, there's blue strip of light on the vent which is even brighter. It look cool during non sleep time but a bit too bright when switch off room lighting for sleeping time.

Will comment more when uses more 

I don't give a damn on this rating, if want to compare the rating in proper manner, do look at the sticker on the air conds you want to compare.
Usually Panasonic's rating are more accurate comparing to other brands.
You need to consider all the factors before concluding that 5 star.

Oh yah, forgot to mention, Kimchi brands are quite blur on stating the power

Well, the seller that selling electric appliances also never bother to hard sell me any of the Kimchi brands, but he will ask me to choose the Japs brands.

A known seller and installer's mouth are the most honest.
And with repairer to verify.
The most easiest parts to get is Daikin, follow by Japs brand. Kimchi is hard to get.
You have money and time to waste, but I don't have.

Triangle or non-triangle? Could be old inventory to clear esp non-triangle. If they are fit for purpose and you are aware of their limitations and their maintenance cost (like filter replacement if any) like what I mention above and take steps to mitigate them worth the risk to try.

For me, I would record down the model, check for reviews online, inquire about spare parts (cost of filters which needs m month or n years to replace and PCB) and weigh the turnaround wrt to sushi support in the area. If acceptable, check manual for any special installation requirements* and then get an installer to do as instructed in the manual.

* at least three I can think of:
1. Generous clearance for ventilation like 300mm(12") from back of wall or from the ceiling if under the roof or balcony esp. If that can be met, no reason why it can't be used.
2. Loop the refrigerant pipes one round behind the compressor to avoid excessive vibration etc. (Samsung or LG manuals have these illustration very prominent across their different models)
3. Data/signal wiring to prepare beforehand for indoor to outdoor unit. Samsung seems to use two in addition to default three (LNE=live neutral earth).  So MCB---LNE---indoor/blower---LNE+2data---outdoor/compressor (confirm w manual specific to model)

Plus one crucial thing that only a minority does here (but mandatory all across in SG): use Smartco Paircoil or Inaba Denko Paircoil pipes. kimsim, you might want to take a picture of the piping insulation sleeves and show here of your AC installation.