Large air conditioners review 2008

Keep your living room cool this summer.
 
Learn more
 
 
 
 
 
  • Updated:26 Aug 2008
 

01 .Introduction

Air conditioner

Test results for 10 air conditioners (with claimed capacities of around 7kW for cooling and 8kW for heating)

An ever-increasing number of Australians are getting air conditioning installed, or moving into a new home that delivers a cooling breeze at the touch of a button. The decade to 2005 saw air conditioner ownership in all Australian states and territories leap up. Overall, more than 60% of households now have a cooler.

For the environment and our energy grids, this trend is bad news. Growing use of air conditioning is increasing energy consumption and greenhouse gas emissions from fossil-fuel fired electricity generators, which are sent into overdrive to meet demand spikes on sizzling hot days.

It's therefore very important that people choose an efficient air conditioner (if they have to have one), to limit the negative effects on the environment — not to mention their own wallet.

We tested 10 large split-system, reverse-cycle inverter air conditioners with claimed capacities of around 7kW for cooling and 8kW for heating (suitable for large open-plan living areas). We assessed them for cooling and heating efficiency, airflow, and ease of use.

Please note: this information was current as of March 2009 and these models are now all discontinued. For more recent information, see our latest Large air conditioners review.

Models we tested

  • # Airwell XLV26 / GLV26
  • Carrier 42PQV080X / 38VYX080N
  • Fujitsu ASTA24LCC / AOTR24LCC
  • Haier HSU-26HO3 / R2 (DB)
  • Mistral MSS6.8INV
  • Mitsubishi Electric MSZ-GA71VA / MUZ-GA71VA
  • Mitsubishi Heavy Industries SRK63ZEA-S1 / SRK63ZE-S1
  • Mitsubishi Heavy Industries SRK71ZEA-S1 / SRC71ZE-S1
  • Panasonic CS-E24GKR / CU-E24GKR (A)
  • Toshiba RAV-SM802KRT-E / RAV-SM802AT-E

# The Airwell distributor ECP Australia went into administration in 2008. For those who purchased an Airwell product on or before 30th June 2007, warranties are no longer honoured. For warranty claims on Airwell products purchased on or after 1st July 2007, consumers should ring Seeley Products on (08) 8328 3866.
(A) About to be replaced by new model CS/CU-E24HKR. Availability check July 2008.

What else you'll get in this report

As well as the test results for 10 models, you'll get:

  • Information on the different types of air conditioners.
  • Tips on how to keep your home cool, and on what to keep in mind when installing an air conditioner.

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The following models scored the best results in our test.

What to buy
Brand Price
Mitsubishi Heavy Industries SRK63ZEA-S1 / SRK63ZE-S1 $1675
Mitsubishi Heavy Industries SRK71ZEA-S1 / SRC71ZE-S1 $1816
Panasonic CS-E24GKR / CU-E24GKR $2199
Fujitsu ASTA24LCC / AOTR24LCC $2699

Results table

Full results for all models are shown in the table below.

Cost Performance
Brand / model (in rank order) Yearly running cost ($) Price ($) * Overall Score (%) Cooling efficiency score (%) Heating efficiency score (%) Airflow score (%) Ease of use score (%) Noise indoor** / outdoor Measured cooling (kW) Measured heating (2°C outside) (kW) Rated heating (7°C outside) (kW)
Mitsubishi Heavy Industries SRK63ZEA-S1 / SRK63ZE-S1
www.mhi.net.au
280 1675 86 81 97 88 70 Quieter / Quieter 5.9 6.7 7.1
Mitsubishi Heavy Industries SRK71ZEA-S1 / SRC71ZE-S1
www.mhi.net.au
310 1816 80 82 77 86 75 Quieter / Quieter 6.8 6.6 8
Panasonic CS-E24GKR / CU-E24GKR (A)
www.panasonic.com.au
310 2199 75 75 80 71 70 Quieter / Quieter 6.7 7 8.6
Fujitsu ASTA24LCC / AOTR24LCC
www.fujitsugeneral.com.au
330 2699 74 78 67 77 76 Quieter / Quieter 6.9 7.1 8.5
Airwell XLV26 / GLV26 (B)
www.airwell.com.au
320 1617 73 78 72 66 65 Quieter / Quieter 6.8 6.6 7.1
Toshiba RAV-SM802KRT-E / RAV-SM802AT-E
www.toshiba-aircon.com.au
340 2000 69 71 69 63 73 Quieter / Quieter 6.4 6 8
Mitsubishi Electric MSZ-GA71VA / MUZ-GA71VA
www.mitsubishi-electric.com.au
380 2317 63 57 54 80 82 Quieter / Quieter 6.3 5.5 8.1
Carrier 42PQV080X / 38VYX080N
www.carrier.com.au
360 2009 62 63 59 62 68 Quieter / Medium 6.2 6.1 7.6
Haier HSU-26HO3 / R2 (DB)
www.haier.com.au
380 1150 60 52 63 73 60 Quieter / Quieter 6.5 6.1 8.1
Mistral MSS6.8INV
www.mistral.com.au
410 899 54 49 48 69 64 Noisier / Noisier 7 8 7.9
 


  Features Specifications
Brand / model (in rank order) Number of fan speeds Fast operation Quiet operation Fan-only mode Sleep mode Dimensions indoor unit (H x W x D; cm) Refrigerant
Mitsubishi Heavy Industries SRK63ZEA-S1 / SRK63ZE-S1
www.mhi.net.au
5 32 x 110 x 26 R410A
Mitsubishi Heavy Industries SRK71ZEA-S1 / SRC71ZE-S1
www.mhi.net.au
5 32 x 110 x 25 R410A
Panasonic CS-E24GKR / CU-E24GKR (A)
www.panasonic.com.au
7 28 x 91 x 24 R410A
Fujitsu ASTA24LCC / AOTR24LCC
www.fujitsugeneral.com.au
4 32 x 100 x 23 R410A
Airwell XLV26 / GLV26 (B)
www.airwell.com.au
3 29 x 101 x 23 R410A
Toshiba RAV-SM802KRT-E / RAV-SM802AT-E
www.toshiba-aircon.com.au
5 30 x 100 x 23 R410A
Mitsubishi Electric MSZ-GA71VA / MUZ-GA71VA
www.mitsubishi-electric.com.au
3 33 x 110 x 26 R410A
Carrier 42PQV080X / 38VYX080N
www.carrier.com.au
3 30 x 108 x 20 R410A
Haier HSU-26HO3 / R2 (DB)
www.haier.com.au
5 31 x 115 x 24 R410A
Mistral MSS6.8INV
www.mistral.com.au
3 32 x 104 x 22 R22
 

Table notes

Scores

The overall score is made up of:

  • Cooling efficiency: 40%
  • Heating efficiency: 30%
  • Airflow: 20%
  • Ease of use: 10%

We weighted cooling efficiency more highly than heating efficiency because reverse-cycle air conditioners are more often used for cooling than heating in Australia.

(A) About to be replaced by new model CS/CU-E24HKR
(B) The Airwell distributor (ECP Australia) went into administration in 2008. For those who purchased an Airwell product on or before 30th June 2007, warranties are no longer honoured. For warranty claims on Airwell products purchased on or after 1st July 2007, consumers should ring Seeley Products on (08) 8328 3866.
* Recommended or average retail price, as of July 2008.
** Lowest fan setting.

How we tested

  • To determine their cooling and heating efficiency, our testers operated the air conditioners continuously at their maximum thermostat and fan settings.
  • The results are a worst-case efficiency scenario for inverter models, as most of the time they’ll run at lower than their maximum capacity.
  • The testers used the test room and climate conditions in the Australian Standard, measuring and rating the cooling/heating output (in kW) per kW of power used.
  • In addition, they measured the units’ cooling efficiency at 50% of the measured capacity.
  • The testers measured the indoor airflow (in litres per second) on the highest and lowest fan settings.
  • They assessed the ease of use of the remote controls, instruction manuals and timers, as well as the ease of removing and refitting the air filters for cleaning.
  • The testers measured the noise levels of the indoor unit with the fan on the lowest possible setting, and of the outdoor unit while it was installed in our test room.

Measured capacity

Reverse-cycle air conditioners are sold with rated heating and cooling capacities — you choose one based on the cooling and heating capacity required for your room(s). Shown in the table is the highest capacity we measured for cooling, and for heating at 2C, plus the rated heating capacity at 7C.

Yearly running costs

We calculated how much each model costs to deliver 3000 kWh of cooling (1500kWh at full capacity and 1500kWh at part capacity) and 3000 kWh of heating per year (based on electricity costs of 15 cents/kWh).

We didn’t include standby costs (for power used when the air conditioner is plugged in but not operating), as based on previous tests they’re likely to be only a few dollars a year. It may still be a good idea to unplug your air conditioner (if possible) when it’s not in use for long periods of time.

Profiles - what to buy

Mitsubishi Heavy Industries SRK63ZEA-S1 / SRK63ZE-S1

Mitsubishi heavy Industrys SRK63ZEA-S1/SRK63ZE-S1 Price: $1675

Good points

  • Very good cooling efficiency.
  • Excellent heating efficiency.
  • Very good airflow range.
  • Comparatively low yearly running cost.

Bad points

  • None to mention.

Mitsubishi Heavy Industries SRK71ZEA-S1 / SRC71ZE-S1

Mitsubishi Heavy Industries SRK71ZEA-S1/SRC71ZE-S1 Price: $1816

Good points

  • Very good cooling efficiency.
  • Good heating efficiency at low outdoor temperatures.
  • Very good airflow range.

Bad points

  • None to mention.

Panasonic CS-E24GKR / CU-E24GKR

Panasonic CS-E24GKR/CU-E24GKR Price: $2199

Good points

  • Good cooling efficiency.
  • Very good heating efficiency at low outdoor temperatures.
  • Good airflow range.

Bad points

  • No fan-only mode.
  • No sleep mode.

Fujitsu ASTA24LCC / AOTR24LCC

Fujitsu ASTA24LCC/AOTR24LCC Price: $2699

Good points

  • Good cooling efficiency.
  • Good airflow range.

Bad points

  • No Fast operation.


 

Profiles - the rest

Airwell XLV26/GLV26

Airwell XLV26/GLV26 Price: $1617

Good points

  • Good cooling efficiency score.

Bad points

  • Comparatively more difficult to use.
  • The Airwell distributor (ECP Australia) went into administration in 2008. For those who purchased an Airwell product on or before 30th June 2007, warranties are no longer honoured. For warranty claims on Airwell products purchased on or after 1st July 2007, consumers should ring Seeley Products on (08) 8328 3866.

Carrier 42PQV080/38VYX080N

Carrier 42PQV080/38VYX080N Price: $2009

Good points

  • None to mention.

Bad points

  • Comparatively poor cooling and heating efficiency.
  • Comparatively expensive to run.
  • Limited airflow range.
  • Comparatively difficult to use.

Haier HSU-26HO3/R2 (DB)

Haier HSU-26HO3/R2 (DB) Price: $1150

Good points

  • Has many features.

Bad points

  • Varying temperature in part-load test.
  • Substantial difference between claim and measured heating capacity.

Mistral MSS6.8INV

Mistral MSS6.8INV Price: $899

Good points

  • None to mention.

Bad points

  • Uses R22 as a refrigerant, an ozone depleting agent.
  • Highest yearly running cost.
  • Noisiest air conditioner on test.
  • Lowest overall score.

Mitsubishi Electric MSZ-GA71VA/MUZ-GA71VA

Mitsubishi Electric MSZ-GA71VA/MUZ-GA71VA Price: $2317

Good points

  • Very easy to use.
  • Very good airflow score.

Bad points

  • Comparatively poor cooling and heating efficiency.
  • Comparatively expensive to run.
  • Substantial difference between claim and measured heating capacity.
  • No fan-only mode.

Toshiba RAVSM802KRTE/RAVSM802ATE

Toshiba RAVSM802KRTE/RAVSM802ATE Price: $2000

Good points

  • Many features.

Bad points

  • Limited airflow range.
  • Size/capacity - To get the most from an air conditioner, match its cooling (and, if required, heating) capacity to your room. Use the CHOICE cooling and heating calculators to determine the right size for your home.
  • Energy efficiency - Once you’ve worked out what capacity you need, compare the star ratings of models of similar capacity — the more stars the better. Note that star ratings are different for heating and cooling — see the picture and caption, below, for more on this.
  • Automatic de-icing - If you live in a cold area, frost may build up on the outdoor heat exchanger coils in winter if the air conditioner doesn’t have this function (all the tested ones do).

Energy ratings

Energy ratingThere are two types of energy efficiency label for reverse cycle air conditioners. The star rating for heating always refers to heating at 7°C outdoor temperature and cooling at 35°C. The ‘all options’ label pictured also lists the product’s heating capacity at 2°C outdoor temperature. The higher the number of stars, the more efficient the model (efficiency is calculated by dividing the output capacity by the input power).

Larger capacity models (more than 2.4 kW of input power) can’t be plugged into a normal power point but need a special connection.

Variable output compressor: ‘no’ means conventional (on or off), ‘yes’ means inverter.

Common features

Unless it’s stated otherwise, all the air conditioners tested have the following features:

  • A timer lets you switch the air conditioner on and/or off automatically at certain times.
  • All the tested models have one, but they are not always as good as they should be. Ideally it should indicate status and settings at all times. It’s difficult to see the settings on the Airwell and Carrier. All of the models (except the Mistral) have a real time clock which makes it easy to set on/off times.
  • Most models (except the Mitsubishi Electric and Panasonic) also have a sleep or a ‘one-hour-off’ timer.
  • Remote control.
  • Operating modes
    Auto - Automatically chooses the mode required to keep the room at the chosen temperature.
    Cool - Pumps heat from the inside to the outside.
    Heat - Pumps heat from the outside to the inside.
    Dry - Dehumidifies the air (while cooling only slightly).
    Fan only Blows air without heating, cooling or drying. This can be useful when it’s not hot enough to justify running the air conditioner and all you want is a bit of a cooling breeze. In our test, all except the Fujitsu, Panasonic and Mitsubishi Electric have this function.
  • Some models have settings with reduced noise (quiet operation) and/or extra-high power (fast or jet operation). See Results table.
  • A sleep mode adjusts the temperature in several steps (up when cooling, down when heating) so the air conditioner doesn’t have to work as hard — or as loudly — when you’re sleeping. You can set the sleep mode for as long as you like. See the table for which models have this feature.
  • Adjustable louvres allow the air to be distributed more evenly — point them up for cool air and down for warm. All models in this test let you do this with the remote control, and they have auto-swing. You can also manually adjust the vertical louvres on the Haier and horizontal louvres on the Airwell, Carrier, Haier, Mistral and Toshiba; on the rest you adjust them with the remote control which is the better option.
  • Restart delay This protective feature prevents the air conditioners from starting up again too soon after being switched off.

Other ways to keep cool

Before you fork out for a large air conditioner to keep the approaching summer heat at bay, consider all the other options that might cool you down sufficiently without costing the earth — insulating your home, shading and draught-proofing doors and windows, installing blinds, curtains or awnings, planting deciduous trees outside windows or glass doors, and, perhaps, reducing your air conditioner use in the car — they say if you’re less used to being cool in the car, you’re less likely to demand it at home.

We've previously reported on two other cooling options. Ceiling fans use up far less energy than air conditioners and make you feel cooler without reducing the room temperature. A portable air conditioner lets you cool one room at a time, but it’s clunky, hard to operate and not particularly energy-efficient.

If you must buy a large air conditioner for those scorching days where temperatures are sky-rocketing, choose one that’s just as efficient at keeping you warm next winter.

When it’s cold outside

In many areas of Australia, winter evenings can get much colder than 7ºC, which is the outdoor temperature we used in the past to test the air conditioners’ heating efficiency, in line with the tests for the energy label. So this year we decided to conduct our tests at the lower outdoor temperature of 2ºC — also according to the standard — to see how the different models cope with these tougher conditions.

As could be expected, the air conditioners were generally less efficient at the lower outdoor temperature than at 7ºC. At 2ºC the heat exchange coils in an outdoor unit tend to frost up, so the air conditioner has to defrost them before indoor heating can resume.

These defrost cycles generally lower the units’ claimed heating capacity by up to about 30% and their claimed efficiency by about a quarter to a third. The Mitsubishi Heavy Industries SRK63 was the most efficient at heating; three others (see results table ) scored above 70% for heating efficiency — one of these models would be best if you live in a cold area.

Factors to consider

  • Split systems consist of an outdoor unit that sits outside your home and contains all the noisy bits needed to condition the air, plus an indoor unit (or several) that’s connected by a hose and installed on a wall to blow the conditioned air into your room. They’re more efficient and less noisy than cheaper, window/wall units.
  • Inverter air conditioners, like the ones in this test, can vary their heating or cooling output to correspond to room conditions. This is more energy-efficient than older models, which essentially have two settings: 100% of their capacity or ‘off’.
  • Efficiency - This tells you how many kilowatts (kW) of cooling or heating an air conditioner provides per kW of electricity it uses. The more stars on the energy label, the more efficient it is and the lower the running costs and greenhouse gas emissions.
    Of the models on test, Mitsubishi Heavy Industries SRK71 had the best cooling efficiency at part load, whereas the Mitsubishi Heavy Industries SRK63 had the best cooling efficiency at full load, making these two models the best for cooling overall. See How we tested for a description of full and part load testing. The next best for cooling efficiency were the Fujitsu and Airwell. The best for heating efficiency were the Mitsubishi Heavy Industries SRK63 and the Panasonic.
  • Airflow - The air conditioner’s fan circulates the cooled (or heated) air around the room. Ideally, you want a model with a wide airflow range (multiple fan speeds): from very high to help the room cool down quickly, to very low so there’s less noise and no unpleasant draught once you have the right temperature. Our tests found both Mitsubishi Heavy Industries models and the Mitsubishi Electric have the best combination of high and low fan settings. The Mitsubishi Heavy Industries SRK63 has the most powerful maximum fan setting, which helps cool or heat a room quickly. These three models also have a ‘low fan’ setting with comparatively little airflow, so you’re more likely to find a setting that doesn’t feel like you’re sitting in a wind tunnel, while still moving some air about.
  • Noise - A noisy indoor unit may interfere with your conversation, entertainment or sleep. And most local councils have noise restrictions relating to the use of air conditioners: check before you buy, especially if the outdoor unit has to be installed close to your neighbour. We tested the noise in the air conditioners’ quietest modes and found most models to be similarly quiet, apart from the Mistral which was noisy both indoors and outdoors.
  • Ease of use - The Mitsubishi Electric scored very well for ease of use; the Haier ranked lower than the rest. There’s not much difference between the rest.

05.Types / Installation

 

Air conditioners

  • Some portable models are little more than personal coolers. Others can cool a small room (up to about 20 square metres). Portable units can be plugged into a normal power point. Expect to pay around $800 to $3000.
  • A wall/window model is usually installed in a window or external wall, and can cool rooms and open-plan areas of up to 50 square metres. While smaller units can be plugged into a normal power point, larger ones may require additional wiring. Prices range from about $500 to $3500.
  • A split-system air conditioner consists of a compressor unit that's installed outside, and one or more indoor air outlets. They're usually used to cool one or more rooms, or an open-plan area, of up to 60 square metres. They cost around $1200 to $5000.
  • A ducted system  is usually installed in the roof or outside on the ground, and ducted to air outlets throughout the house. Costs start from $5000.
  • Inverter technology: With conventional air conditioners, the compressor is either on (working to 100% capacity) or off. Inverters can vary the compressor speed and maintain the set temperature within a narrow range. Manufacturers claim inverter models are more efficient and reduce running costs.
  • Cooling-only or reverse cycle: Reverse-cycle models only cost a bit more than cooling-only models, but you can also use them for heating in winter. While the purchase and installation costs can be high, reverse-cycle air conditioners are among the cheapest forms of heating to run. They cause less carbon dioxide to be produced in power plants burning fossil fuel than other kinds of electric heater.

Evaporative coolers

If you live in a hot and dry climate, an evaporative cooler can be a cheaper alternative to an air conditioner. Evaporative air coolers draw the hot air over a water reservoir. The water evaporates, absorbing heat from the air. The cooler, moist air is then blown into the room. Evaporative coolers are generally more suitable for areas with low humidity. The more humid the outside air, the lower the cooling effect you can expect .

Installation

  • You can buy a split-system air conditioner from air conditioner retailers (look up — Air Conditioning / Home or Air Conditioning / Installation & Service, in the Yellow Pages), most electrical appliance retailers and some department stores. Most traders offer supply and install packages, and some installation only.
  • Installation of a split-system air conditioner generally costs at least $500, depending on the model and your situation. Get several quotes.
  • Cool air is heavier than warm air. So, for optimum cooling, the air outlet should be installed as close to the ceiling as possible, with the louvres pointing horizontally or upward. That way the cool air can spread out, drop down and cool the whole room; for heating, point the louvres downwards.
  • It’s generally better to install an air conditioner on a longer wall of a room, but your installer should recommend the best place for your situation.
  • Air conditioners can be noisy, so think about your neighbours when deciding where to install the outdoor unit. Check with your local council whether there are regulations on acceptable noise limits where you live.
  • The outdoor unit of your split system needs to be installed on a firm base (for example, a concrete slab) or attached to a wall, using sturdy brackets. It should be as close as possible to the indoor air outlet, preferable 15 m or less away.
  • Shade the outdoor part of your air conditioner from direct sunlight — for example, by installing it on a southern wall or providing an awning.
  • Larger air conditioners than the models in this test can’t be plugged into a regular power point, but require a special connection.

06.Cooling and heating tips

 

Whether or not you have an air conditioner, these tips will help you keep warm this winter and cool next summer (and if you do have one, it won’t have to work as hard).

General

  • The first step’s insulating your ceilings (and walls if possible).
  • Draughtproof your home.
  • Sensible clothing: Put on an extra jumper in winter rather than heat your home to a tropical temperature, and wear light clothing made from natural fibres in summer.
  • Contact your state or territory energy information centre for more tips.

Heating

  • Close the doors between heated and unheated rooms.
  • Only heat the rooms you're actually using.
  • For more information see Your heating options

Cooling

  • Shading for east, north and west-facing windows helps prevent the sun’s heat from entering your home; outside shading is more efficient than internal blinds or curtains.
  • Try fans for a cooling effect.
  • Avoid activities that produce heat during the day.
  • For more information see Your cooling options

Warm House Cool House bookIn addition to the information on this site, you can find out more about keeping your home at a comfortable temperature using energy-efficient strategies in the CHOICE Book, Warm House, Cool House.

Use our calculator below as a guide to what you need.

Air conditionerAccording to our survey, wall/window units are the most reliable air conditioner, with only 4% needing repair in the year before the survey, and ducted air conditioners the least reliable, with 15% needing repair in this period.

In terms of reliability, there’s not much difference between most brands, with the exception of Carrier, which may have you calling the repairer more frequently. No big brand names had any standout problems, but when we grouped together all the ‘other’ brands (those for which we had insufficient responses to report on by individual brand), we found they tended to have problems with their compressor (4%), controls (4%) and fan (3%). So it might be worth sticking with the brands in the table.

Owners of Daikin, Mitsubishi, Fujitsu and Panasonic said they’d be likely to buy the same brand again, while LG and Carrier owners were the least likely to stick with the same brand. One in eight LG owners said they wouldn’t buy an LG air conditioner again because they’re too noisy.  

Is your main air conditioner an inverter model?
Percentage not needing repairs in the 12 months prior to the survey*
Yes (2367) 91
No (1568) 88
 

*These figures have been adjusted for the age of the appliances.
There is a significant difference in the two repair rates.
The figure in brackets is the number of subscribers reporting on this brand bought in or after 2000.


Air conditioners by type
Percentage not needing repairs in the 12 months prior to the survey*
Wall/window unit (465) 96
Split system (3416) 91
Ducted (1073) 85
All air conditioners (4954) 90

*These figures have been adjusted for the age of the appliances.
Differences of 5% or more are statistically significant.
The figure in brackets is the number of subscribers reporting on this brand bought in or after 2000.


Percentage not needing repair
All air conditioners (5018) 90
Mitsubishi (493) 96
Electrolux/Kelvinator (144) 95
Panasonic (552) 93
Fujitsu (789) 92
Daikin (1283) 92
LG (362) 90
Carrier (199) 86

The figure in brackets is the number of subscribers reporting on this brand purchased in or after 2000.
These figures have been statistically adjusted for the age of the appliances.
Differences of 5% or more are statistically significant.


Percentage who would buy the same brand again
All air conditioners (5058) 87
Daikin (1296) 97
Mitsubishi (492) 94
Fujitsu (802) 93
Panasonic (555) 92
Electrolux/Kelvinator (148) 80
LG (362) a 79
Carrier (202) 76
The figure in brackets is the number of subscribers reporting on this brand purchased in or after 2000.
a) A higher than average number of respondents who wouldn't buy LG again (57%) gave their reason for not buying again as 'Noise.'