Ducted Heating vs Underfloor Heating: The 2026 Australian Guide

Air Quality and Health

The air quality difference between these two systems is significant and often underestimated by homeowners at the specification stage.

Ducted air conditioning moves air continuously. Every heating or cooling cycle draws air through a return grille, passes it through the air handling unit, and pushes it back through the duct network and vents. Any dust, pollen, mould spores, or pet dander in the system travels with it. Filters catch some of this material, but filters require regular cleaning and replacement to remain effective. A poorly maintained ducted system actively distributes allergens through every room it serves, every time it runs.

Ducted systems also introduce a humidity management challenge. When heating, they dry the air. When cooling, they dehumidify. Constant cycling between these states affects respiratory comfort, skin hydration, and the health of timber floors and furniture throughout the home.

Underfloor heating produces none of these issues. There is no air movement, no duct network, and no filter to maintain. The air in the room stays still, retains its natural humidity, and remains free of circulated allergens. This makes underfloor heating the healthiest heating choice for households with allergy sufferers, asthma patients, or young children. Read the full evidence in our guide to whether underfloor heating is good for your health.

Comfort Heat tip: If anyone in your household suffers from asthma, allergies, or dust sensitivity, underfloor heating eliminates all heating-related allergen triggers. No ducts means no dust circulation, no filter maintenance, and no compromised air quality.

Running Costs: Ducted Heating vs Underfloor Heating

Running costs depend on system size, home insulation, climate zone, usage habits, and electricity tariff. Here is an honest breakdown for a typical Australian home.

Ducted Reverse-Cycle Air Conditioning Running Costs

A ducted reverse-cycle system in a medium-sized Australian home (around 160 square metres) costs roughly $1,400 to $1,600 per year to run for heating across a typical winter, based on estimates from Sustainability Victoria and CHOICE's 2025 home heating analysis. These figures assume a well-programmed thermostat, a modern inverter-driven system, and standard insulation. Older or less efficient systems cost significantly more to run.

Electric Underfloor Heating Running Costs

Electric underfloor heating costs around 2 to 5 cents per square metre per hour to run. For individual rooms — bathrooms, kitchens, bedrooms — electric systems are extremely affordable to operate. A typical 5 square metre bathroom heated for 4 hours a day costs less than $65 for an entire Australian winter. For whole-home electric coverage, running costs are higher, which is why Comfort Heat recommends electric systems for targeted room heating and hydronic for whole-home applications. Full cost details are available in our underfloor heating cost guide.

Hydronic Underfloor Heating Running Costs

Hydronic underfloor heating paired with the Intaflo Series 3 heat pump is the most cost-effective whole-home heating option for larger Australian homes. The Intaflo achieves a COP (coefficient of performance) of around 3.45, meaning it delivers 3.45 units of heat for every 1 unit of electricity consumed. Annual running costs for a medium-sized home typically sit between $1,200 and $1,500 — comparable with or lower than ducted reverse-cycle — with a major long-term advantage: it is fully compatible with rooftop solar. Pre-heating the slab during peak solar generation hours (typically 10am to 3pm) means the floor holds warmth into the evening at minimal electricity cost.

Figures are approximate for a medium-sized Australian home of around 160 square metres. Actual costs vary with tariff, insulation, climate zone, and usage patterns.

Installation Costs & Requirements

Ducted Air Conditioning Installation

A ducted reverse-cycle system requires an outdoor compressor, an indoor air handling unit, a duct network throughout the ceiling or sub-floor cavity, and grilles in each room. In new builds this is built in from the start and costs between $8,000 and $16,000 depending on home size, number of zones, duct length, and brand. Retrofitting into an existing home is significantly more expensive and disruptive — ceiling cavities must be accessed, ducts run throughout the home, and significant construction work carried out. The system also requires ongoing refrigerant servicing and filter maintenance.

Electric Underfloor Heating Installation

Electric underfloor heating is the most straightforward system to install. Thin Heating Mats sit within the tile adhesive layer and add minimal floor height — ideal for bathrooms and kitchens. Screed Cable systems are embedded in a sand-and-cement screed and work under any floor covering. Both are best installed during a renovation when the floor is being opened up anyway. For confident owner-builders, DIY Electric Kits are available with a custom design layout and full technical support. Installation costs typically range from $100 to $200 per square metre, including thermostat and electrical connection.

Hydronic Underfloor Heating Installation

Hydronic installation involves laying pipe loops across the floor before the screed or slab is poured, connecting all loops to a central manifold, and connecting a heat source — the Intaflo Series 3 heat pump — to the circuit. Best specified at the design stage of a new build or major renovation. Hydronic is recommended for areas of 80 square metres and above, with a minimum of 40 square metres. DIY Hydronic Kits are available for licensed tradespeople and experienced owner-builders. Installation typically costs $150 to $300 per square metre, plus the heat source.

Not sure which system suits your project? Use the Comfort Heat Product Finder for a personalised recommendation in minutes.

Cooling: What Underfloor Heating Cannot Do (and What To Do About It)

This is the honest answer to the most common objection to underfloor heating: ducted reverse-cycle air conditioning provides both heating and cooling from a single system. Underfloor heating provides heating only.

In Australia's warmer states — Queensland, coastal New South Wales, Western Australia, the Northern Territory — cooling is as important as heating. A heating-only system requires a separate cooling solution, which means additional upfront cost.

However, the tradeoff is worth understanding clearly. A ducted reverse-cycle system that does everything moderately well costs $8,000 to $16,000 installed. A hydronic underfloor heating system paired with a high-efficiency multi-head split system or a separate small ducted system for cooling gives you a significantly better heating outcome and equally effective cooling — often at a comparable or lower total cost over 10 years when running cost savings are factored in.

For cooler-climate states — Victoria, Tasmania, the ACT, alpine regions of New South Wales — where heating is the dominant need for 6 or more months of the year, and where summers rarely exceed levels requiring aggressive air conditioning, underfloor heating as the primary system with a supplementary cooling solution is a well-established and cost-effective approach.

Comfort Heat's recommendation: in Victoria, Tasmania, and highland regions of New South Wales and the ACT, underfloor heating as primary heating paired with a split system for summer cooling is our most commonly specified whole-home solution for new builds. It delivers better heating comfort, lower running costs, and a healthier indoor environment than ducted reverse-cycle alone.

Maintenance Requirements

Electric underfloor heating has the lowest maintenance requirement of any heating system available in Australia. Once installed, it runs quietly under the floor for 25 to 35 years with nothing to clean, service, or replace. Hydronic systems require an annual heat pump service — similar to a ducted AC service — but the pipe circuit itself is sealed, uses no refrigerant, and requires no access to ceiling cavities or duct networks.

Long-Term Value and Resale Appeal

Both systems add value to an Australian home, but in different ways and to different buyer audiences.

Ducted reverse-cycle air conditioning is a known quantity. Most Australian buyers expect it in a new home and many see it as a baseline rather than a premium. Its value contribution is real but increasingly commoditised — particularly as the market matures and virtually every new build includes a ducted system.

Underfloor heating is still a differentiator. In the premium and upper-mid market, particularly for bathrooms, master bedrooms, and high-specification new builds, underfloor heating is increasingly expected by buyers and design professionals. Architects and interior designers specify it routinely for both aesthetic and performance reasons — no visible vents, no radiators, and no hardware interrupting the design of the space.

A well-designed underfloor heating system can be up to 40% more energy-efficient than ducted air systems, which is a compelling proposition for buyers evaluating long-term ownership costs. Read our guide to installing energy-efficient underfloor heating in a new home for how to specify this correctly from the design stage.

Decision Matrix: Ducted Heating vs Underfloor Heating Australia

Use this table to match the right system to your situation.

For more on zone control options for underfloor heating, read our guide to zone-controlled underfloor heating in Australia.

Which System Is Right for Your Australian Home? 

The right answer depends on your climate zone, project type, budget, and what matters most to you about your home environment.

Choose ducted reverse-cycle AC if:

• You are in a warm-climate state (Queensland, coastal NSW, WA, NT) where cooling is as important as heating
• You want a single system for both heating and cooling and do not want to manage separate solutions
• You are retrofitting into an existing home that already has duct infrastructure in place

Choose electric underfloor heating if:

• You are renovating individual rooms — particularly bathrooms, kitchens, or bedrooms. Our bathroom underfloor heating the full process for the most common Australian renovation.
• You want targeted room heating that is affordable to install and costs almost nothing to maintain
• You live in an apartment or townhouse where a whole-home system is not feasible
• You want to choose the best floor covering to maximise performance — read our guide to the best flooring for underfloor heating.

Choose hydronic underfloor heating if:

• You are building a new home or undertaking a major whole-home renovation
• You are in Victoria, Tasmania, the ACT, or any alpine or cool-climate region where heating is the primary year-round concern
• You want whole-home warmth, solar compatibility, and long-term running cost efficiency. See our full comparison of electric vs hydronic underfloor heating for a detailed breakdown of both options.
• You want a system with no visible hardware, no duct network, and no refrigerant in the roof space

Whatever your situation, Comfort Heat will give you honest advice. If underfloor heating is not the right fit for your project, we will tell you. That honesty is the foundation our business has been built on for over 25 years.

"Use the Comfort Heat Product Finder to get a personalised system recommendation based on your home, floor covering, and project type"

"Want to talk through your options with a specialist? Contact the Comfort Heat team today for a free consultation. Every quote includes a custom design layout at no extra charge — the only heating company in Australia to offer this as standard."