Heat Pump vs Ducted Air Conditioning - What Suits a Tasmanian Home

A straightforward comparison for Hobart homeowners weighing up a new heating and cooling system, from installation to running costs in a Tasmanian climate. It's a decision most people only make once every decade or two, and quotes for the two systems can look wildly different on paper, so it pays to understand what's actually behind the numbers before committing either way.

Key takeaways

• Both systems use the same technology. A "heat pump" and a reverse-cycle ducted system work the same way, the difference is scale, heating one or two rooms versus the whole house.
• Hobart's climate favours efficient heating over aggressive cooling. Winter performance matters more here than summer cooling capacity.
• Older Hobart homes often suit split systems better. Weatherboard cottages and homes without existing ceiling ductwork face real access constraints for a full ducted retrofit.
• Running costs come down to zoning. Heating only the rooms you use tends to cost less than conditioning a whole house through ducting.
• Get the switchboard checked first. Adding a heating and cooling system to an older board is a common oversight that causes problems down the track.

Winter in Hobart tends to make the heating question urgent all at once, usually on the first properly cold night of the year. Whether you're in a weatherboard cottage in Glenorchy, a newer build in Kingston, or a character home in Sandy Bay, the choice between a heat pump and a ducted system shapes both comfort and running costs for years to come.

Both fall under the same broad technology, so the real decision is about scale, zoning and what your home can physically accommodate.

This post covers how the two compare, what Tasmania's conditions mean for the choice, and the questions worth asking before committing either way. If you'd rather talk it through than read it through, a chat with a licensed Hobart electrician who's actually been up in a few hundred local roof cavities tends to cut the decision down fast.

For the full range of work we handle, our services page is a good starting point.

How heat pumps and ducted systems actually differ

A heat pump, in the way most Hobart homeowners use the term, usually means a single split or a multi-head split covering two or three rooms, part of our heat pump installation and maintenance work. Each indoor unit heats or cools the room it's connected to, running off a shared or dedicated outdoor compressor.

A ducted system uses the same reverse-cycle principle underneath, but pushes conditioned air through ceiling ductwork to vents throughout the house, controlled from one or more zone panels.

The difference is distribution, not the underlying technology, ducted aims to condition the whole home evenly, while splits let you heat just the rooms in use.

That distinction matters more than people expect when comparing quotes. A single split for a living room is a very different project to whole-house ducting, and working out which category you actually need saves a lot of back and forth later.

"A lot of people ask for a ducted quote when what they perhaps need is heating in the two rooms they live in most. Once we walk through which rooms get used daily, a lot of Hobart homes end up better served by a couple of well-placed splits than one big ducted system," says Josh, owner of Rock Electrical.

What Hobart's climate means for the decision

Tasmania's conditions push this decision in a specific direction. Heating and cooling make up around half of the average Tasmanian household's energy use, per the state government's ReCFIT energy efficiency guidance, a far larger share than warmer states where summer cooling dominates.

A few local factors are worth weighing up first.

Winter performance matters more than cooling capacity.

Hobart's cold, damp winters mean the system works hard for months, while summer is mild enough that cooling is often a nice-to-have.

Older housing stock changes what's practical.

Homes in areas like New Town and Glenorchy often predate ducted systems, and retrofitting ductwork into a shallow ceiling cavity turns a simple job into a much bigger one.

Damp conditions affect outdoor unit placement.

Coastal and low-lying properties on the eastern shore need units sited and drained properly to avoid corrosion.

Exposed, elevated sites see harsher conditions.

Steeper blocks cop more wind and temperature swings, worth factoring into sizing and placement.

Zoning suits how Tasmanians live in winter.

Households often heat living areas hard in the evening and let bedrooms run cooler, favouring a system that zones easily.

Efficiency and running costs to weigh up

Reverse-cycle systems, split or ducted, are genuinely efficient against old-style electric heaters. Per the Australian Government's energy.gov.au heating and cooling guidance, reverse-cycle air conditioning can be 300 to 600 percent efficient, turning one unit of electricity into three to six times as much heating or cooling.

That holds up in the cold too, since air at zero degrees still carries roughly 90 percent of the usable energy that air at 40 degrees does, which is why a heat pump keeps working through a genuine Hobart winter.

The two systems differ in how that efficiency plays out across a house. Ducted conditions every zoned area whenever it runs, so it typically uses more energy per hour than a single split heating one room, which usually means lower running costs for households mostly using two or three rooms.

Upfront cost follows the same pattern in reverse. A single split is cheapest to install, a multi-head sits in the middle, and a full ducted system is the largest investment because of the ductwork, dampers and control panel involved.

Installation considerations for older Hobart homes

Much of the decision-making happens before any equipment goes in, particularly in older housing stock where the building sets the constraints. Getting this right early avoids a job blowing out partway through.

• Ceiling cavity access is the first thing to check. Weatherboard cottages and older brick homes in suburbs like Sandy Bay sometimes have very shallow roof spaces, which limits or rules out ducting.
• Switchboard capacity needs assessing first. Homes built before the 1980s weren't designed for a heat pump alongside solar and an EV charger, and undersized boards are a common mid-job discovery. Our switchboard upgrade page covers what that involves.
• Outdoor unit placement affects compliance and noise. Council setback rules apply in most Hobart municipalities, and a poorly placed unit can end up too close to a neighbour's window.
• Heritage overlays can restrict visible ducting. Character homes with heritage protection sometimes need discreet vent placement rather than obvious rooftop penetrations.
• Existing wiring may need attention regardless of system. Older circuits weren't sized for a modern reverse-cycle load, worth checking alongside the main job.

"Half the calls we get about heat pumps aren't really about the heat pump, they're about the switchboard behind it. If the board's from the eighties and already carrying solar and an EV charger, a new heating circuit is often the thing that tips it over and forces an upgrade," says Josh.

Heat pump vs ducted at a glance

The table below sets out how the two options generally compare for a typical Hobart home. Treat it as a starting point, the right answer always comes down to the specific property and how the household uses the space.

Neither column is the "correct" one across the board.

A young family filling every bedroom every night has a different case for ducted heating than a couple mostly living in an open-plan area who let the rest of the house run cooler.

Choosing what actually suits your household

Working through this starts with an honest look at how the home gets used, not just how many rooms it has. A four-bedroom house where two bedrooms sit empty through winter doesn't necessarily need whole-home ducted heating, no matter how the floor plan looks on paper.

Cost and timing matter too. A staged approach, starting with a heat pump in the main living area and adding heads over time, suits plenty of households better than committing to a full ducted system in one go.

It's also worth weighing up other electrical work planned down the track. If solar is on the horizon, running an efficient reverse-cycle system during daylight hours makes good use of self-generated power, worth discussing heating and solar system installation together rather than separately.

"The best system on paper isn't always the best system for that particular house. I'd rather talk someone out of an oversized ducted system and into two good splits than sell them something that doesn't actually suit how they live," says Josh.

What Hobart homeowners want to know

Can a heat pump actually keep a Hobart home warm through a proper winter?
‍Yes, reverse-cycle heat pumps stay efficient even in the cold, since outside air still carries most of its usable energy right down to zero degrees. This matters because it's the most common hesitation we hear, based on outdated assumptions about older units.

Is ducted heating worth it if I only use one or two rooms?
‍Usually not, since ducted conditions every zoned area whenever it runs, which costs more for households spending most of winter in a couple of rooms. A multi-head split targeting just those rooms is often the more practical, cheaper option to run.

Can I add a heat pump without major renovation work?
‍In most cases yes, a split or multi-head system can usually go in with minimal disruption, while a full ducted retrofit depends heavily on ceiling cavity access. This is why an on-site assessment matters more than a quote based on a floor plan alone.

Is a ducted system more likely to need repairs than a split system heat pump?
‍Generally yes, since a ducted system has more components, such as dampers, zone motors and longer duct runs, that can develop faults compared with a single indoor unit. This is worth weighing against the upfront cost difference, since fewer components in a split system usually means fewer things that can go wrong down the track.

Does the choice affect a home's resale value?
‍A well-maintained system of either type is generally seen as a plus by buyers, though ducted is sometimes viewed as a more complete, whole-house solution. That said, an efficient, well-placed split system in good condition is unlikely to count against a sale.

Get advice suited to your home

There's no single right answer between a heat pump and a ducted system, only the answer that fits how your household actually lives and what your home can accommodate. That's easier to work out on-site than over the phone, since ceiling cavity depth, switchboard capacity and which rooms genuinely need heating all shape the recommendation.

If you're weighing this up for a home anywhere across Hobart and southern Tasmania, our team can talk you through what's realistic for your property before you commit to either option. Get in touch and we'll book a time to have a look.