2.5kW split systems: what they cost to buy and to run
Supplied and installed, a 2.5kW split system costs $1,603 to $2,388, GST included. Below are all 23 we install, cheapest to run first. Picking the cheapest to run saves up to $55 a year.
Every 2.5kW split system we install
Yearly cost to cool and heat, at the middle price of Sydney power plans (33.13c a kWh, including GST).
| Model | Size | Stars | Noise | Price installed | Cost a year | Add to quote |
|---|---|---|---|---|---|---|
 1ActronAir Serene 2.6kWWRE‑026DS | 2.63 kW cooling2.7 kW heating | 6.5 cooling3.5 heating | 57 dB inside64 dB outside | $1,868to $1,949 | $134$44 cooling, $90 heating | |
 2Rinnai PB Series 2.6kWHSNRP26B | 2.65 kW cooling2.7 kW heating | 5.5 cooling3.5 heating | 55 dB inside58 dB outside | $1,603to $1,763 | $140$49 cooling, $91 heating | |
 3Carrier Indigo 2.5kW42QAG026N8 / 38QAG026N8 | 2.65 kW cooling2.75 kW heating | 6 cooling3.5 heating | 55 dB inside58 dB outside | $1,758to $1,868 | $141$48 cooling, $93 heating | |
 4Daikin Alira X 2.5kWFTXM25AVMA / RXM25AVMA | 2.5 kW cooling3.2 kW heating | 5.5 cooling4 heating | 57 dB inside59 dB outside | $2,088to $2,198 | $148$46 cooling, $102 heating | |
 5Rinnai T Series 2.5kWHINRT25B / HONRT25B | 2.64 kW cooling2.9 kW heating | 7 cooling3 heating | 54 dB inside59 dB outside | $1,699to $1,773 | $154$41 cooling, $113 heating | |
 6MHI Avanti Plus 2.5kWSRK25ZSXA‑WF | 2.5 kW cooling3.2 kW heating | 4.5 cooling4 heating | 55 dB inside57 dB outside | $2,248to $2,388 | $161$55 cooling, $106 heating | |
 7=Mitsubishi Electric MSZ-LN 2.5kWMSZ‑LN25VG | 2.5 kW cooling3.2 kW heating | 4.5 cooling3.5 heating | 54 dB inside56 dB outside | $1,989to $2,089 | $163$53 cooling, $110 heating | |
 7=Mitsubishi Electric MSZ-AP 2.5kWMSZ‑AP25VGKD2 | 2.5 kW cooling3.2 kW heating | 5.5 cooling3 heating | 56 dB inside56 dB outside | $1,758to $1,868 | $163$47 cooling, $116 heating | |
 9Fujitsu Lifestyle 2.5kWASTG09KMTC | 2.5 kW cooling3.2 kW heating | 5 cooling3 heating | 55 dB inside55 dB outside | $1,868to $1,878 | $167$51 cooling, $116 heating | |
 10Daikin Cora 2.5kWFTXV25WVMA / RXV25WVMA | 2.5 kW cooling3.2 kW heating | 5.5 cooling3 heating | 58 dB inside59 dB outside | $1,868to $1,978 | $168$48 cooling, $120 heating | |
 11Panasonic RZ 2.5kWCS‑RZ25XKR / CU‑RZ25XKR | 2.5 kW cooling3.0 kW heating | 4 cooling3 heating | No figure | $2,138to $2,228 | $175$58 cooling, $117 heating | |
 12=MHI Avanti 2.5kWDXK09ZSA‑WF1 | 2.5 kW cooling3.2 kW heating | 4 cooling3 heating | 53 dB inside58 dB outside | $2,088to $2,228 | $178$58 cooling, $120 heating | |
 12=Panasonic Z Series 2.5kWCS‑Z25AKRW | 2.5 kW cooling3.0 kW heating | 4 cooling3 heating | 56 dB inside63 dB outside | $2,138to $2,228 | $178$60 cooling, $118 heating | |
 14LG DUALCOOL AI 2.5kWAS09S0N/AS09S0U | 2.5 kW cooling3.0 kW heating | 4.5 cooling2.5 heating | 59 dB inside56 dB outside | $1,698to $1,788 | $180$56 cooling, $124 heating | |
 15=Fujitsu Comfort 2.5kWASTH09KNCA | 2.5 kW cooling3.2 kW heating | 4.5 cooling3 heating | 59 dB inside62 dB outside | $1,868to $1,979 | $182$57 cooling, $125 heating | |
 15=Hisense J-Series 2.5kWHAWJ9KR | 2.5 kW cooling3.1 kW heating | 4 cooling3 heating | 59 dB inside60 dB outside | $1,698to $1,788 | $182$59 cooling, $123 heating | |
 15=Samsung AI Smart AIRISE WindFree 2.5kWAR09BXECNWKNSA / AR09BXECNWKXSA | 2.5 kW cooling3.2 kW heating | 4.5 cooling3 heating | 54 dB inside60 dB outside | $1,988to $2,099 | $182$56 cooling, $126 heating | |
 18=Daikin Lite 2.5kWFTXF25WVMA | 2.5 kW cooling3.0 kW heating | 4 cooling2.5 heating | 56 dB inside59 dB outside | $1,813to $1,923 | $183$59 cooling, $124 heating | |
 18=MHI Ciara 2.5kWDXK09ZTLA‑WF | 2.5 kW cooling3.0 kW heating | 3 cooling3 heating | 55 dB inside58 dB outside | $2,058to $2,188 | $183$67 cooling, $116 heating | |
 20Samsung Aero 2.5kWAR09DXFZCWKNSA / AR09DXFZCWKXSA | 2.5 kW cooling3.2 kW heating | 4.5 cooling3 heating | 54 dB inside60 dB outside | $1,988to $2,099 | $184$57 cooling, $127 heating | |
 21Daikin Zena 2.5kWFTXJ25T2VMAW / FTXJ25T2VMAK | 2.5 kW cooling3.2 kW heating | 3.5 cooling3 heating | 56 dB inside59 dB outside | $2,199to $2,299 | $187$63 cooling, $124 heating | |
 22TCL BreezeIN 2.0 2.6kWTAC‑10CHSD/VFIH | 2.64 kW cooling3.3 kW heating | 4.5 cooling3 heating | 54 dB inside63 dB outside | $1,689to $1,743 | $188$58 cooling, $130 heating | |
 23Mitsubishi Electric MSZ-EF 2.5kWMSZ‑EF25VG | 2.5 kW cooling3.2 kW heating | 4 cooling2.5 heating | 53 dB inside55 dB outside | $1,989to $2,089 | $189$60 cooling, $129 heating |
Source: Australian GEMS registry · median of 170 Sydney residential tariffs, including GST · Refreshed monthly · Last updated November 2026. Stars are for the energy label’s average climate zone, which includes Sydney. Noise is the sound level on the energy label, in decibels. Mitsubishi Electric makes the MSZ-LN, the MSZ-AP and the MSZ-EF. Mitsubishi Heavy Industries (MHI in the table) makes the Avanti Plus, the Avanti and the Ciara. They are two different companies.
What the numbers mean
More heating output, more energy a year
Heating output here runs from 2.7 to 3.3 kW. On the energy label, a unit with more output also uses more energy over a year, even when it is just as efficient. To compare efficiency, look at the stars: more stars, less energy for the same job.
How loud they are
Lower is quieter. On the energy label, the indoor units here range from 53 to 59 decibels and the outdoor units from 55 to 64. For the indoor unit, brochures often print a different measure (sound pressure), which reads lower than the label.
Cost for an hour
At the size in the table, these units cost 15c to 21c an hour to cool and 17c to 26c an hour to heat. That is at 33.13c a kWh. For your bill, the yearly figures in the table are the better guide.
Western Sydney and Wollongong
Western Sydney and Wollongong are on a different power network, Endeavour Energy. The middle price there is 31.02c a kWh, including GST. The same units cost $125 to $177 a year there.
A 2.5kW cools up to about 18 to 21 m²
That is a bedroom or a study: up to 21 m² if the room faces north and 18 m² if it faces east, insulated, in the Mitsubishi Heavy Industries sizing chart. West-facing windows, high ceilings and poor insulation mean you need more.
For a bigger room, compare 3.5kW split systems.
Prefer nothing on the wall? We also install 2 cassette systems, 1 bulkhead / slim duct unit and 1 floor console unit in this size.
What sets the installed price
- The length of pipe between the indoor and outdoor units. This changes the price most.
- Access: a second storey, a wall bracket up high, the wall the pipe goes through.
- Your switchboard and power supply.
The government register lists 22 of these 23 units as single-phase and none as three-phase. The installation cost guide covers each item. We give you a fixed price in writing before any work starts.
2.5kW split systems, answered
How much does a 2.5kW split system cost installed?
Supplied and installed, a 2.5kW split system costs $1,603 to $2,388, GST included. The cheapest to buy is the Rinnai PB Series 2.6kW, from $1,603. That is for a standard back-to-back install, with the outdoor unit on the ground and up to 5 metres of pipe. A wall bracket for the outdoor unit, a longer pipe run or a roof mount costs extra, and we confirm your price in writing before any work starts.
How much does a 2.5kW split system cost to run in Sydney?
A 2.5kW split system here costs $134 to $189 a year to cool and heat. That is at the middle price of Sydney power plans (33.13c a kWh, including GST). The cheapest to run is the ActronAir Serene 2.6kW. Your own bill depends on how many hours you use it and on your power plan.
Is a 2.6 kW split system the same as a 2.5kW?
Yes, for choosing a size. 20 of the 23 units here are rated 2.5 kW. The other 3 are rated 2.6 kW, and this page lists them all.
What size room will a 2.5kW air conditioner cool?
Up to about 21 m² in an insulated room that faces north, or 18 m² if it faces east, in the Mitsubishi Heavy Industries sizing chart. West-facing windows, high ceilings or poor insulation mean you need more, so size your room before you choose.
How loud is a 2.5kW split system?
On the energy label, the indoor units here range from 53 to 59 decibels and the outdoor units from 55 to 64. Lower is quieter. The quietest indoor units are the MHI Avanti 2.5kW and the Mitsubishi Electric MSZ-EF 2.5kW, both at 53 decibels.
How much does a 2.5kW split system cost installed?
It depends on the job. The length of pipe between the indoor and outdoor units, access (a second storey, a wall bracket up high) and your switchboard all change the price. Our installation cost guide explains each one. Ask for a quote and you get a fixed price in writing first.
Guides & advice
Buying guideTypes of air conditioners, and who each one suits
You'll often hear it comes down to split or ducted, but there are six types of air conditioners for a home. Here's where each one goes and who it suits.
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Buying guideWhat size air conditioner do I need? Room size to kW
Air conditioner size is measured in kilowatts, not the physical box on the wall, and getting it right is the difference between a system that quietly keeps up and one that costs more and never feels comfortable. Here is how to go from your room to a sensible kW range, what shifts that number, and how we size it against real systems.
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Buying guideThe quietest split systems at each size, from the energy label
At 7 kW, the quietest split system we install is 10 decibels quieter on its energy label than the cheapest to run. That's half as loud, for $37 a year more. Here's the quietest at every size, why brochures print a lower number, and the NSW hours for your neighbours.
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Let’s get your place comfortable.
Free fixed-price quotes in writing before any work starts, and a local team that turns up when they say they will.