Air conditioning
in Bonner
A 30 square metre living room in Bonner needs about 4.09kW, against 5.38kW for the same room in South Hedland, because Bonner peaks at 34.9°C where South Hedland hits 42.5°C. Installed prices here run $1,550–$3,900 for splits.
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Why Bonner is different
Sizing advice written for "Canberra" is written for an average that barely exists. Bonner accumulates 33.1 cooling degree days a year and clears 35°C about 9.9 days. South Hedland, interstate, accumulates 1395.7 and clears 35°C about 153 days — roughly a 42 times lighter cooling load. That is why the same room needs a different size unit depending which suburb it sits in, and why a number quoted for the metro average will be wrong for most addresses in it.
What size you need in Bonner
| Room | Approx size | Cooling needed | Unit to look for |
|---|---|---|---|
| Bedroom | 12m² | 1.64kW | 2kW |
| Large bedroom or study | 18m² | 2.46kW | 2.5kW |
| Small living area | 25m² | 3.41kW | 3.5kW |
| Living room | 30m² | 4.09kW | 4.2kW |
| Open-plan living and dining | 45m² | 6.14kW | 6kW |
| Large open plan | 60m² | 8.19kW | 8kW |
Sizing follows the design criterion AIRAH uses in its FairAir calculator: the 3pm outdoor temperature exceeded on no more than 10 days a year. We compute that figure for each suburb from Bureau of Meteorology daily records, then split the cooling load into a component that scales with how far the design temperature sits above 24C and a component from sun and internal heat that barely varies by location. That 50/50 split is our assumption, not AIRAH's. Treat the result as a starting point for a quote, not a substitute for an installer measuring your rooms.
What it costs to run here
Bonner sits in the Evoenergy network area, where a residential flat rate currently runs about 33.47c per kilowatt hour (EnergyAustralia Standing Offer (Home)). On that rate, a typical 3.5kW split system used normally costs roughly $50 a year in cooling, against about $641 for the identical unit in South Hedland.
That figure comes from the energy rating scheme's own registered consumption figures, measured across three Australian reference climates and fitted to Bonner's 33.1 cooling degree days: about 111.4 kilowatt hours a year regardless of climate, plus 1.16 per degree day, then charged at the local tariff. The fixed part matters, because a running air conditioner draws power for standby and part-load cycling even where there is barely any cooling to do — which is why the mildest suburbs still cost something rather than nothing.
On a time-of-use plan in this network, electricity between 07:00 to 08:59 costs about 43.34c against 24.65c off-peak. Cooling the house hard through that window is where summer bills actually get away from people. Pre-cooling before it starts costs noticeably less.
What changes a quote in Bonner
You probably need less than you think
Bonner accumulates only 33.1 cooling degree days a year and clears 35°C about 9.9 days. Oversizing is the common and expensive mistake here: too much capacity short-cycles, dehumidifies poorly and costs more upfront and to run. If an installer quotes a size up without measuring the room, ask them to justify it.
Winter matters as much as summer
With 1868 heating degree days and July mornings averaging 0.1°C, a reverse-cycle system in Bonner earns its keep for heating at least as much as cooling. Ask for the heating output at low ambient temperature rather than the nominal kW, because that figure is what determines whether it copes on the coldest mornings.
Family-sized homes, zoned systems
Average household size in Bonner is 3.1 people, and with mostly detached housing that usually means bedrooms in use at different times to living areas. Zoning a ducted system, or splitting across multiple heads, tends to beat one large unit on running cost even where the upfront number is similar.
Newer housing, simpler installs
A median age of 31 alongside 71.5% detached housing points to a suburb built relatively recently. That usually means modern switchboards with capacity to spare, accessible roof cavities and straightforward pipe routes, all of which keep labour down. It is one reason quotes in Bonner tend to cluster more tightly than in older areas.
The peak window costs real money here
On a Evoenergy time-of-use plan, electricity runs about 43.34 cents during the peak window (07:00 to 08:59) against 24.65 cents off-peak, close to double. Cooling the house hard through that window is where summer bills get away from people in Bonner. Pre-cooling before it starts costs noticeably less for the same comfort.
Installed prices
| System | Installed price | Suits |
|---|---|---|
| Small split (2.5kW) | $1,550–$2,450 | Bedrooms and studies |
| Large split (5-7kW) | $2,600–$3,900 | Living areas |
| Ducted, whole home | $11,000–$17,000 | Houses with roof access |
Canberra pricing. See the full Canberra cost guide for a breakdown by job, or the the ACT rebate guide for discounts that come off these figures.
About Bonner
Around 7,436 people live in Bonner (estimated for 2025), across roughly 10,857 occupied dwellings. The housing mix is 10.3% apartments, 71.5% separate houses and 18% semi-detached or townhouses, which is what drives most of the practical differences in getting a system installed here.
Nearby suburbs
Climate, network tariffs and housing stock shift across a metro, so the sizing and running costs on these pages differ from Bonner's.
Sources and data
- ABS Census 2021, dwelling structure and medians by postcode
- ABS Regional population 2024-25 (population estimate basis)
- Bureau of Meteorology, Climate Data Online
- Australian Building Codes Board climate zone map
- AIRAH FairAir cooling calculator (design condition methodology)
- Consumer Data Right energy plan data (network and tariffs)
- energyrating.gov.au product database (zoned energy rating data)
Based on Australian Bureau of Statistics data. Source: ABS, Census of Population and Housing 2021 and Regional population 2024-25, licensed under CC BY 4.0. Climate data: Bureau of Meteorology, licensed under CC BY 4.0. Climate zones: Australian Building Codes Board. Tariffs: Consumer Data Right energy plan data. Appliance energy data: energyrating.gov.au (E3 Program).
Population is an estimate derived from the 2021 Census count scaled by regional growth to 2025, not an official count. Climate figures come from CANBERRA AIRPORT (070351). Nearest qualifying station (still reporting, 18.0 yr of record, 99% complete). CANBERRA AIRPORT (070351) is 17.9 km away, 102.1 km from the open coast against the suburb's 114.9 km, at 577 m against the suburb's 652 m. Stations are ranked on distance plus penalties for differing coastal exposure, elevation, NCC climate zone, record length and marine (sand-spit or island) siting.