Temperzone 22.5 kW ducted system
$12,000–$20,000
estimated installed price
Cooling
22.5 kW
1.5 stars
Heating
23.3 kW
1 stars
Indoor noise
–
dB(A) sound power
Running cost
$2,473
a year, average zone, at 33c/kWh
Short answer
The Temperzone 22.5 kW ducted system (ISD 251LYX / OSA 251RLTFH) is a 22.5 kW reverse cycle ducted rated 1.5 stars for cooling and 1 stars for heating in the average climate zone. Installed, expect $12,000 to $20,000; the label's figures put running costs near $2,473 a year in an average-zone home.
Prices are estimates, not quotes (how we estimate them). Rebate rules checked September 2026.
Compare 3 quotes for my houseFull specifications
- Brand
- Temperzone
- Model numbers
- ISD 251LYX / OSA 251RLTFH
- Type
- Ducted, reverse cycle (heats and cools)
- Cooling capacity
- 22.5 kW
- Cooling power input
- 7.07 kW
- Heating capacity
- 23.3 kW
- Heating power input
- 6.7 kW
- Heating output at 2°C outside
- 20.5 kW
- Annual efficiency, cooling (AEER)
- 3.15
- Annual efficiency, heating (ACOP)
- 3.44
- Indoor sound power
- –
- Outdoor sound power
- –
- Refrigerant
- R32
- Power supply
- Three-phase
- Demand response capable
- No
- Country of manufacture
- Australia, New Zealand
- Energy Rating registration
- AAC8608
- Registration valid until
- 2030-02-24
Star ratings and running cost by climate
The Zoned Energy Rating Label rates each unit for three climates. Annual energy is the label's estimate for typical use in that zone; the cost applies 33c/kWh, around the 2026–27 default electricity offer. Use the running cost calculator for your own hours and tariff.
| Climate zone | Cooling stars | Heating stars | Energy a year | Cost a year |
|---|---|---|---|---|
| HotBrisbane, Darwin | 1.5 stars | 1 stars | 9,897 kWh 9179 cooling, 718 heating | $3,266 |
| AverageSydney, Adelaide, Perth | 1.5 stars | 1 stars | 7,493 kWh 3112 cooling, 4381 heating | $2,473 |
| ColdCanberra, Hobart, Melbourne | 1 stars | 1 stars | 13,011 kWh 2069 cooling, 10942 heating | $4,294 |
How it compares with other 18 kW and up units
- Cooling stars (average zone): 1.5 against a median of 1.5 across 80 18 kW and up ducted units, better than 0% of them.
- Estimated installed price for this size: $12,000 to $20,000. Brand and install difficulty move it within that band.
See the quietest and most efficient rankings.
Alternatives at 18 kW and up from other brands
ActronAir Advance 19 kW ducted system
CRV19BT / EVV19BS
2.5 stars cooling · – dB(A)
ActronAir 19 kW ducted system
CRV210T / EVV210S
2.5 stars cooling · – dB(A)
ActronAir Aires 19.8 kW ducted system
CRS20AT / EVA20AS
2.5 stars cooling · – dB(A)
ActronAir 21.5 kW ducted system
CRV240T / EVV240S
2.5 stars cooling · – dB(A)
ActronAir Advance 22 kW ducted system
CRV22BT / EVV22BS
2.5 stars cooling · – dB(A)
ActronAir Aires 22.6 kW ducted system
CRS23AT / EVA23AS
2.5 stars cooling · – dB(A)
FAQ
Temperzone ISD 251LYX / OSA 251RLTFH: common questions
How much does the Temperzone 22.5 kW ducted system cost installed?
Typically $12,000 to $20,000 supplied and installed in 2026 for a standard job at this size. Longer pipe runs, a new circuit, a second storey or removing an old unit add to it. Get up to three local quotes for your actual install.
How much does the Temperzone 22.5 kW ducted system cost to run?
Using the energy label's annual figures at 33c/kWh: about $3,266 a year in a hot zone, $2,473 in an average zone and $4,294 in a cold zone. The label assumes typical use; yours will differ with hours, set temperature and insulation.
Where is the Temperzone ISD 251LYX / OSA 251RLTFH made?
The Energy Rating register lists the country of manufacture as Australia, New Zealand.
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