how u calculate the room btu ? what about lighting.. ? punya heat... etc etc etc ?

It is not just the inverter. The size of the aircon too.

The start stop is depend on the weather. When there is hot weather, the aircon run more. I can tell because I put it into auto mode.

The amount $ I save is already can buy another unit. So why you guys still doubt about inverter?

here... simple room btu calculation for air cond...
http://www.goodhousekeeping.com/home/air-c...oner-calculator

can advice how many HPs and Inverter or not for my living room?


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true camel - 55313.2 BTUH Sensible Cooling - 31139 Btuh

Assuming, instead of 180sq ft, your is 500 sq ft instead with 1.5HP air cond. If you use Inverter, you will actually ended up using 10% more electricity than a non-inverter air cond. So using wrong size air cond will not save money.

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Added on June 28, 2012, 10:40 amI think you need over 30,000 BTU.

If you only fit one unit of 24000 or 27000btu, just get the non-inverter.

If you are going to fit 2 units of 18000 + 18000, inverter should work for you.

My 2 sen.



This post has been edited by Optiplex330: Jun 28 2012, 10:40 AM

It is not wrong size. My room is just about the 1hp spec. But I haven't calculate in the room insulate and wall radiation heat. The next spec is 1.5hp. There is no 1.25hp in the market. Which 1 you pick?

So if choose the 1.5hp size than, inverter or non inverter? Which 1 is saving? Don't get confuse with size and inverter.

BTU of the Inverter and non inverter is about the same. It just the way of inverter running is saving your bill.

sorry what is 18000?
how many HP is that?

Also inverter running at 100% load is actually less efficient than non inverter.

Whatever the gas R22 will be phase out, so in future we maybe running the same gas for both inverter or non inverter. Or maybe another type of gas.

18000btu....= to 2.0hp

18000btu/h per unit is too much la. Get 2 units of 15000btu/h AC. Total 36000 btu/h is overkill. Inverter or non inverter you look at how is your usage. 9000btu/h equals to 1HP.

Unless budget restraint, my view is, better to have too much/big than have too little/small. With too much, you can always turn it down but not the other way up.

And beside, I think 30,000 is the minimum so best be more conservative. My calculation ranges from 30,000 BTU to 35,000 BTU but I don't know which is the accurate ones.


This post has been edited by Optiplex330: Jun 28 2012, 12:22 PM

My calculation goes to a slight bit less than 32,000 btu/h. It is really his preference. For me I will go for 2 units of 15,000 btu/h unit. I personally believe that it is enough. Optimise what I need and save on my wallet.

There are several variables and I notice this is for living room. You may need the bigger 35000BTU if:
1. There are constant people moving in and out of the room.
2. Lots of sunlight coming into room
3. More people in living room compared to bedroom.
4. Extra heat from big Plasma TV
5. Huge Class A heat generating amplifier for HiFi
etc

Of course there will be.

1. There are constant people moving in and out of the room. - We do not know that. How often do we see people go open the front door of the living room?
2. Lots of sunlight coming into room - My calculation is facing east in the evening
3. More people in living room compared to bedroom. - My calculation is based on 4 people in the room
4. Extra heat from big Plasma TV - My calculation is based on the usage of 600 Watt electrical appliances
5. Huge Class A heat generating amplifier for HiFi - I did not consider that

I think only the person asking the question can answer those.

This post has been edited by Optiplex330: Jun 28 2012, 12:50 PM

Huh? Lots of people going in and out from your living room? Only hotel has that in a lobby. Your occupants don't sit around the house but go out and in all the time? I go in and out from my bedroom quite often. More often than going out from my living room to my porch.

During the morning, heat from sun is lesser than of the evening. If the living room is facing the east, during sunset, the heat will go to either the kitchen or else where. Living room will be spared. I put the room facing east as a buffer, since the best/ not hot situation will be the room either facing north or south (sun will go from east to west without direct light going into the house). Worst case will the room facing west, and I hope that this living room is not.

See..everybody is different. I go in and out of living room often. Sometime to the garden to water the plant. Sometime throw rubbish etc. As for bedroom, only go in at night at bedtime to sleep and I don't sleep walk. As to what the person who posted that question did, have to ask him.

Your post "My calculation is facing east in the evening". It confuses me. Why only face east in the evening? Does it means during the morning, it faces West? Hence my question. For me, those facing West and hence full force of the hot afternoon sun is the worst for air cond.

I don't think this is a right statement.

Both non-inverter and inverter work the same way, aka full loan at start to achieve the set temperature.

So there is no reason the room cool down faster with inverter or not.

Well, select what suits you best. Me and you are here to give him/ her opinion.

In my another phrase, I apologize that I confused you. My bad?

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Added on June 28, 2012, 1:59 pmWrong. Inverter runs from from 30Hz to 70Hz. Compressor RPM at 70Hz is higher than standard non-inverter 50Hz, hence cooling rate is higher. Check out Panasonic, Daikin, Mitsubishi catalogue for 50% faster cooling.

This post has been edited by lingleeyen: Jun 28 2012, 01:59 PM