I will be receiving my new house key this june and not yet renovate, is it economical in a long term if i install inverter AC even at the moment my plan is not to use AC frequently > 6 hours?

Piping for inverter AC is different from normal one, correct? 

1. Use combination of air cond and fan, faster cooling, best location is the place you will gather the most.
3. Installing air cond are not primary concern during renovation, what important is getting the location of air cond and making the holes are more important. This will bring down the air cond installation cost later on and avoiding later hacking jobs that creating another round of mess. Also, always avoid concealing piping.
Always remember this : inverter air cond does not save power if it is on full blast/full output. Always read the full technical specs of each air cond you are going to buy.
When your room are still warm, all air conds will gives full output which inverter are higher than non inverter at this state.

Just ignore the troll. I see nothing basically, since I'm using the ignore button.
For a keyboard warrior, he has to pick a beef inside a chicken egg. I'm used to it already.
When I'm talking on full load, he will use minimum load to attack me.

Want to ask sifu here master bedroom around 250ft , what HP AC I should buy ?

Thx sifu
Currently using 1hp aircond night only.. Sometime few cold sometimes not cold .. The room facing west..

What AC are you using and how old is it? Facing west you might need to switch on your AC earlier to take out initial heat load from the sun.
Your room using full high windows? Did the curtain always closed.?

still confius.....
isn't the inverter is better than non inverter....
u said the inverter using more power when run full power....
the other said not......
             

First a technical reply that makes sense..

ok.. your AC clamp meter measures RMS AC current which isn't the proper way to measure inrush current i.e. ac motor starting amps..

Please watch this https://www.youtube.com/watch?v=-rM2EtkXCbE  its a youtube video by mjlorton..

I've watched it and do not pretend to understand his whole technical explanation but the gist of it is an ac motor inrush current* cannot be measured with a hall effect type clamp meter (the basic clamp meter we all know and love) which can only measure AC RMS amps

rather you need to have an oscilloscope to capture/record/playback  the dc and ac inrush current form as basically he says this is where the 6x to 10x inrush current is present.. It's almost an instantaneous current spike at the peak of your ac sinosoidal voltage .. mmm.. maybe getting too technical here ..

basically he captures the inrush at above 22amps with 4amps being the run current..

but anyway have a look at the video and see if you can agree..

As a side note the EER of an inverter type motor will always be higher than a typical DOL start/stop as the input power gets lost as heat during the start/stop stage..

An inverter circuit bypasses this with its ability to control the frequency/voltage i.e. starting motor starting torque thus variable speed drive of the motor..

On any motor controlled via a thermocouple sensor (like your ac unit) having an inverter circuit is a no brainer as it pays for itself very quickly as we live in a hot humid country..

edit* typed motor when it should be current

Nope, in terms of reliability, inverter are poorer due to circuit board fails.
As said already, inverter only do wonders when it is running on ramp down or reduced output mode, as long as you don't reach this state, it will be worst than non inverter.
For typical setting, comfort level will be 24-26°C, then you have to see your initial room temperature, if 30°C and high humidity of > 70%, it will take longer time as the air cond needs to remove moisture in your room and at the same time bring down temperature.
So the question will be, how long it needs to bring down the 4°C. This won't have absolute answer. So room needs 3 hours, some needs 5 hours.

1st time in my life heard of air cond motor, another troller that know 0 basic but try to troll and baseless personal attacks
Also, if running on low load and full load has no relevance, then why the power consumption they are putting a range for it? Again, by your statement, it still proves you know nuts on how an air cond works.
And just to slap your self with your limited knowledge, for the same HP air cond, inverter are drawing 3.6A while non inverter drawing 3.7A, but I do understand what you are trying to say 0.1A are still lower
And I do like to know what does wasting heat means? Did you actually did temperature measurement and compare? But looking at the way you reply, you never but jus simply spit out

I don't know how you come out with 30% of savings when using inverter, care to explain in detail?

Any proof to support your baseless statement that when inverter running on full load save more power compare to non inverter?
You may choose different brand to justify your baseless flaws if you want. But when I checked on Panasonic website, it states clearly your flaw is a flaw

Well, he is just another baseless TCC only, that's why he don't dare to explain in detail. As by logic, cooling a room's temperature down 1°C needs at least 1 hour, still have to consider that's room's hardware setup which I'm pretty your room won't be same as mine.
Like before I install a door to make my room smaller, it takes 4 hours to cool my room. But after install that door, it takes 3 hours.

Well, I also having hard time to find how the test being done. But by taking the numbers on the label, back calculating is ~4 units used a day. The question is, are we really getting 4 units only by following our setting?
Most of the time the test temperature would be 23-26°C.
Just check out on Panasonic's website, they only publish outdoor temperature and not the room temperature. I feel this is quite misleading.

Well, you are a troll supporting another troll, so by using wrong term is still ok, I know that.
Even installer will not say air cond motor, but either compressor motor for outdoor unit  or fan motor for indoor unit.
The label means nothing.
That's after I busted your lies openly, only you change now as others also see you are bullshitting only.
But your knowledge still limited, come back and do personal attacks only.
Again, you with intention and purposely missed out my second statement, I know you are still trying your best to troll, but you still need to do more to get to your goal
Well, Panasonic website are very big, but comparing 2 air conds need 6 clicks only. But you again choose not to, instead, try to troll again.
According to JIS-C-9612 standard or like another joker's ambient room's temperature don't dare to mention, set 28°C and keep on boasting how superior his inverter are. Does it means anything? It does not. Is your room built according to JIS-C-9612 standard? But I know you will say yes, but how many people in this world will built according to those test standard? If you are playing the diplomatic game, do get another troll to support you, since 2-1, 2 wins. That's the beauty of forums, more people can twist a fact

stop feeding the troll yo...
It's the same as saying the 10-15 fuel consumption figure means nothing
so "never argue with stupid people, ..."

I am interested in getting room cold only.

I am renovating another room which is 26 foot x 30 foot.
Putting the aircon lower from ceiling have any bad effect?
Inverter or not because all the new ones comes with R410?
Can recommend any proven aircon to make it cold?

Actually I think that you guys should stop attacking each other on the calculation and work towards the better of the community.

I think that most manufacturers figures are tests done in controlled environment with preset temperature which may be different from what you are using, and most probably something that you find hard to achieve in real world situation. There are so many things that become variables when it comes to real world application.

Basically an inverter saves energy in the long run compared to non inverter when you run them as per manufacturer's recommendation. How much saving probably is the biggest variable since they are a number of aspects that may influence the actual savings achieved.

The Samsung air cond that I installed last week had temperature and usage meter. At first, I kept monitoring it to see if it really save a lot of energy. Honestly it really didnt change much between 26C to 27C and 28C. There are differences, no doubt, but not really that much to cause you concern. Therefore, just enjoy the air cond and worry less about the energy consumption.

With El-nino effect, most ac cond installers only have time to die but you have time to troll.
That's means your skill and attitude are having problem

Yeah, whatever you say, it does not change the fact you know nuts, air cond motor is the best joke of the year. A contractor that work 10 years that support lies how good he is everybody will tell.