Bonaire 3.5 kW split system
$1,700–$2,700
estimated installed price
Cooling
3.5 kW
4 stars
Heating
3.6 kW
3 stars
Indoor noise
53.9
dB(A) sound power, quieter than 78% of its size
Running cost
$229
a year, average zone, at 33c/kWh
Short answer
The Bonaire 3.5 kW split system (STH035S1AE/STH035S1AI) is a 3.5 kW reverse cycle wall split rated 4 stars for cooling and 3 stars for heating in the average climate zone. Installed, expect $1,700 to $2,700; the label's figures put running costs near $229 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
- Bonaire
- Model numbers
- STH035S1AE/STH035S1AI
- Type
- Wall split, reverse cycle (heats and cools)
- Cooling capacity
- 3.5 kW
- Cooling power input
- 0.87 kW
- Heating capacity
- 3.6 kW
- Heating power input
- 0.85 kW
- Annual efficiency, cooling (AEER)
- 4
- Annual efficiency, heating (ACOP)
- 4.24
- Indoor sound power
- 53.9 dB(A)
- Outdoor sound power
- 63.8 dB(A)
- Refrigerant
- R32
- Power supply
- Single-phase
- Demand response capable
- Yes
- Country of manufacture
- China
- Energy Rating registration
- AAC9487
- Registration valid until
- 2030-10-14
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 | 4.5 stars | 3.5 stars | 801 kWh 733 cooling, 68 heating | $264 |
| AverageSydney, Adelaide, Perth | 4 stars | 3 stars | 693 kWh 258 cooling, 435 heating | $229 |
| ColdCanberra, Hobart, Melbourne | 4 stars | 2.5 stars | 1,296 kWh 163 cooling, 1133 heating | $428 |
How it compares with other 3.5 kW units
- Cooling stars (average zone): 4 against a median of 4.5 across 242 3.5 kW wall split units, better than 24% of them.
- Indoor sound power: 53.9 dB(A) against a median of 57 dB(A), quieter than 78%.
- Estimated installed price for this size: $1,700 to $2,700. Brand and install difficulty move it within that band.
See the quietest and most efficient rankings.
Alternatives at 3.5 kW from other brands
ActronAir Serene 3.5 kW split system
WRC-035DS / WRE-035DS
6 stars cooling · 58.8 dB(A)
Midea EOS 3.5 kW split system
MFEP35VB-W/MFEP35VB-N
6 stars cooling · 58.8 dB(A)
Haier 600 Series Q 3.5 kW split system
1U35MAEFRA / AS35QCEHRA
6 stars cooling · 62.8 dB(A)
Westinghouse 3.6 kW split system
WSD36HWB-I/WSD36HWA-E
5.5 stars cooling · 51.3 dB(A)
Midea EOS 3.5 kW split system
MFEP35VA-W/MFEP35VA-N
5.5 stars cooling · 55.8 dB(A)
Midea GAIA 3.5 kW split system
MFCA35VA-W/MFCA35VA-N
5.5 stars cooling · 56.1 dB(A)
FAQ
Bonaire STH035S1AE/STH035S1AI: common questions
How much does the Bonaire 3.5 kW split system cost installed?
Typically $1,700 to $2,700 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 Bonaire 3.5 kW split system cost to run?
Using the energy label's annual figures at 33c/kWh: about $264 a year in a hot zone, $229 in an average zone and $428 in a cold zone. The label assumes typical use; yours will differ with hours, set temperature and insulation.
Where is the Bonaire STH035S1AE/STH035S1AI made?
The Energy Rating register lists the country of manufacture as China.
Is the Bonaire 3.5 kW split system quiet?
Its registered indoor sound power is 53.9 dB(A), against a median of 57 dB(A) for 3.5 kW wall split units, so it's quieter than about 78% of them. Brochures quote a lower sound pressure figure on the lowest fan speed; the register measures every model the same way.
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