Air conditioning
in Blackmans Bay
A 30 square metre living room in Blackmans Bay needs about 3.1kW, against 3.37kW for the same room in Claremont, because Blackmans Bay peaks at 29°C where Claremont hits 30.6°C. Installed prices here run $1,550–$3,900 for splits.
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Why Blackmans Bay is different
Sizing advice written for "Hobart" is written for an average that barely exists. Blackmans Bay accumulates 7.2 cooling degree days a year and clears 35°C about 1.5 days. Claremont, across Hobart, accumulates 6.8 and clears 35°C about 2.2 days — a comparable 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 Blackmans Bay
| Room | Approx size | Cooling needed | Unit to look for |
|---|---|---|---|
| Bedroom | 12m² | 1.24kW | 2kW |
| Large bedroom or study | 18m² | 1.86kW | 2kW |
| Small living area | 25m² | 2.58kW | 2.5kW |
| Living room | 30m² | 3.1kW | 3.5kW |
| Open-plan living and dining | 45m² | 4.64kW | 5kW |
| Large open plan | 60m² | 6.19kW | 6kW |
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
Blackmans Bay sits in the TasNetworks network area, where a residential flat rate currently runs about 25.41c per kilowatt hour (Aurora Energy Residential Flat rate with Off-Peak option). On that rate, a typical 3.5kW split system used normally costs roughly $30 a year in cooling, against about $8 for the identical unit in Claremont.
That figure comes from the energy rating scheme's own registered consumption figures, measured across three Australian reference climates and fitted to Blackmans Bay's 7.2 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 09:59 costs about 32.9c against 15.47c 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 Blackmans Bay
Salt air shortens outdoor unit life here
Blackmans Bay sits about 0.8km from the coast, and salt-laden air attacks aluminium fins and steel casings far faster than it does inland. Ask what corrosion protection the outdoor unit carries and read the coastal terms in the manufacturer warranty, because several brands reduce or exclude cover within a set distance of surf. That clause is worth checking before you choose the unit rather than after.
You probably need less than you think
Blackmans Bay accumulates only 7.2 cooling degree days a year and clears 35°C about 1.5 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 1801 heating degree days and July mornings averaging 5.2°C, a reverse-cycle system in Blackmans Bay 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.
Ducted is genuinely viable here
92.6% of Blackmans Bay 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
Blackmans Bay has a median age of 42 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) | $1,550–$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 |
Hobart pricing. See the full Hobart cost guide for a breakdown by job, or the Tasmania rebate guide for discounts that come off these figures.
About Blackmans Bay
Around 7,767 people live in Blackmans Bay (estimated for 2025), across roughly 2,917 occupied dwellings. The housing mix is 2.9% apartments, 92.6% separate houses and 4.1% 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 Blackmans Bay's.
- Air conditioning in Kingston 3.6km
- Air conditioning in Sandy Bay 12km
- Air conditioning in Howrah 15.7km
- Air conditioning in Glenorchy 19.3km
- Air conditioning in Claremont 24.5km
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 HOBART (ELLERSLIE ROAD) (094029). The nearest qualifying station is DENNES POINT (094255) at 7.3 km, but it is a sand-spit/island site (only 29% land within 5 km) and is marine-moderated; its record is shorter or less complete (14.0 yr, 99%). HOBART (ELLERSLIE ROAD) (094029) is 12.8 km away, 2.2 km from the open coast against the suburb's 0.8 km, at 50 m against the suburb's 42 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.