Newnham 7248Climate zone 7 · TasNetworks

Air conditioning
in Newnham

A 30 square metre living room in Newnham needs about 3.06kW, against 3.37kW for the same room in Claremont, because Newnham peaks at 28.8°C where Claremont hits 30.6°C. Installed prices here run $1,550–$3,900 for splits.

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Why Newnham is different

Sizing advice written for "Hobart" is written for an average that barely exists. Newnham accumulates 1.7 cooling degree days a year and clears 35°C about 0.1 days. Claremont, across Hobart, accumulates 6.8 and clears 35°C about 2.2 days — roughly a 4 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 Newnham

Room	Approx size	Cooling needed	Unit to look for
Bedroom	12m²	1.22kW	2kW
Large bedroom or study	18m²	1.84kW	2kW
Small living area	25m²	2.55kW	2.5kW
Living room	30m²	3.06kW	3.5kW
Open-plan living and dining	45m²	4.59kW	4.2kW
Large open plan	60m²	6.12kW	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

Newnham 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 $29 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 Newnham's 1.7 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.

Watch the peak window.

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.

Local factors

What changes a quote in Newnham

You probably need less than you think

Newnham accumulates only 1.7 cooling degree days a year and clears 35°C about 0.1 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 1893 heating degree days and July mornings averaging 2.6°C, a reverse-cycle system in Newnham 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.

Newer housing, simpler installs

A median age of 33 alongside 79.6% 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 Newnham tend to cluster more tightly than in older areas.

The peak window costs real money here

On a TasNetworks time-of-use plan, electricity runs about 32.9 cents during the peak window (07:00 to 09:59) against 15.47 cents off-peak, close to double. Cooling the house hard through that window is where summer bills get away from people in Newnham. 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

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 Newnham

Around 7,153 people live in Newnham (estimated for 2025), across roughly 6,427 occupied dwellings. The housing mix is 3.2% apartments, 79.6% separate houses and 16.4% 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 Newnham's.

Sources and 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 LAUNCESTON (TI TREE BEND) (091237). Nearest qualifying station (still reporting, 46.3 yr of record, 99% complete). LAUNCESTON (TI TREE BEND) (091237) is 3.4 km away, 46.4 km from the open coast against the suburb's 43.0 km, at 5 m against the suburb's 58 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.

Air conditioning in Newnham: questions

What size air conditioner do I need in Newnham?

For a typical 30 square metre living room in Newnham, about 3.06kW, which in practice means a 3.5kW unit. Bedrooms usually land around 2kW. That comes from Newnham's design temperature of 28.8°C, against 30.6°C in Claremont, which is why the same room needs a different size in each. Any installer should still measure the room, since orientation, glazing and insulation move the answer.

What does it cost to run air conditioning in Newnham?

Roughly $2 a year in cooling for a typical 3.5kW split used normally, on TasNetworks network rates of about 25.41 cents a kilowatt hour. That figure starts from the appliance's registered energy rating and is then scaled by Newnham's own cooling degree days against the reference site the rating uses, because without that adjustment every suburb in the zone would show an identical number. If you are on a time-of-use plan, the peak window is where summer bills actually get away from people.

Can I get ducted air conditioning in Newnham?

Usually yes. 79.6% of Newnham dwellings are separate houses, and most have the roof access ducted needs. The practical checks are cavity height, insulation condition and whether your switchboard can carry the load, all of which an installer confirms on a short site visit before quoting.

When is the cheapest time to install in Newnham?

The shoulder seasons, and in Newnham that means autumn or early spring. Demand here peaks twice, for cooling in summer and heating in winter, so the quiet windows sit between them. Quoting in a quiet window gets sharper prices and avoids the queue that forms after the first extreme day of either season.

Air conditioning in Newnham