Air conditioning
in Gungahlin
A 30 square metre living room in Gungahlin needs about 4.09kW, against 5.38kW for the same room in South Hedland, because Gungahlin 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 Gungahlin is different
Sizing advice written for "Canberra" is written for an average that barely exists. Gungahlin 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 Gungahlin
| 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
Gungahlin 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 Gungahlin'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 Gungahlin
46.4% of Gungahlin homes are apartments
That changes the job more than the climate does. Most of that is three storeys or higher, so the owners corporation almost certainly has rules about condenser placement and noise. Expect to need owners corporation approval before anything is mounted on a common wall, and allow two to six weeks for it on top of the install lead time. Start the paperwork before you book the installer, because approval is the single most common cause of a delayed job in apartment suburbs.
You probably need less than you think
Gungahlin 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 Gungahlin 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.
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 Gungahlin. 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 Gungahlin
Around 9,532 people live in Gungahlin (estimated for 2025), across roughly 3,225 occupied dwellings. The housing mix is 46.4% apartments, 35.4% separate houses and 17.3% 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 Gungahlin's.
- Air conditioning in Franklin 1.6km
- Air conditioning in Harrison 2.3km
- Air conditioning in Ngunnawal 2.7km
- Air conditioning in Bonner 3.5km
- Air conditioning in Kaleen 5.2km
- Air conditioning in Bruce 7.7km
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 14.8 km away, 102.1 km from the open coast against the suburb's 113.6 km, at 577 m against the suburb's 627 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.