3.5 kW split systems
265
models on the register
Short answer
265 3.5 kW split systems are registered for sale in Australia in 2026, from 3.2 to 3.7 kW. Supplied and installed, most land between $1,700 to $2,700; up to three licensed local installers will quote your actual job.
Prices are estimates, not quotes (how we estimate them). Rebate rules checked September 2026.
Compare 3 quotes for my houseA 3.5 kW split cools a standard insulated room of up to about 29 m². In a sunny west-facing room that drops to about 25 m², and with poor insulation as well, about 21 m². It is the right size for a large main bedroom, a study that bakes in the afternoon, or a closed lounge in a brick veneer house.
The register lists 265 models at this size from 26 brands, almost all rated at 3.5 kW exactly. The tables below list every one. Here is what separates them.
At a glance
- Models265from 26 brands
- Installed, estimate$1,700–$2,700
- Quietest indoorsBonaire CRC691113547.7 dB(A), 3.5 kW
- Most efficient (average zone)ActronAir WRE-035DS6 cooling stars, 3.5 kW
- Reverse cycle91%heat and cool
- R32 refrigerant99%the current low-GWP standard
3.5 kW
265 models · installed $1,700–$2,700
| Brand | Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|---|
| ActronAir | WRC-035DS / WRE-035DS | Wall split | 3.5 | 3.9 | 6★ | 3.5★ | 58.8 | $1,700–$2,700 | Get quotes |
| Midea | MFEP35VB-W/MFEP35VB-N | Wall split | 3.5 | 3.9 | 6★ | 3.5★ | 58.8 | $1,700–$2,700 | Get quotes |
| Haier | 1U35MAEFRA / AS35QCEHRA | Wall split | 3.5 | 3.7 | 6★ | 3★ | 62.8 | $1,700–$2,700 | Get quotes |
| Westinghouse | HSV127HWAE/HSV127HWAI +2 variants with the same ratings | Wall split | 3.6 | 4.4 | 5.5★ | 3★ | 51.3 | $1,700–$2,700 | Get quotes |
Every model on the Energy Rating register marked available in Australia. Stars are the zoned label for the average climate zone (average zone); indoor noise is the registered sound power level, measured the same way for every model. Installed prices are estimated 2026 supply-and-install ranges, not quotes (how we estimate them); your installer confirms the number. Browse and filter everything in the full catalogue.
Should I get a 2.5 kW or a 3.5 kW split system?
If the room is over about 20 m², or it has western sun, take the 3.5 kW. It is usually only a few hundred dollars more and gives headroom on the few days a year when it matters. If the room is a normal bedroom under 16 m², the 2.5 kW is quieter and rates better.
| Size | Standard room up to | Room with big west glass | Installed, typical | Cooling stars (median) | Indoor dB(A) (median) |
|---|---|---|---|---|---|
| 2.5 kW | about 20 m² | about 18 m² | $1,500 to $2,500 | 5.0 | 54.5 |
| 3.5 kW | about 29 m² | about 25 m² | $1,700 to $2,700 | 4.5 | 57.0 |
| 5.0 kW | about 42 m² | about 35 m² | $2,100 to $3,300 | 3.5 | 60.0 |
Not sure which side of the line you're on? The size calculator takes a minute.
What to look for in a 3.5 kW split
- Cooling stars for your zone. The median reverse cycle 3.5 kW rates 4.5 stars in the average zone and the best rate 6.
- Heating stars if you're in a cold zone. The top cold-zone heating rating at this size is 3 stars, and 51 models share it, 28 of them Mitsubishi Electric. The median is 2.5.
- Noise, if it's a bedroom. The quietest 3.5 kW units register 47.7 dB(A) and the median is 57. That spread is worth checking.
- Reverse cycle. 242 of the 265 models heat as well as cool.
How much does a 3.5 kW split system cost installed?
Typically about $1,700 to $2,700 supplied and installed in 2026, as an estimate for a standard single-storey job. A value brand on a simple wall sits near the bottom and premium brands toward the top. A long pipe run or an upstairs room adds to it, and a new circuit is about $300 to $900, or $1,000 to $3,500 for a switchboard upgrade, if your board needs it. Our how-to-size guide covers whether 3.5 kW is right for the room.
The fastest way to a fair number is to get up to three local quotes for the same size and compare the inclusions. The split system cost guide explains the usual extras.
FAQ
3.5 kW split systems: common questions
What size room will a 3.5 kW air conditioner cool?
Up to about 29 m² in a standard insulated room with average sun, about 25 m² with big west-facing glass, and about 21 m² if the room also has poor insulation. That is a large bedroom or a closed lounge.
Is a 3.5 kW split system enough for a living room?
Is a 3.5 kW split too big for a bedroom?
Not if the bedroom is over about 20 m² or gets afternoon sun. In a small, shaded bedroom it can short-cycle and leave the air a bit clammy, and a 2.5 kW is the better fit. Inverter units cope with a little oversizing better than old fixed-speed ones. If you're unsure, get up to three local quotes and have each installer size the room.
How much does a 3.5 kW split system cost installed?
Typically $1,700 to $2,700 supplied and installed in 2026, depending on size and the job. 3.5 kW: $1,700 to $2,700. Pipe runs, a new circuit or a second storey add to it. Get up to three local quotes for your actual job.
Which is the quietest 3.5 kW split systems?
On the registered indoor sound level, the Bonaire CRC6911135 (3.5 kW) is the quietest at 47.7 dB(A). Compare within the same size: bigger units are louder. See the quietest split systems ranking.
Which is the most energy efficient?
For the average climate zone, the ActronAir WRE-035DS (3.5 kW) has the highest cooling rating here at 6 stars. Star ratings on the zoned label run to 10, and a star is worth more in a hot zone than a mild one. For cold-climate heating, the ActronAir WRE-035DS leads at 3 stars.
What size split system do I need?
Roughly 2.5 kW for a bedroom, 3.5 kW for a large bedroom or small living room, and 5 to 7.1 kW for open-plan living. West glass and poor insulation push it up. Use the size calculator for your room.
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