A true inverter can go from 100% load to 20% load, it can be 80%, 70% or even 60% depend on room and external temperature. That is why we need signal wire to drive the inverter compressor and motor speed.

I am giving calculation assuming all at 1KW, with per claim by manufacture "Panasonic" giving 30% better efficiency for easy calculation.

The lower you set the temperature, you get less efficiency.

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Added on February 7, 2012, 11:49 pmInverter do reduce power consumption, but not heavy and earth difference for all situation and usage. People like me using 23c lower will not see 30% as claim by manufacture.



This post has been edited by weikee: Feb 7 2012, 11:49 PM

He he

The inverter Aircon is not need used the lower temp. than 25C.

You can set to 24C, I can gurranty you that whole night is just like stay inside the cooling room & can't sleep as well.

Even me also can't tahan that cold.

When i use a/c it must be 23 or lower. To me 24 and above is stuffy, i rather use ventilation + outside air. If 24c can work for all, why inverter a/c allow users to set temperature <20c?

There are a lot of factors need to take into consideration.

The room, heat transfer issue, surrounding (aka tight or not the air transfer), still play a major important part.
Non-inverter got a sensor to detect the temp, if the sensor fail to detect the pre-set temperature due to more heat being transfer into the room, it will result the compressor running non-stop.
Position of the blower also play another major important role, if the blower is located near ceiling (ceiling is hotter), it will result the sensor keep on detect warm air, and won't tell the compressor to stop working.
Also cleaningness of the blower, efficiency of the compressor, BTU (the non-inverter and inverter at the same hp, different model, may result in different BTU).

For direct comparison or to investigate the actual saving, one needs to eliminate the variation of room condition as mentioned.

Yes, Inverter does save electricity, but it depends on how the usage.
Inverter saving current used come from ability to run the compressor at slower load, instead of start-stop-start-stop in non-inverter.
It doesn't save you any current if they have to run non-stop or 100% load.
Inverter doesn't give you more "cold", the basic of cooling air output is as same as non-inverter.
Inverter mostly uses different gas R410a, instead of R22, and run at higher pressure.

Inverter does save you in turn of ROI if being used in proper way (aka the room can achieved the pre-set temperature), and being used continously long hour, but not up to extreme to 70%.

I'm planning to change my old air-con soon. Between Panasonic and LG, which should I go for? And what's the street price for inverter air-con now? Thanks for your help.

Better pana coz lg will give more headache in future...
unreliable sensor

Hi, don't go for panasonic all the part is made from china or indo.

LG maybe much better.

If you don't mind the York interver Y-series,
My wife kampung in Sawarak recently installed before CNY we when back and used if eveynight is given us very impressive of the quiet noise and getting very cold on 4m x 4m wide x 3m height kampung wooden house, we just only chose for 1hp inverter is really can cover all the room & completed installed = Rm1250, maybe here can be find more cheapest.

Cause on York parts is made in m'sia but very durable also, the important thing is parts can be find easily and cheap some more.

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Added on February 10, 2012, 10:14 amWhy not chose the Panasonic very nice outlook design.

But outside condenser is too small, used for long-term and very easy get over heat of small coil for ventilation.

So I chose over york is using all daikin parts

This post has been edited by kimsim: Feb 10 2012, 10:14 AM

I would think on the contrary. The 4 units of Pana AC that I have recently installed are giving problems. Thus ending up having to pay extra to extend the warranty.

Thanks for the feedback.

I need to get a 1 Hp aircon. What brand do u guys recommend?

York inverter - Rating 5
Daikin inverter - Rating 4 cause of too expansive.
Mitsubishi electric inverter - Rating 5
Mitsubishi heavy industry inverter - unknow yet.
Hitachi inverter - Rating - 4 cause is a bit noisy air on level 1 fan speed.

http://forum.lowyat.net/topic/2196858

is it ok to put the compressor higher than the air-con? if yes, is there a limit on how high it can goes?

Hi, you can put the outdoor condenssor higher than indoor fan coil.

Just only can't put at back to back for that piping not easliy to allow you bending to connected from inside to outdoor.

Cause the condenssor someone they install at 2nd floor level, but used in ground floor also can.
Then like that can be hide the ugly look.

The further between Compressor and blower unit, you need to increase the HP. But for house 10 to 20 feet is not much a problem. In one of my office oversea, we had compressor and blower distance of 7 floors. That we need to increase the HP by 50%, as recommend by HAVC expert.

Many of us got the wrong idea, to my thinking..

Regardless what brand you use, a 24C is always 24C..

There is no such thing xx 24C is cooler than yy 24C

I think what matter most in the selection of aircond is the cooling capacity..

Consider everything from heat load, external heat etc and get the right cooling capacity..

That way you wont overprovide or underdesigned your AC

It can be difference if the thermostat is not calibrate correctly.

I can recommend you install Mitsubishi electric 1.0hp inverter for normal 3x4x3h there is only set at 25c with 1 level fan speed is = your non-inverter 22c.

I can gurranty you no regreted and 21db for level 1 fan speed.

22c non inverter will flipper around + 2c (maybe more not too sure).

25c for inverter will flipper but less than non inverter. But 25c is still 25c is not same as 22c.

E.g. If i go get myself a inverter fridge, and set it to 1c, ice still melt because is not 0c. You cannot say inverter 1c = non inverter 0c

When one set the temp to 22c, does it mean the aircon will make the whole room at 22c? perhaps yes, perhaps no, it depends on your aircond power, room size, number of windows, number of persons, location, the room temperature may not reach 22c even the compressor running all the time.

Human sense temperature differently, there is a term call windchill effect, if you set the temperature at 25c but you are directly facing the aircond blower, you will feel the temperature below 25c probably like 22c, but if your position is quite away from the aircond fan, you will feel it is much hotter.