Inverter Air Conditioners – we give up on inverters and on Samsung

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Inverter air conditioning units may be a bad choice for many in the Philippines and other tropical locations, but you won’t hear that from air conditioning salesperson or in the glowing advertisements for them.
Inverter units are highly promoted, cost a great deal more than conventional units, but supposedly save enough money to easily repay the extra cost in months. There are a number of problems with this rosy view of inverter air conditioners.

Our Samsung Inverter. Energy efficient but prone to costly repairs.

Our Samsung Inverter. Energy efficient but prone to costly repairs.

Inverter units use advanced technology involving more electronics, higher refrigerant pressures, higher voltages and more complexity. A conventional air conditioning unit runs pretty much like a refrigerator. When cooling is needed, the simple AC current compressor runs until the room is cool and then shuts off, recycling as needed to cool the room. It’s not unusual for conventional units to run a decade or more with only routine cleaning. Alternating current is what you get from your wall outlets.
Inverter air conditioners use compressors running on DC current. The DC compressors don’t cycle on and off, they are able to just slow down as the room is cool and speed up if more cooling is needed. Conventional compressors use extra electricity when cycling on and off, inverter units don’t. An oversize conventional unit is the worst choice, as it has to cycle off and on frequently. An undersized conventional unit can run more continuously and can actually be more efficient than an inverter unit. The inverter units use extra electricity to convert the power supply from AC to DC.

Typical advertisement for an inverter air conditioner.

Typical advertisement for an inverter air conditioner.

The money saving scenarios presented in the inverter brochures should not be taken at face value. One brochure in front of us claims 50% savings for the inverter unit. It compares a conventional 1.5HP unit to a 1.5HP inverter. It assumes a room area of 16.5 meters. This is the first problem. We feel a 1.5HP conventional unit is too large for a 16.6 sq meter room. A 1HP conventional unit would run much more efficiently than a 1.5HP conventional unit and possibly as efficiently the bigger inverter unit.
But the dirty secret about with inverter units in the Philippines and other tropical places is increased repair costs and reduced longevity. Conventional air conditioners often run for decades. Our 1.5HP Samsung inverter is just shy of five years old. So far it has blown out two main circuit boards because lizards crept into the high power main circuit board in the outdoor unit. This incinerated the poor lizard and the circuit board. Each board cost P7,000 ($155) to replace. In other cases ants and mice have blown boards. If you live near the ocean, salt air can corrode the boards. This is a wide spread problem that you are not going to learn about from the salesmen, but ask the service personnel, and you’ll get the real story.

Conventional air conditioners do not have these high power, lizard electrocuting, self-destructing boards.  We had a visit from a friend from Australia.  They have exactly the same problems with geckos shorting out inverter units.  We have also read similar reports from Thailand.  The Australian friend concluded that inverter units are just not suitable for use there.  We have come to feel the same way regarding rural or suburban areas in the Philippines.  Non-inverter units are no longer sold in Australia due to government regulations intended to save electricity.  It’s our understanding that governments and utility companies like inverter units because their power consumption is more even, whereas conventional units impose significant loads when the compressor cycles on.  Any electric motor uses much more current to start up than it does when it is running.  That’s why an undersized conventional unit uses less electricity.  It mostly is running rather than cycling on and off.   Conventional units are still sold in the Philippines.

A small lizard destroyed this $160 Samsung circuit board - TWICE

A small lizard destroyed this $160 Samsung circuit board – TWICE

In the meantime the conventional Samsung 1HP unit we installed in our guest bedroom purrs along with no repairs at all. The Samsung Inverter cost P11,000 more than the conventional unit, repairs to the inverter unit (so far) P14,000.
So, in our view you pay considerably more for the inverter when you buy it, it might or might not use less electricity but these savings are offset by high repair costs.
Manufacturers are aware of these circuit board problems. We have read that Panasonic and Mitsubishi Heavy Industries are silicone coating their exterior circuit boards. Maybe this will help. Time will tell.
Now if you live in a place with no lizards, mice and ants, maybe the 20th floor of a Makati condo, an inverter might be the best choice. In fact inverters may be a good choice in many urban locations. If expensive repairs are not needed, they can save money. If you live in a suburban or rural area with some greenery, think twice before choosing an inverter unit. You heard it here. You’ll never hear it from a salesperson.
Here is the perspective of one recycler of air conditioning units on inverter air conditioners. Video about inverter air conditioners  There is also many accounts and opinions on the Whirlpool Forums forum. Spending some time in these forums will give you a sense of the problems ordinary users have with their air conditioning units.

While the salesmen and manufacturers promote inverter units and fail to tell the customer about the problems, don’t bother to ask them to repair the units under warranty after the first year.  Your gecko problem is your gecko problem and you pay for repairs.  In other words, you were a fool to buy such a unit in an area populated by geckos.  That is basically what Samsung has told us.

daikin

Samsung removed, Daikin being installed

New Daikin Split Air Con Unit

New Daikin Split Air Con Unit

In the end we were forced to remove our Samsung inverter with a Daikin conventional unit. This is a steep financial loss, but it was a chance to test a theory of mine.  After thought and research, I hypothesized that a top quality “undersized” conventional unit is the best choice for us.  The Daikin 1 HP FTJ10JXVL9  we installed is rated at 9,500 kJ/h, about 2,000 kJ/h less that the Samsung we removed.  Our bedroom is about 25 square meters. It definitely will not meet the standard promoted my the manufacturers who want you to install an expensive 1.5 or 2.0 HP inverter unit for this size room based on 35C outside temperature. The Daikin was installed on a hot day and definitely ran continuously and cooled the room to an acceptable temperature. Running continuously is highly efficient (the compressor is never cycling on and off) and does a good job of dehumidification.  Our actual use is air con when we sleep.  When we go to bed, both the inside and outside air temperatures are well lower than those proposed by the air con manufacturers. Therefore the 1 HP Daikin will be more than adequate.  The Daikin has a rated cooling efficiency of 10.70 kJ/h.W, nearly as good as the inverter unit it is replacing.

So this is how we are saving money.  Our Daikin cost about P25,000 installed.  A 1.5 or 2HP inverter from one of the major brands would have cost at least P15,000 more, installed.  The Daikin will run for years or maybe decades without significant repairs because of its mechanical and electrical simplicity.  Our Samsung required nearly P6,000 in repairs per year.

We are very disappointed with Samsung, for selling us a unit unsuited to our gecko-infested rural area and then being unwilling to make repairs except at our full expense.

We bought two Samsung split air conditioners in 2011.  The Samsung Inverter has been nothing but trouble, but to be fair the 1HP non-inverter Samsung split we bought at the same time has been excellent.  It is made in China.  The outdoor unit is of sturdy plastic, not susceptible to rusting as the steel casings are.  The condenser fins have resisted corrosion better than the inverter unit even though the conventional unit is more exposed to salt air than is the inverter.  It’s a well-built trouble free unit.

Daikin is a Japanese company with an excellent reputation, but its air conditioners are made in various countries. Our Daikin was made in Malaysia.  We also feel Panasonic makes quality air conditioners but in the one horsepower conventional category the Daikin offered 500 kJ/h more cooling and more cooling per Watt.

Comments (174) Write a comment

  1. Thank you very much for your information. You hit the nail on the head. we give up on Samsung and want to throw all our 4 air conditioning units away. To think we bought all in good faith trusting the brand and their claim to be environment friendly. We will never buy any Samsung product ever again .

    Reply

  2. I have been here reading for a few years even before we started building a house in rural Pampanga. Many topics I have read several times. Aircons has been one of them. Your posts have convinced me to go with non inverter units of either Daikin or Pansonic. My problem right now is the size of the aircons. The room we are buying for is 24 square meters. From your posts it seems to me a 1hp unit would be best. However everyone else wants me to go with a 1.5hp and that includes our foreman, my wife and every salesman she talks to.

    Here are the bedroom sizes and would like all learned opinions on what others would do. BR1 is what we are looking at right now. The house will be insulated well with PU foam in the roof, celluose in the ceiling, low-e glass in the windows and most of the outer walls will have EIFS (external insulation finishing system).

    Master bedroom: 44.66 sq m.
    BR #1: 23.75 sq m.
    BR #2: 22.79 sq. M.
    BR #3: 20.52 sq. M.
    BR #4: 20.42 sq. M.
    BR #5: 14.57 sq. M.

    My online research has lead me to believe that a 1hp 9000 BTU non inverter unit will work well for all of the bedrooms except the master.

    As info I have talked to companies about a whole house aircon plan using multi splits. I did not get good quotes being a foreigner talking to them on the internet. One company selling solar hybrid aircons quoted me 1.3 million pesos to install a system. Mr. Aircon wanted to install some high tech system that was almost as much. Buying units room by room as we finish the house looks like the only way to go.

    What would you do Bob and Carol? Others?

    Reply

    • My wife went ahead and bought a 1.5hp non inverter Panasonic split aircon. They are staying in the new house part time and wanted to get it installed before Holy Week. As info the sales people were all pushing for her to get a 2.5hp unit for a 24 square meter room. I’ve got more aircons to buy so would appreciate any experienced advice. The house is 450 square meters.

      Reply

      • Of course there are so many variables, but I can’t imagine a 2.5 HP in a 25 SM room. They like to sell oversize units because they earn more on them and they will never get a complaint about the room not being cool enough.

        Reply

        • Per my wife who is there the 1.5hp non inverter Panasonic is cooling the room fine. I had my wife ask the installers if the inverter lizard problem has been rectified and they said nothing has changed. They recommend buying non inverter units and Panasonic was their first choice. However they installed for Abenson’s who does not sell Daikin.

          A website from Australia on air conditioners if anyone is interested.

          http://www.canstarblue.com.au/appliances/cooling-heating/air-conditioners/

          Reply

    • Hi Barry, (& Bob & Carol)

      A link to Panasonic website:-

      http://www.panasonic.com/ph/consumer/air-conditioners/split-type-airconditioner.html

      Split A/C’s
      9000kJ/hr – 1.0hp
      12060kJ/hr – 1.5hp
      18180kJ/hr – 2.0hp

      5500kJ/hr – 0.6hp 9.5m2 Window Type CWMC65JPH
      7420kJ/hr – 0.8hp 10-13m2 Window Type CWMC65JPH
      9500kJ/hr – 1.0hp 14-16m2 Window Type CWMC65JPH
      19100kJ/hr – 2.0hp 23-24m2 Window Type CWXC185EPH

      ex Condura & Carrier Brochures
      Condura
      5145kJ/hr – 0.5hp <10m2 WCONC006EC
      7150kJ/hr – 0.75hp 10-14m2 WCONC007EC
      9150kJ/hr – 1.0hp 14-18m2 WCONC010EC

      Carrier
      5100kJ/hr – 0.5hp <10m2 WCARY06EC
      7000kJ/hr – 0.75hp 10-14m2 WCARY08EC
      9000kJ/hr – 1.0hp 14-17m2 WCARY10EC

      The above are suggesting 9000kJ/hr for about 14 – 16m2

      From the EnergyStar figures in the link below and my experience would suggest 9000kJ/hr is adequate for perhaps 30m2 and more.

      https://www.energystar.gov/products/heating_cooling/air_conditioning_room?qt-consumers_product_tab=2#qt-consumers_product_tab

      kJ/hr BTU ft2 m2
      – – 100 9.3
      5270 5000 150 13.9
      6330 6000 250 23.2
      7380 7000 300 27.9
      8440 8000 350 32.5
      9490 9000 400 37.2
      10550 10000 450 41.8
      12660 12000 550 51.1
      14770 14000 700 65.0
      18990 18000 1000 92.9
      22150 21000 1200 111.5
      24260 23000 1400 130.1
      25320 24000 1500 139.4
      31650 30000 2000 185.8
      35870 34000 2500 232.3

      Note the suggested variations in section 3 of the web site

      The greatest variation in power use is whether we have a bright sunny day or overcast. My TOTAL electric use can vary from 11kWhr – 22kWhr per day. I am running Panasonic Inverter split units CS-S9SKQ 1HP [CU-S9SKQ] 24/7 set at 28.5 – 30^C on "dry" mode.

      Total electric includes a/c's, fridge, freezer, TV, shower, lights, fans and computers.

      The last 3 months usages are 498, 415 and 513kWhr. They are now run 24/7 to avoid mould. One is cooling 10m2 the other 30 m2. I will be having the next a/c cleaning after 3 months. Four months was too long there was considerable build up on the indoor unit fans.

      I live in a house completed last year, 2.4m to eaves which provide 0.9m shading. The walls are 100mm (4inch) poured "reinforced" concrete. The rebars are at 400mm centres this would not meet UK requirements to be classified as "reinforced" concrete. The roof is steel sheeting with 5mm double sided foil foam insulation.

      The CS-S9SKQ 1HP [CU-S9SKQ] cooling can vary from 3020 – 11520 kJ/hr

      I would tend to agree with you the 9000BTU/ 9500kJ/hr will be adequate for all except the master. Depending on the cooling capacity increments do you or don't you step up to the next size up for the master? 12000BTU/ 12660kJ/hr. I hope there is some additional information that you haven't seen before and may be of use. Good luck in staying cool.

      Reply

      • We bought our Daikin 1HP over the Panasonic 1HP because the Daikin is rated at 9,500 kJ/hr.

        I feel that the “kJ/hr BTU ft2 m2” chart is a bit over-optimistic for the typical Philippine residence. That is that it understates the cooling power needed.

        We bought the 2HP Daikin for our kitchen/living room. I am embarrassed to say that the reason is that the 2HP is that it is a heavy well-built piece of gear compared to the 1.5HP Daikin which seems more like a souped-up 1HP unit.

        Reply

        • I wanted to add that we took your advice and tried to buy the Daikin but the only retailer I could find, Mr. Aircon, haggled on the price of installation. My wife didn’t like dealing with them so she went to Abenson’s and got the Panasonic. They don’t sell Daikin.

          Reply

      • I thought I replied with a thank you awhile ago but I guess I didn’t. Thanking your now for taking the time and posting Willem.

        Reply

        • Hi Barry,
          Thank you for the thank you.

          This wonderful site of Bob and Carol’s has helped quite a few. Anything that I can add that hopefully may help others I do. Hope the Panasonic units are cooling to your satisfaction.

          Reply

  3. wow thanks Im about to buy a new one. and definately from the area of where you can see lizard around the clock, so I’ll definately give Panasonic Inverter a try and not the other brand. -from Malaysia.

    Reply

  4. Hello,

    Does anybody have any experience or feedback regarding MITSUBISHI SPLIT TYPE A/C?

    Thank!

    Reply

  5. I was just at an appliance store earlier to reserve an oversized inverter unit for our music room.. I planned to get a 2.5hp airconditioner for a 30sqm room. After reading your review, I felt I made a double whammy.. Oversized Inverter! 🙂 Guess I’ll have to release that reservation now… Thank you for sharing your review.

    Reply

  6. Hello. My name is George and today I just made a reservation to buy a 2HP Samsung Inverter split type aircon. The salesman said they are having a sale up to the end of Feb2017. The price difference between the 1.5HP and the 2.0Hp is only P160, so I opted for the bigger size (bigger is better??) If I follow your logic, then I should go for 1.5HP, or maybe even 1.0Hp for a 20sqm room. I’m planning to also replace the window-type aircons in the other rooms (which, by the way, are all more than 15 years old but still functional). I think I shall have to hold off on that reservation. Thanks for your review.

    Reply

    • Not so with inverters. Conventional units must be properly sized, but with inverter units too big is ok as they have the ability to run at slower speeds. So, for a 20SM room a 1HP conventional might be fine but a two HP inverter unit also fine.

      Reply

    • Hello. . My advise for you is not to buy any Samsung Airconditioning units. I have been using Daikin 2.0 HP smart elite and my surprise, my bill has just increased by around 300 pesos by running it 8 hrs a day.

      Reply

  7. Hi Bob and Carol 8 M-Readers

    Very Informative! After read your post on gecko story. My mini green eyed feeling subsided over a fellow of mine showcases their upgrade. 2 units SAMSUNG Spl-type inverter, bragging right of 60% E* savings. They had 2k pesos M- billing on 20h continous running of same’.

    Im planning to buy a window type aircon for our living room, lobby area and wine counter area/lavatory kitchen. Its 52sqm area. I prefered that W-type cause I already had hole in the wall from old ones(nat’l). Thus, hard to find panasonic W-type invert. Im in dilemma between inverter Spl-type w/ 5K installation or conventional W-type w/o fee of panasonic 2.5hp AC?

    Any suggestions may learned others ; )

    Mic n Pnoy

    Reply

  8. Hi Bob and Carol 8 M-Readers

    Very Informative! After read your post on gecko story. My mini green eyed feeling subsided over a fellow showcases their upgrades. 2 units SAMSUNG Spl-type inverter, bragging right of 60% E* savings. They had 2k pesos M- billing on 24/7 continous running of same’.

    Im planning to buy a window type aircon for our living room, lobby area and wine counter area/lavatory kitchen. Its 52sqm area. I prefered that W-type cause I already had hole in the wall from old ones(nat’l). Thus, hard to find panasonic W-type invert. Im in dilemma between inverter Spl-type w/ 5K installation or conventional W-type w/o fee of panasonic 2.5hp AC?

    Any suggestions may learned others ; )

    Mic n Pnoy

    Reply

  9. Hi!
    What a helpful site. My 1.5HP Kolin inverter AC gave up after almost 3yrs of service. Glad I saw this thread to help us decide what AC to buy. 🙂

    Reply

    • Hey Anne! I was thinking of buying a Kolin 1 hp inverter aircon as well, so I’d like to know how frequent you’ve been using yours. Like how many hours per day is it turned on? Just asking so I could get an estimation of how long the unit I’d buy would last for considering my intended hours of usage per day. Thanks!

      Reply

    • Oh and one more thing, what was the design of the AC you got from Kolin? Was it split type or window?

      Reply

  10. Hi Bob and Carol

    I have a samsung 1.5hp inverter cooling a 25sqm room for almost 6 years now and ive spent much on maintenance cleaning and part replacement and now as ive read on your post the circuit board needs replacement. I have been thinking of buying Daikin but im a little hesitant of how much would it cost me for the electricity a month as of now im paying 5k+ to 6k/month would it cost the same? Or much higher?

    Reply

    • Electrical consumption is based on so many individual variables it’s hard to be accurate. As we have stated we replaced a 1.5HP Samsung inverter with a 1HP Daikin conventional unit in a 25 SM bedroom. There really does not seem to be any increase in our bill. Our bill varies from about P3,500 to P6,000 but that includes a big refrigerator, a freezer, and an additional 2HP and 1HP air con which are used intermittently. I expect the standard units (all three of ours are standard R22 units) will require less maintenance and repair. In fact, non have required any repair, including 1 1HP Samsung which is six years old.

      Reply

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