Air conditioning
in Cherrybrook
A 30 square metre living room in Cherrybrook needs about 4.21kW, against 3.15kW for the same room in Kiama, because Cherrybrook peaks at 35.6°C where Kiama hits 29.3°C. Installed prices here run $1,350–$3,500 for splits.
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Why Cherrybrook is different
Sizing advice written for "Sydney" is written for an average that barely exists. Cherrybrook accumulates 91.4 cooling degree days a year and clears 35°C about 12.6 days. Kiama, across Sydney, accumulates 21.5 and clears 35°C about 1.8 days — roughly 4 times the cooling demand. 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 Cherrybrook
| Room | Approx size | Cooling needed | Unit to look for |
|---|---|---|---|
| Bedroom | 12m² | 1.68kW | 2kW |
| Large bedroom or study | 18m² | 2.53kW | 2.5kW |
| Small living area | 25m² | 3.51kW | 3.5kW |
| Living room | 30m² | 4.21kW | 4.2kW |
| Open-plan living and dining | 45m² | 6.32kW | 6kW |
| Large open plan | 60m² | 8.42kW | 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
Cherrybrook sits in the Ausgrid network area, where a residential flat rate currently runs about 30.12c per kilowatt hour (ENGIE NSW ENGIE Standing elec). On that rate, a typical 3.5kW split system used normally costs roughly $59 a year in cooling, against about $14 for the identical unit in Kiama.
That figure starts from the appliance's registered energy rating data, then scales it by Cherrybrook's own cooling degree days against the reference site the rating uses (Richmond RAAF (067105), 113 degree days). Without that adjustment every suburb in the zone would show an identical number, which would tell you nothing.
On a time-of-use plan in this network, electricity between 15:00 to 20:59 costs about 54.72c against 21.85c 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 Cherrybrook
You probably need less than you think
Cherrybrook accumulates only 91.4 cooling degree days a year and clears 35°C about 12.6 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.
Ducted is genuinely viable here
81.5% of Cherrybrook dwellings are separate houses, most with accessible roof space, which makes ducted a real option rather than a stretch. The check that matters is roof cavity height and insulation condition, and any installer can confirm both in a five-minute inspection before quoting.
Family-sized homes, zoned systems
Average household size in Cherrybrook 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.
Established housing, check the switchboard
Cherrybrook has a median age of 43 and correspondingly older housing stock. The thing that catches people out is electrical: an older switchboard may not have a spare circuit for a large system, and that upgrade is legitimate money rather than an upsell. Ask for it to be itemised separately in the quote so you can compare like with like.
The peak window costs real money here
On a Ausgrid time-of-use plan, electricity runs about 54.72 cents during the peak window (15:00 to 20:59) against 21.85 cents off-peak, close to double. Cooling the house hard through that window is where summer bills get away from people in Cherrybrook. Pre-cooling before it starts costs noticeably less for the same comfort.
Installed prices
| System | Installed price | Suits |
|---|---|---|
| Small split (2.5kW) | $1,350–$2,000 | Bedrooms and studies |
| Large split (5-7kW) | $2,100–$3,500 | Living areas |
| Ducted, whole home | $6,500–$12,000 | Houses with roof access |
Sydney pricing. See the full Sydney cost guide for a breakdown by job, or the New South Wales rebate guide for discounts that come off these figures.
About Cherrybrook
Around 19,009 people live in Cherrybrook (estimated for 2025), across roughly 5,942 occupied dwellings. The housing mix is 1.2% apartments, 81.5% separate houses and 17.2% 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 Cherrybrook'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 PARRAMATTA NORTH (MASONS DRIVE) (066124). Nearest qualifying station (still reporting, 59.0 yr of record, 98% complete). PARRAMATTA NORTH (MASONS DRIVE) (066124) is 8.1 km away, 25.2 km from the open coast against the suburb's 23.4 km, at 55 m against the suburb's 156 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.