Your Opinion of Mitsubitshi "Inverter" A/Cs

[johng]

That would depend on how well insulated the room is but...I would go with turning it off when you're not at home....if you want to get fancy hook.it up to some sort of internet enabled smart switch and command cooling to commence about 30 mins prior to your ETA.

[Pib]

1 hour ago, lust said:

I’ve got a stupid question. Is it more efficient to run my inverter AC 24/7 at a temperature of 25 degrees on low fan setting or should I shut it off when I leave the house from 7am-5pm and turn it on when I come home and have it using max power to re-cool the living room?

Running a test would be best if you have easy access to you electric meter, but based on the parameters you gave I would think turning it off for that 8 hour period would save more.

[wpcoe]

On 6/13/2018 at 6:36 PM, johng said:

 

....if you want to get fancy hook.it up to some sort of internet enabled smart switch and command cooling to commence about 30 mins prior to your ETA.

Most modern air con remotes have delayed on/delayed off functions, too.  Just set the delay-on to turn the unit(s) on 30-60 mins (depending how granular the time control is on your remote) before you plan to get home.

[stud858]

Can anyone state some money figures. 

For example I switched from a 20 year old bolted rectangle box on the ceiling type to a sharp not inverter and the bill went down by about 40%

If I chose the inverter type I guess it wouldn't be a further 40% and I guess it depends on how it's used.  For example I prefer direct cool wind hitting my body but not necessarily wanting the whole room at 23. I set it at 28 and sometimes use a fan next to the bed also. 

On 1/2/2018 at 11:00 AM, xylophone said:

Have recently installed a Mitsubishi 15k BTU Mr Slim inverter a/c in my apt and it is working like a dream........very efficient and saves on the previous elec bill.

 

Have had Samsung before and they are poor compared to the Mitsubishi

[lopburi3]

As you found there has been great improvement in air conditioning over the years - even without inverter.  But if you changed to inverter from what you have now I would expect about 20-30% savings from current charge.  Inverter is good for direct cooling as normally blowing cooler air all the time and the 9k unit we have seems to blow the air across length of long bedroom very well..

[stud858]

5 minutes ago, lopburi3 said:

I've been looking at peltier cooling youtube videos.  It seems like it's possible to make a small cooling fan and if used to cool just your personal space rather than a whole room there are even more power savings.

I've ordered parts and will play around trying to build one. 

As for noise levels of AC I've been happy with Sharp brand and not happy with Samsung.

LG is 50-50.

 

[Pib]

A belated drum roll please....below is my usage/bill for the 13 Jun-13 Jul, 13 Jul-13 Aug, and 13 Aug-13 Sep 18 billing periods.  You can see previous months in earlier posts.

 

Average daily use for 30 day period of 13 Jun-13 Jul 18 was 45.33 Kwh/day compared to the previous 3 year average per day of  60.54 Kwh/day.  That works out to a 25.12% reduction/savings.  "The first time it has fallen below 30%."  Since I haven't cleaned the A/C since its Jan 18 installation, I began to wonder if it needs cleaning and that's why the savings percentage has rolled off.  But since I'm lazy I decided not to clean the A/C especially since air is still  blowing out the vent evenly across the entire length of the vent and the fins/coils look clean.  When a cage fan gets too dirty the air flow output will not be even across the entire vent length.   Maybe it's just the weather and the A/C is not too dirty.  As mentioned, I'll do "not" accomplish a cleaning....instead, I decide I'll wait and see what the next month brings.

 

Next month has arrived.  Average daily use for 31 day period of 13 Jul-13 Aug 18 was 41.52 Kwh/day compared to the previous 3 year average per day of  58.96 Kwh/day.  That works out to a 29.58% reduction/savings.  This is the second time it has fell below 30%.  But I still don't do a cleaning....once again I want to see what the next month brings as fins/coils look clean and cage fan is blowing out air evenly....plus, I'm still lazy.

 

Once again the next month has arrived and average daily use for 31 day period of 13 Aug -13 Sep 18 was 38.07 Kwh/day compared to the previous 3 year average per day of  60.98 Kwh/day.  That works out to a 37.58 % reduction/savings.  Yea....I'm back over a 30% savings...significantly over.  Since I still hadn't did a cleaning and it's still hot & humid the two earlier months where it dropped below a 30% savings was probably just weather-related vs the A/C being too dirty. 

 

I have done a cleaning now...did it myself....got unlazy (briefly)...cleaned the evaporator (inside unit) yesterday....17 Sep....will do the outside outside unit (condenser/compressor) in another month or so as that requires me getting a long ladder out since the unit is mounted halfway up the house.  But from looking at the outside unit fins from ground level they do not look dirty.  Anyway, the "evaporator" cage fan "level of dirtiness" looked very similar to the picture above posted by johng.  The fins/coils were still pretty clean.

 

So far this Mitsubishi inverter A/C has been saving me a bunch of money each month on my electric bill and it has pretty much run 24/7 since installation in Jan 18....it probably hasn't had more than 2 or 3 hours of  being turned off when we decided to run another A/C in the downstairs area so that other A/C could get some periodic exercise.  Now I get a smile when looking at my monthly electric bill because I remember before I got the inverter A/C I dreaded looking at my monthly bill.

 

 

[cheeryble]

Ouch! Wouldn’t be smiling if I spent 45x3.5baht x 30 per month.....about 4500bt?
Have never had a house with glass in the windows (shutters) in 15 years so no air con, fans have been fine all but the very hottest days, but presently building a glass windowed house so will have to have three units. Will have to ration the family!


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[Pib]

11 minutes ago, cheeryble said:

Ouch! Wouldn’t be smiling if I spent 45x3.5baht x 30 per month.....about 4500bt?
Have never had a house with glass in the windows (shutters) in 15 years so no air con, fans have been fine all but the very hottest days, but presently building a glass windowed house so will have to have three units. Will have to ration the family!

 

It's the price of staying cool 24/7.  IMO it beats trying to convince myself (and the family) open windows and fans moving hot & humid air around is good enough.  I guess I can't sound convincing enough talking "cool breezes gently blowing thru the house."

[cheeryble]

To be fair a pal spends about 10kpm but think a fair bit goes on the pool pump.
(another luxury a spartan avoids when he has use of a condo pool)


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[CGW]

54 minutes ago, Pib said:

 

It's the price of staying cool 24/7.  IMO it beats trying to convince myself (and the family) open windows and fans moving hot & humid air around is good enough.  I guess I can't sound convincing enough talking "cool breezes gently blowing thru the house."

You have convinced me! believe we had one day last year when we had "cool breezes blowing thru the house" unfortunately we had the insect screens closed and they blocked 99% of the cross breeze. AC so much more dependable ? 

[Pib]

50 minutes ago, cheeryble said:

To be fair a pal spends about 10kpm but think a fair bit goes on the pool pump.
(another luxury a spartan avoids when he has use of a condo pool)
 

I gave up on my spartan way of life after retiring to Thailand....it's 24/7 air con for me now

 

Me Before

 

Me Now

 

 

 

 

[xylophone]

1 hour ago, Pib said:

 

It's the price of staying cool 24/7.  IMO it beats trying to convince myself (and the family) open windows and fans moving hot & humid air around is good enough.  I guess I can't sound convincing enough talking "cool breezes gently blowing thru the house."

Same as you and very satisfied with my Mitsi inverter aircon, and have it on longer and more often than the one before for about the same cost.

[cheeryble]

I gave up on my spartan way of life after retiring to Thailand....it's 24/7 air con for me now
 
Me Before

 
Me Now

 
 
 
 

Not surprised u need air con with all that beard


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[Pib]

On 1/4/2018 at 6:48 PM, Pib said:

Product price: Bt35,800 plus another Bt3,000 install....total Bt38,800

 

Just as an update. 

 

I now have a full 12 months savings data (13 Jan 18 thru 13 Jan 19) after installing the Mitsubitshi 23K BTU A/C into my mix of home air cons on 8 Jan 18.  This inverter A/C replaced a non-inverter 18K BTU A/C.  Total cost of the inverter A/C is quote above from an earlier post. 

 

As mentioned earlier in this thread although I have splits A/Cs in all the rooms of my two story house, only two A/Cs get used a lot.  Those two A/Cs are the new Mitsubishi inverter A/C which runs 24/7 to cool a downstairs area and the upstairs master bedroom A/C (20K BTU non-inverter) that runs 10-12 hours seven days a week.  All the other A/Cs only get turned on briefly now and then.  So, basically only the 23K inverter A/C and 20K non-inverter A/C are used.

 

When comparing the 13 Jan 18 - 13 Jan 19 inverter A/C use period with an "average of three previous years for the same 12 month period" then my average monthly KiloWattHour savings was 32.75%.  Which in my case resulted in a Bt31,402 savings when using a Bt4.41/Kwh cost (basic KWH cost plus all related fees like VAT and meter fee).

 

A Bt31,402 savings over 12 months.  In about 3 more months, for a total of 15 months, I will have recovered the cost of the inverter A/C.   

 

I only cleaned the inverter A/C once so far approx 6 months ago....and it was still pretty clean...even the cage fan was still pretty clean.  Much cleaner than the cage fan on my non-inverter A/C ever was when cleaning it once every 6 months.  This is probably due the non-inverter A/C cage fan running at a higher speed due to the nature of a non-inverter A/C....gives it more chance to pick up more dirt and grime. 

 

And probably what I'm going to do in approx 3 months is to replace the non-inverter master bedroom A/C with a Mitsubishi inverter A/C....most likely the same model of the downstairs inverter except 18K BTU instead of 23K BTU.   Since the master bedroom A/C only runs 10-12 hours per day and based on an estimated total cost of approx Bt29,000,  I guesstimate it will take around 30 months to recover the cost.

 

 

Edited January 14, 2019 by Pib

[BritManToo]

4 minutes ago, Pib said:

A Bt31,402 savings over 12 months.  In about 3 more months, for a total of 15 months, I will have recovered the cost of the inverter A/C.   

Most of us don't use air-con that much.

My air-con is only on a few hours a night for the hotter nights, and adds 300bht to my bill for the 6-8 months I use it.

2,400bht a year, 32% of that would be 800bht savings a year.

[Pib]

10 minutes ago, BritManToo said:

Most of us don't use air-con that much.

My air-con is only on a few hours a night for the hotter nights, and adds 300bht to my bill for the 6-8 months I use it.

2,400bht a year, 32% of that would be 800bht savings a year.

Yeap....payback period all depends on how much you use an A/C, how big of an A/C & area you have to cool, and a variety of factors.  But for anyone who uses an A/C a lot an inverter can provide good savings.

[tutsiwarrior]

37 minutes ago, Pib said:

And probably what I'm going to do in approx 3 months is to replace the non-inverter master bedroom A/C with a Mitsubishi inverter A/C....most likely the same model of the downstairs inverter except 18K BTU instead of 23K BTU.   Since the master bedroom A/C only runs 10-12 hours per day and based on an estimated total cost of approx Bt29,000,  I guesstimate it will take around 30 months to recover the cost.

 

 

 

yeah, after observing the performance of the 23k btu Mitsu inverter downstairs I thought about replacing the upstairs bedroom 18k Hitachi non inverter with an inverter unit...but as the upstairs unit is only 5 y.o. I can't justify the expense regardless of the lower operating cost...

 

sorta like with thinking about a new phone 'hmmm, sure would like one with that newer OS...' and then the good devil perches on me shoulder and sez 'but tutsi yer old phone works perfectly well for yer purposes which haven't changed so don't be foolish, etc... and yew ain't got a job and with all the usual responsibilities and yadda yadda...'

 

and the bad devil sits on the other shoulder and sneers...'go ahead and get the new upstairs inverter AC and the new phone, what's a few thousand baht here and there? besides, yer not gonna live forever, ye goddam kee neow falang!'...

 

 

Edited January 14, 2019 by tutsiwarrior

[grobec]

 
yeah, after observing the performance of the 23k btu Mitsu inverter downstairs I thought about replacing the upstairs bedroom 18k Hitachi non inverter with an inverter unit...but as the upstairs unit is only 5 y.o. I can't justify the expense regardless of the lower operating cost...
 
sorta like with thinking about a new phone 'hmmm, sure would like one with that newer OS...' and then the good devil perches on me shoulder and sez 'but tutsi yer old phone works perfectly well for yer purposes which haven't changed so don't be foolish, etc... and yew ain't got a job and with all the usual responsibilities and yadda yadda...'
 
and the bad devil sits on the other shoulder and sneers...
 
 

Hi
Not sure if I missed it in posts but I have appx 100sqm with L shape and installed a mitsu 24 and a 15 in the shorter L.
Much quicker cool from hot and they both kick into lower btu @26% and give us even temp throughout. In econo mode we forget that they are running. Great comfort and never chilly. Our bill is no higher that we expected with one unit. Cost depends greatly on windows and insulation from radiant sun.


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[Fruit Trader]

Replacing old non inverter AC with new inverter model. 

 

Accurate inverter and non inverter comparison figures would require data from brand new units at identical locations with identical outside temperature for the duration of test runs. Anything else is just nonsense.

 

Replacing an old non inverter AC with new non inverter AC could easily result in huge savings if the old AC had become very inefficient.

 

Our fairly new and well maintained office non inverter AC was replaced with inverter type after a delivery truck destroyed the outdoor unit. The AC runs for 10 hours/day and the saving are maybe 15% at best guess as I dont have outside temperature data for accurate comparison.

[Pib]

21 minutes ago, tutsiwarrior said:

 

yeah, after observing the performance of the 23k btu Mitsu inverter downstairs I thought about replacing the upstairs bedroom 18k Hitachi non inverter with an inverter unit...but as the upstairs unit is only 5 y.o. I can't justify the expense regardless of the lower operating cost...

 

sorta like with thinking about a new phone 'hmmm, sure would like one with that newer OS...' and then the good devil perches on me shoulder and sez 'but tutsi yer old phone works perfectly well for yer purposes which haven't changed so don't be foolish, etc... and yew ain't got a job and with all the usual responsibilities and yadda yadda...'

 

and the bad devil sits on the other shoulder and sneers...'go ahead and get the new upstairs inverter AC and the new phone, what's a few thousand baht here and there? besides, yer not gonna live forever, ye goddam kee neow falang!'...

 

 

I hear you about the replacing a non-inverter A/C still working just fine.  Where your non-inverter A/C only has 5 years under its belt my bedroom A/C is now in it's 11th year of life.  And the downstairs A/C that I replaced with the 23K inverter A/C I've been talking about died in it's 10th year of life--I could have gotten it brought back to life for around Bt8K but I figured due to that cost and its age (how long before the next costly repair cost) it was time to get a new one....and get an inverter A/C since inverter A/C prices have come down lot of the last 10 years.     

 

Where I'm thinking about replacing bedroom non-inverter A/C in my bedroom is driven by the potential cost savings and not too long of a  payback period.....and it seems to be developing a few old age issues I won't bore you with details-wise. 

[grobec]

Replacing old non inverter AC with new inverter model. 
 
Accurate inverter and non inverter comparison figures would require data from brand new units at identical locations with identical outside temperature for the duration of test runs. Anything else is just nonsense.
 
Replacing an old non inverter AC with new non inverter AC could easily result in huge savings if the old AC had become very inefficient.
 
Our fairly new and well maintained office non inverter AC was replaced with inverter type after a delivery truck destroyed the outdoor unit. The AC runs for 10 hours/day and the saving are maybe 15% at best guess as I dont have outside temperature data for accurate comparison.

Unlike a refrigerator, a home or office ac goal is comfort. No matter the savings, if comfort is not achieved then it is all for not and officials productivity reduced.

Once cool the inverter machine can reduce btu (cost) while continuing to reduce ambient moisture.

Then comes heat gain which is why significant glazing ups the required btu.
Planting a few well located trees helps too.




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[KittenKong]

7 hours ago, Pib said:

A Bt31,402 savings over 12 months.  In about 3 more months, for a total of 15 months, I will have recovered the cost of the inverter A/C.   

Mine also paid for itself in just over a year.

What I dont know is how much of the saving was due to the inverter and how much just due to the new one being new.

[KittenKong]

7 hours ago, BritManToo said:

Most of us don't use air-con that much.

I never turn mine off. It's much too hot and sticky here for that.

[aoneseller]

Hi Pib. Its been a year that I purchased a Mitsubishi Inverter msy jp24vf 24000 BTU. Not the same model like yours. Anyway its working well, its been used during night mostly let's say 12 hours a day. Electricity bill is 1600 baht. I am the one who servicing it with Norca spray, and washing it with water (coils and cage fan). Can't complain. 

[Pib]

I just posted a more detailed update on the savings I have achieved so far in below related thread.  The payback period for my Mitsubishi 23K BTU inverter A/C was 14.2 months.   See below post for full details.

 

 

[aoneseller]

Okay Pib I was reading through your posts and I assume you're a well experienced aircon specialist. I really appreciate your knowledge shared with people. Here is my problem. I have an 8 years old LG x13au 12000BTU standard unit. Located in the hot upstairs room. In the first couple of years it worked well even in the hot April daytime was able to cool the room. Now these years it just cold in the night time. It is serviced regularly, gas been checked. Technician said LG no good. Since that time I service it personally. Last time I removed the cage fan, washed it and I used Q-tips with ethil alcohol to remove some hard residue (water couldn't remove it). Put some sewing mashine oil on the bearings of the cage fan when I put back. I sprayed the coils with Norca foam and later washed it with my hand pumping pressure sprayer. I washed the drain tray and line. I straighten with a comb any unstraight fins. I also washed the outside unit too. 

Now, in the night when I check the out coming air temperature from under the cage fan is 9 celsius. Nighttime is OK. However daytime the outcoming temperature is 17 celsius. Mainly there is no point to buy a new aircon because I use it before sleep for 2-3 hours daily. 

 But it still bothering me why this aircon cannot cool the room in the daytime like years back. 

[Pib]

Me....an air con specialist?!   First, thanks for the compliment...but I'm just a DIYer from the day I was born....be it overhauling car engines....fixing electronics...or taking care of my auto and home A/Cs.  I just hate paying a high price for something I can do myself.    And believe it or not, just 10 minutes ago I finished fixing a York 9000BTU A/C in my computer room....it was cooling fine but the output louver (i.e., the output vents that swings) wasn't working....working fine a few days ago...stopped working yesterday. 

 

Took the evap cover off and immediately saw the problem...."a little plastic part on the louver had broken (just got brittle over years as the A/C is 11 year old)...fortunately I was able to fix it with some super glue and heat shrink tubing.   A/C now fully operational again.

 

But regarding your problem the evap output temp should be able to get down to around 10-13C during the daytime.   Since the evap and compressor unit are clean and assuming the refrigerant level is OK I would think it's a sensor or compressor problem.  If it's a compressor problem then it probably not working properly when getting hot....during the heat of the day.

[aoneseller]

I checked the sensor in the inside unit it looks physically okay and if I press the room temperature button on the remote it always shows the correct temperature. And if I have to change this sensor it looks I could do, its not a difficult task. 

This case it's one thing left.. the compressor as you suggested. This part of the job is over my skills, have no idea how to check or fix the outside unit. 

[lopburi3]

26 minutes ago, aoneseller said:

I checked the sensor in the inside unit it looks physically okay and if I press the room temperature button on the remote it always shows the correct temperature. And if I have to change this sensor it looks I could do, its not a difficult task. 

This case it's one thing left.. the compressor as you suggested. This part of the job is over my skills, have no idea how to check or fix the outside unit. 

You are cleaning the outside unit when you clean the inside?  They have to transfer the heat into the air and get very dirty.  Also if a shade tree has been removed it might make a difference also (cool shade best location - as if there was such a place during the daytime this year).