58 registered models
Mitsubishi Heavy Industries split systems, as the register lists them.
1.5 kW to 10 kW, across 8 of the eight capacity classes. Sold as 122 variants once colourways and trim levels are counted, which is why a retailer's catalogue looks bigger than the register does.
Quick answer
58 distinct Mitsubishi Heavy Industries wall-mounted single-phase reverse-cycle air conditioners are registered with the Australian Government's GEMS database, ranging from 1.5 kW to 10 kW and covering 8 of the eight capacity classes the Australian market advertises. Across the range the best annual cooling efficiency figure is AEER 6.25 and the best heating efficiency figure is ACOP 5.63, with the lowest declared indoor noise level at 47 dB. Thunderman Electrical and Air Conditioning Services installs split systems across Greater Melbourne under ARCtick certification with electrical work by REC 28523, and advises on selection using the register rather than manufacturer marketing.
What the register says about this range
The honest summary.
The first thing worth knowing is that this is not the same company as Mitsubishi Electric. In Australia they are two separate manufacturers with separate ranges, separate warranties and separate distributor networks, and they are confused constantly — including in quotes. Once that is clear, the register says something interesting: Mitsubishi Heavy Industries holds both the highest cooling efficiency figure and the lowest indoor noise level of any model listed, and it covers all eight capacity classes despite carrying fewer distinct models than Daikin. If quiet running in a bedroom is the priority, this is the range the data points at.
Who this range suits
And who it doesn't.
This is the range to look at first if the unit is going in a bedroom, or in any room where someone will be trying to sleep, read or hold a conversation while it runs. It holds the lowest declared indoor noise level on the register and the highest cooling efficiency figure, which is an unusual pairing — quiet units are often quiet because they run a bigger, slower fan, and that usually costs efficiency somewhere. The catch is name confusion at the point of sale: ask a retailer for "Mitsubishi" and you may well be shown the other company's range, which is a different product with different figures.
Quietest in this range
Ranked by declared indoor noise.
| Model | Cooling | Heating | Indoor noise | AEER | ACOP | Stars | Registration |
|---|---|---|---|---|---|---|---|
| Mitsubishi Heavy IndustriesSRK20ZTA-WF+2 variants | 2 kW | 2.7 kW | 47 dB | 4.69 | 5.03 | 5 / 4 | AAC10044 |
| Mitsubishi Heavy IndustriesDXK_20+2 variants | 2 kW | 2.7 kW | 49 dB | 4.75 | 4.73 | 4 / 3.5 | AAC8734 |
| Mitsubishi Heavy IndustriesDXK06ZSA-WF+1 variant | 2 kW | 2.7 kW | 49 dB | 4.73 | 4.71 | 4 / 3.5 | AAC7741 |
| Mitsubishi Heavy IndustriesDXK06ZSA-WF1+1 variant | 2 kW | 2.7 kW | 49 dB | 4.73 | 4.71 | 4 / 3.5 | AAC8239 |
| Mitsubishi Heavy IndustriesSRK25ZTA-WF+2 variants | 2.5 kW | 3.2 kW | 50 dB | 4.34 | 4.53 | 5 / 3.5 | AAC10045 |
| Mitsubishi Heavy IndustriesDXK05ZTLA-W+3 variants | 1.5 kW | 2 kW | 51 dB | 4.03 | 4.53 | 1.5 / 3 | AAC7089 |
| Mitsubishi Heavy IndustriesDXK05ZTLA-WFJ | 1.5 kW | 2 kW | 51 dB | 4.09 | 4.58 | 2 / 3 | AAC8853 |
| Mitsubishi Heavy IndustriesDXK07ZTLA-W+3 variants | 2 kW | 2.7 kW | 52 dB | 3.76 | 4.08 | 2.5 / 3 | AAC7085 |
Cooling and heating are rated capacity. AEER andACOP are the annual efficiency figures for cooling and heating — higher is cheaper to run. Stars are shown as cooling / heating for a mixed climate zone, which is the one Melbourne sits in. Indoor noise is the manufacturer's declared sound level for the indoor unit. Every figure is as registered with the Australian Government's GEMS register, and the registration number is there so you can look it up yourself.
Most efficient — cooling
Ranked by AEER.
| Model | Cooling | Heating | Indoor noise | AEER | ACOP | Stars | Registration |
|---|---|---|---|---|---|---|---|
| Mitsubishi Heavy IndustriesSRK20ZSXA-W | 2 kW | 2.7 kW | 53 dB | 6.25 | 5.63 | 4.5 / 4 | AAC8729 |
| Mitsubishi Heavy IndustriesSRK20ZSXA-WF | 2 kW | 2.7 kW | 53 dB | 6.22 | 5.61 | 4.5 / 4 | AAC7747 |
| Mitsubishi Heavy IndustriesSRK25ZSXA-W | 2.5 kW | 3.2 kW | 55 dB | 5.56 | 5.33 | 4.5 / 4 | AAC8728 |
| Mitsubishi Heavy IndustriesSRK25ZSXA-WF | 2.5 kW | 3.2 kW | 55 dB | 5.54 | 5.32 | 4.5 / 4 | AAC7739 |
| Mitsubishi Heavy IndustriesDXK_25+2 variants | 2.5 kW | 3.2 kW | 53 dB | 4.79 | 4.84 | 3.5 / 3 | AAC8732 |
| Mitsubishi Heavy IndustriesDXK09ZSA-WF+1 variant | 2.5 kW | 3.2 kW | 53 dB | 4.78 | 4.83 | 3.5 / 3 | AAC7742 |
| Mitsubishi Heavy IndustriesDXK09ZSA-WF1+1 variant | 2.5 kW | 3.2 kW | 53 dB | 4.78 | 4.83 | 4 / 3 | AAC8237 |
| Mitsubishi Heavy IndustriesDXK_20+2 variants | 2 kW | 2.7 kW | 49 dB | 4.75 | 4.73 | 4 / 3.5 | AAC8734 |
Most efficient — heating
Ranked by ACOP, the figure Melbourne runs on.
| Model | Cooling | Heating | Indoor noise | AEER | ACOP | Stars | Registration |
|---|---|---|---|---|---|---|---|
| Mitsubishi Heavy IndustriesSRK20ZSXA-W | 2 kW | 2.7 kW | 53 dB | 6.25 | 5.63 | 4.5 / 4 | AAC8729 |
| Mitsubishi Heavy IndustriesSRK20ZSXA-WF | 2 kW | 2.7 kW | 53 dB | 6.22 | 5.61 | 4.5 / 4 | AAC7747 |
| Mitsubishi Heavy IndustriesSRK25ZSXA-W | 2.5 kW | 3.2 kW | 55 dB | 5.56 | 5.33 | 4.5 / 4 | AAC8728 |
| Mitsubishi Heavy IndustriesSRK25ZSXA-WF | 2.5 kW | 3.2 kW | 55 dB | 5.54 | 5.32 | 4.5 / 4 | AAC7739 |
| Mitsubishi Heavy IndustriesSRK20ZTA-WF+2 variants | 2 kW | 2.7 kW | 47 dB | 4.69 | 5.03 | 5 / 4 | AAC10044 |
| Mitsubishi Heavy IndustriesDXK_25+2 variants | 2.5 kW | 3.2 kW | 53 dB | 4.79 | 4.84 | 3.5 / 3 | AAC8732 |
| Mitsubishi Heavy IndustriesDXK09ZSA-WF+1 variant | 2.5 kW | 3.2 kW | 53 dB | 4.78 | 4.83 | 3.5 / 3 | AAC7742 |
| Mitsubishi Heavy IndustriesDXK09ZSA-WF1+1 variant | 2.5 kW | 3.2 kW | 53 dB | 4.78 | 4.83 | 4 / 3 | AAC8237 |
Sizes in this range
Where Mitsubishi Heavy Industries competes.
Compare with another brand
All figures from the GEMS registration database (Australian Government), covering 380 registered models across 8 brands. Every model above carries its registration number so you can check it atthe register.
Mitsubishi Heavy Industries air conditioners — common questions
How many Mitsubishi Heavy Industries split systems are sold in Australia?
58 distinct Mitsubishi Heavy Industries wall-mounted single-phase reverse-cycle models are registered with the Australian Government's GEMS database, sold as 122 variants once colourways and trim levels are counted separately. They span 1.5 kW to 10 kW and cover 8 of the eight capacity classes the Australian market advertises.
Is Mitsubishi Heavy Industries good for heating in Melbourne?
The best annual heating efficiency figure across the Mitsubishi Heavy Industries range on the register is ACOP 5.63, against 6.25 for cooling (AEER). In Melbourne the heating figure carries more weight, because a reverse-cycle system here runs for warmth far more of the year than for cooling. Those are the range's best figures, not typical ones — individual models vary, which is why the tables above list them separately rather than giving the brand a single score.
What is the quietest Mitsubishi Heavy Industries air conditioner?
The lowest declared indoor sound level in the Mitsubishi Heavy Industries range is 47 dB. Declared figures are measured by the manufacturer at a stated fan speed, so they compare fairly against other brands' declared figures but will not match what you measure in a room — mounting position and the surfaces around the unit change that considerably.
Does Thunderman install Mitsubishi Heavy Industries air conditioners?
Yiannis is ARCtick certified, which is what handling refrigerant legally requires, and installs split systems across Greater Melbourne regardless of brand. Which ranges he can supply directly depends on wholesaler arrangements, so the honest answer is to ask — and if a brand you want is one he cannot supply well, he will say so rather than talk you into something else. Electrical work is carried out under REC 28523.
Brand chosen. Now the part that decides whether it works.
Sizing against the actual room, whether the switchboard can carry it, and where the head should go. Yiannis quotes the whole job free of charge — ARCtick certified, REC 28523.