Usually electric shop can help you to order, place some money will do.

I don't know why people like to buy from those chain stores. Usually more expensive. Try those smaller shops. I in Seremban but you are in KL, so the transportation fees are quite high.
But then 2HP are more than enough for hall.

Under regulation wise, you should be upgrading to 3 phase. If this is new house and insurance won't cover when something bad happens.
Anyway, 2.5HP won't really save much, unless you turn it on for long period of time.
Before I get my 2HP, the shopper even advise me to get 2HP instead of 2.5. It is about rm500 cheaper and installtion fees also slightly cheaper.

Is their regulation, single phase only allow 2 1HP air cond, if follow the book.
Anyway, if all the high power consumption appliance are taking from main fuse box, then it won't have so much problem.

I'm currently using single phase, not intending to upgrade. Even price to turn into 3phase isn't that expensive, after consulted its actually less than rm1k. The cable pole is next after my Neighbour unit, it isn't underground.
I have 5 non-inverter airconds, 2x 2.5hp, 1x 1.5hp and 2x 1.0hp. I'm running max 3 airconds at any point of time (even on both 2.5hp). I was told its safe and manageable by my unit's load, after calculation. However I test to have all 5 on at one go, during installation. It has no problem at all. Btw I have 1 600l fridge only.
Just make sure the wireman knows what they are doing. They should recommend proper wire size and DB box distribution. Many times those 3 phase are over-kill... Unless users need to operate all airconds at any point of time (more than 3, perhaps).
Almost all new houses are coming with 3phase ready. But don't think 2x 1.0hp airconds need that, yet.

You are right in some sense. 3 phase are more on load balancing. If run few air conds together for long period of time, then 3 phase wiring will be better.
Have to know that, when the wire are hotter, the efficiency will drop. But again, how low is low?
Even sometimes the 3 phase wireman only wire it using 1 phase and happen all the time.
For my double storey house, 1st floor are using its independent phase, so when ground floor's ELCB trips, 1st floor still got supply.

So I guess I will buy the panasonic inverter type then. Can anyone/user elaborate the pros and cons of it?

Looking for 2HP a/c. Anyone got the latest pricing from D'Legend or any promo running around?

Thanks.

Anyway in the markets brand have a lots..

I would prefer for mitsubishi electric inveter unit