Air conditioning
in Murwillumbah
A 30 square metre living room in Murwillumbah needs about 3.91kW, against 4.97kW for the same room in Broken Hill, because Murwillumbah peaks at 33.8°C where Broken Hill hits 40.1°C. Installed prices here run $1,400–$3,600 for splits.
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Why Murwillumbah is different
Sizing advice written for "Tweed Heads" is written for an average that barely exists. Murwillumbah accumulates 118.5 cooling degree days a year and clears 35°C about 5.2 days. Broken Hill, elsewhere in NSW, accumulates 366.2 and clears 35°C about 47.6 days — roughly a 3 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 Murwillumbah
| Room | Approx size | Cooling needed | Unit to look for |
|---|---|---|---|
| Bedroom | 12m² | 1.56kW | 2kW |
| Large bedroom or study | 18m² | 2.34kW | 2.5kW |
| Small living area | 25m² | 3.26kW | 3.5kW |
| Living room | 30m² | 3.91kW | 4.2kW |
| Open-plan living and dining | 45m² | 5.86kW | 6kW |
| Large open plan | 60m² | 7.82kW | 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
Murwillumbah sits in the Essential Energy network area, where a residential flat rate currently runs about 31.82c per kilowatt hour (ENGIE NSW ENGIE Standing elec). On that rate, a typical 3.5kW split system used normally costs roughly $79 a year in cooling, against about $249 for the identical unit in Broken Hill.
That figure comes from the energy rating scheme's own registered consumption figures, measured across three Australian reference climates and fitted to Murwillumbah's 118.5 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 28.03c against 24.96c 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 Murwillumbah
Humidity, not just heat
Murwillumbah runs a January afternoon dew point around 20.2°C, which means the machine spends much of its work removing moisture rather than dropping temperature. A slightly larger unit run gently dehumidifies far better than a small one at full tilt, and comfort here depends on that more than on the thermostat reading.
Ducted is genuinely viable here
88.2% of Murwillumbah 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.
Established housing, check the switchboard
Murwillumbah has a median age of 47 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.
Installed prices
| System | Installed price | Suits |
|---|---|---|
| Small split (2.5kW) | $1,400–$2,250 | Bedrooms and studies |
| Large split (5-7kW) | $2,350–$3,600 | Living areas |
| Ducted, whole home | $9,900–$15,800 | Houses with roof access |
Tweed Heads pricing. See the full Tweed Heads cost guide for a breakdown by job, the New South Wales rebate guide for discounts that come off these figures, or installers who service Murwillumbah when you want these numbers quoted on your actual job.
About Murwillumbah
Around 7,641 people live in Murwillumbah (estimated for 2025), across roughly 7,250 occupied dwellings. The housing mix is 7.1% apartments, 88.2% separate houses and 3.3% 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 Murwillumbah'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 MURWILLUMBAH (BRAY PARK) (058158). Nearest qualifying station (still reporting, 53.9 yr of record, 98% complete). MURWILLUMBAH (BRAY PARK) (058158) is 2.1 km away, 18.5 km from the open coast against the suburb's 16.9 km, at 8 m against the suburb's 11 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.