Comparing Ducted Air-Conditioners for Heating

Buyers Guide: Ducted Air Conditioners for Heating in Cool Climates

Last Updated: 2026-08-09

Key Takeaways

In a cool climate, judge a ducted air conditioner on its cold-zone heating stars. The headline average on the Zoned Energy Rating Label (ZERL) can hide cold-weather performance.
An inverter compressor with R32 refrigerant tends to hold heating output further down the temperature scale than an older fixed-speed system with R410A.
Coefficient of Performance (COP) and Heating Seasonal Performance Factor (HSPF) both describe heat delivered per unit of electricity. HSPF averages across a season, so it suits a cool heating climate zone.
Zoning with motorised dampers can reduce heating energy use by 20–40%, because the system then conditions only the rooms you use.
Whole-house air flow — return air paths, supply outlets, and duct insulation — can affect thermal comfort and energy efficiency as much as the unit itself.
Dry mode and a humidity sensor help you manage indoor humidity in the shoulder seasons without over-cooling the house.
Size the system from a calculated heating load rather than from floor area alone. Our heating load guide sets out the method.

What to Consider when Comparing Ducted Air-Conditioners

A ducted air conditioner uses one outdoor unit and an indoor fan coil to deliver conditioned air to several rooms through ducts. In Ballarat, Bendigo, and the wider Central Highlands, the questions that matter most are about heating, not cooling. The chart below shows the midpoint of each model's manufacturer-rated heating COP, taken from the comparison table later in this guide.

The Rating Problem in a Cool Climate

The older single-number energy label averaged performance across climates that are nothing like the Central Highlands. The Zoned Energy Rating Label (ZERL) replaced it with separate heating and cooling stars for three climate zones: hot, average, and cold. For a cool-climate home, the cold-zone heating stars — printed in red — are the figure that matters most.

Compare the cold-zone heating stars. Two units with the same average ZERL rating can perform very differently through a Ballarat or Bendigo winter.

Inverter Compressor and Refrigerant Choices for Cool-Climate Heating

Nearly every new ducted air conditioner uses an inverter compressor, and most now use R32 refrigerant. The figures below are manufacturer-rated, so real performance varies with installation, sizing, and weather.

Features of an Inverter Compressor

Variable speed: The compressor modulates its output instead of cycling on and off. This can reduce energy consumption by up to 30% compared with a fixed-speed design (manufacturer-rated).
Steadier temperatures: The system holds the room closer to your setpoint, which usually improves thermal comfort.
Lower start-up draw: A softer compressor start suits a home that runs rooftop solar or a home battery.
Quieter running: Lower fan and compressor speeds usually mean a lower noise level, both indoors and at the outdoor unit.

Features of R32 Refrigerant against Older R410A

Cold-weather range: Manufacturers rate many R32 systems for useful heating down to about -15°C, and some to -20°C. R410A systems can begin to lose output below about -10°C.
Heating efficiency: Manufacturer data suggests R32 can give roughly 6–12% better heating performance than R410A in cold conditions. Independent verification is limited.
Global warming potential: R32 has a global warming potential of 675, against about 2,088 for R410A. The difference matters if the refrigerant leaks over the life of the system.
Defrost behaviour: Every heat pump runs a defrost cycle in cold, damp weather, often every 30–90 minutes. R32 systems generally finish defrost more quickly.

Zoning — How to Heat Only the Rooms You Use

Zoning is often the largest running-cost lever a ducted system offers. Conditioning only the rooms in use can reduce heating energy consumption by 20–40% compared with heating the whole house every run.

Ways to Achieve Zoning

Motorised zone dampers: These sit inside the ductwork. They open and close to send air to the zones the controller has selected.
Per-zone setpoints: A zone controller can hold the bedrooms a couple of degrees cooler than the living areas.
Room temperature sensors: Sensors in each zone report real room temperatures, instead of the controller reading only the return air.
Bypass dampers: A bypass damper relieves excess static pressure back to the return air when few zones are open, which protects the indoor unit.
Scheduling and smart controls: You can pre-heat a zone around your occupancy patterns and around time-of-use electricity tariffs.

Air Flow Through the Whole House

The unit is only part of the system, because the ductwork decides how much heat reaches each room. Ducts that are undersized, poorly sealed, or run through an uninsulated roof space can lose a large share of that heat.

Return air matters as much as supply air. If the return grille cannot pull enough air back to the unit, static pressure rises, air flow falls, and energy efficiency suffers. Reducing the heating load with envelope measures such as cellular window blinds also lets the unit run longer at a low fan speed.

Air Flow Features Worth Asking About

Duct insulation: Ducts in a cold roof space lose heat through the duct wall, so ask what insulation rating the quote includes.
Return air grille size: A generously sized return grille lowers static pressure and lowers noise level.
Supply outlet placement: Outlets that wash warm air across a room, rather than dump it in the centre, improve perceived thermal comfort.
Door undercuts or transfer grilles: These help return air find its way back to the central grille when bedroom doors are closed.
Static pressure budget: Ask the installer what static pressure the system is designed for, and whether the duct layout fits within it.

Dry Mode, Humidity, and the Humidity Sensor

Dry mode runs the compressor at low speed mainly to remove moisture rather than to cool the air. It is most useful in the shoulder seasons, when a damp autumn morning leaves the house clammy but not cold.

What Dry Mode and a Humidity Sensor Add

Dry mode: This mode can bring indoor humidity towards the 30–50% band that comfort guidance generally associates with healthy indoor air.
Humidity sensor: A built-in humidity sensor lets the system start dry mode by itself, instead of waiting for you to see condensation on the windows.
Room-by-room damp: For persistent moisture in one room, our dehumidifier buyers guide covers appliances that work alongside a ducted system.

Practical Features to Look For

Use these points when you compare quotes and spec sheets, alongside our other buyers guides on cutting the heating load:

Practical Features Checklist

Cold-zone heating stars: The ZERL figure that matches a cool heating climate zone.
Coefficient of Performance (COP): Heat output divided by power input at one rated test point. Higher-spec inverter ducted systems often rate at 4.1–5.0 for heating.
Heating Seasonal Performance Factor (HSPF): Seasonal heating efficiency, which suits like-for-like brand comparisons better than COP alone.
Energy Efficiency Ratio (EER): Cooling efficiency at one test point. It matters less to a heating-first buyer, but it is worth recording.
Minimum operating temperature: Check that the rated minimum outdoor temperature covers your local winter lows.
Inverter compressor and refrigerant: R32 with a variable-speed inverter compressor is the common cool-climate choice today.
Zoning capability: Ask about the number of zones, the motorised dampers, and per-zone temperature sensing.
Dry mode and humidity sensor: Useful for managing humidity through the shoulder seasons.
Noise level: Indoor units typically run at 20–40 dBA, and outdoor units at 50–60 dBA.
Heating capacity against heating load: Roughly 1.1–1.4 kW of heating output per 10 m² is a common starting rule of thumb.

Energy Assessment to Right-Size Your Ducted System

A ducted system is a whole-home decision, because its capacity, its zones, and your insulation all interact. Independent professional advice, or a whole-home energy assessment, can help you right-size the system before you commit to a quote.

If you would rather have a professional turn all of this into a clear, costed plan for your home, find out more about how our Energy Assessments can help you.

Frequently Asked Questions

What is a ducted air conditioner? It is one outdoor unit plus an indoor fan coil that sends conditioned air to several rooms through ducts. In heating, it works as a reverse-cycle heat pump.
Is a ducted air conditioner a good heater in a cool climate? Modern inverter models carry manufacturer ratings for useful heat well below 0°C, so many cool-climate homes use one as the main heat source.
Which ZERL rating should I look at for heating? Look at the cold-zone heating stars on the Zoned Energy Rating Label, printed in red. That zone represents the coldest of the three heating climate zones.
What does COP mean for a cool-climate home? Coefficient of Performance is heat output divided by electrical power input at a rated test point. A COP of 4.0 means 4 kW of heat for 1 kW of electricity.
What is the difference between COP and HSPF? COP measures efficiency at one test point. Heating Seasonal Performance Factor averages efficiency across a heating season, so it tracks winter running costs more closely.
Does the Energy Efficiency Ratio matter if I mainly want heating? EER describes cooling efficiency at one test point, so it matters less to a heating-first buyer. It is still worth recording when you compare models.
Why does an inverter compressor suit cool-climate heating? An inverter compressor varies its speed to match demand instead of cycling on and off. That steadier output usually improves thermal comfort and reduces energy consumption.
Is R32 refrigerant better than R410A for heating? Manufacturer data suggests R32 can hold heating performance to lower outdoor temperatures. R32 also has a much lower global warming potential, at 675 against about 2,088.
How cold can it get before a ducted heat pump stops heating? Many R32 ducted systems carry a manufacturer rating for useful heating to about -15°C. Check the rated minimum outdoor temperature for the exact model.
What is a defrost cycle? In cold, damp weather the heat pump briefly reverses to clear frost from the outdoor coil, often every 30–90 minutes. Heating pauses for a few minutes each time.
How much can zoning save? Conditioning only the rooms in use can reduce heating energy consumption by 20–40% compared with heating the whole house. The saving depends on how you use the zones.
What equipment do I need for zoning? Zoning needs motorised dampers in the ductwork and a zone controller. Per-zone temperature sensors and a bypass damper are common additions.
Why does return air matter in a ducted system? The system must pull back as much air as it supplies. A small return grille raises static pressure, lowers air flow, and reduces energy efficiency.
Does duct insulation change running costs? Ducts that run through a cold roof space lose heat through the duct wall. Better insulated and sealed ducts deliver more of the heat you have paid for.
What does dry mode do? Dry mode runs the compressor at low speed mainly to remove moisture from the air, rather than to cool the room.
Do I need a humidity sensor? A humidity sensor lets the system start dry mode automatically when indoor humidity rises. Without one, you select dry mode by hand.
How noisy is a ducted air conditioner? Indoor units typically run at 20–40 dBA and outdoor units at 50–60 dBA. Fan speed, duct design, and mounting all change the noise level you hear.
How do I size a ducted system for my home? Size it from a calculated heating load, not from floor area alone. For step-by-step instructions, see our heating load calculation guide.
Should I choose ducted or split systems? That depends on how many rooms you need to condition and on your budget. Our split-system buyers guide compares the two approaches.
Do government rebates apply to a ducted air conditioner? Rebate rules are set by government schemes, not by your installer, and eligibility often differs between ducted and single-room systems. Check the current criteria for your state and your system type before you assume you qualify.

Printable Checklist for Comparing Ducted Air-Conditioners

Use this checklist when you compare quotes, talk to installers, or short-list models. Print it and fill in the right-hand column for each system you consider.

Feature	Specification / Value	Your Notes / Assessment
Identification
Brand
Model number
Year of release
Indicative installed price (AUD)
Warranty (years)
Performance
Rated heating capacity (kW)
Rated cooling capacity (kW)
Rated power input (kW)
Cold-zone ZERL heating stars
Cold-zone ZERL cooling stars
Coefficient of Performance (COP) — heating
Heating Seasonal Performance Factor (HSPF)
Energy Efficiency Ratio (EER) — cooling
Minimum outdoor operating temperature (°C)
Refrigerant type and GWP
Inverter compressor (yes / no)
Zoning & Distribution
Number of zones supported
Motorised dampers included
Per-zone temperature sensors
Bypass damper required
Duct insulation rating
Return air grille size
Design static pressure

Controls & Comfort
Dry mode available
Humidity sensor
Wi-Fi / app control
Scheduling / weekly timer
Indoor unit noise level (dBA)
Outdoor unit noise level (dBA)
Overall Assessment
Suits my heating climate zone
Fits my heating load (kW)
Estimated annual running cost
Notes

Ducted Air-Conditioner Models from Leading Brands Compared

IMPORTANT: We have no affiliation with and do not recommend or endorse any of the Brands listed below. And the Specifications and Prices of these Models (although correct to the best of our knowledge at the time of publication) are subject to change at any time by Manufacturers and Retailers. So please take these as a Starting Point for Your Own Research ...

How to Use the Comparison Table Below

The table is a starting point for a short-list, not a buy list. Specifications are manufacturer-rated unless noted otherwise, and prices are indicative installed prices in AUD at the date shown below the table. Cross-check the heating capacity column against your own figures from our heating load calculation guide.

How to Read the Table

Brand / Model: Brand shown above, model name shown in bold below.
Capacity (kW): Range from minimum to maximum rated heating and cooling output.
ZERL Stars (Cold): Cold-zone heating stars, the key figure for a cool heating climate zone.
COP: Heating Coefficient of Performance at rated conditions.
HSPF: Heating Seasonal Performance Factor across a heating season.
Refrigerant: R32 or R410A. R32 is the common choice for new cool-climate systems.
Zoning: Maximum number of zones the controller supports.
Min Op Temp (°C): Minimum outdoor temperature at which the rated heating performance applies.
Noise (dBA): Indoor unit sound pressure at low fan speed.
Price (AUD): Indicative installed price. Verify it locally.
Notes: A short summary of how the manufacturer positions the model.

Brand / Model	Capacity (kW)	ZERL Stars (Cold)	COP	HSPF	Refrigerant	Zoning	Min Op Temp (°C)	Noise (dBA)	Price (AUD)	Notes
Mitsubishi Electric
Mitsubishi Electric PEAD Ducted Inverter	7.1 – 14.0	4.0 – 4.5	4.1 – 4.6	~9.0	R32	up to 8	-15	28 – 34	$13,000 – $18,000	The manufacturer positions this range for consistent cold-climate heating. Rated indoor noise level is the lowest in this table. Installer feedback and user reviews commonly describe the range as reliable.
Daikin
Daikin FDYQ Premium Inverter	8.5 – 16.0	4.0 – 5.0	4.2 – 4.8	~9.2	R32	up to 10	-15	30 – 36	$14,000 – $20,000	Wide capacity range. Cold-zone ZERL stars are highest on the larger models in this range. Integrated zone controller options.
Fujitsu
Fujitsu ARTG Ducted Inverter	7.1 – 14.0	3.5 – 4.5	3.9 – 4.5	~8.7	R32	up to 8	-15	29 – 35	$11,000 – $16,000	Competitively priced. Mid-range cold-climate performance. Broad installer network in regional Victoria.
Panasonic
Panasonic S-Series Ducted Inverter	6.0 – 12.5	3.5 – 4.5	4.0 – 4.6	~8.8	R32	up to 8	-15	29 – 35	$12,000 – $17,000	Rated heating COP holds up on the smaller units. Suits medium-sized cool-climate homes.
ActronAir
ActronAir Advance Series Ducted	7.0 – 20.0	3.5 – 4.5	3.9 – 4.4	~8.6	R32	up to 8	-15	32 – 38	$12,500 – $19,000	Australian-designed for local conditions. Wide capacity range for large homes. Integrated zone controller.
Indicative installed prices in AUD as at 2026-05-26. All specifications are manufacturer-rated and may vary by model variant — verify them with the supplier before buying.

Glossary

Air conditioner: A reverse-cycle heat pump that can both heat and cool. It moves heat between indoor and outdoor air with a refrigerant cycle.
Coefficient of Performance (COP): Heating efficiency at a single rated test point — the ratio of heat output to electrical input. A COP of 4.0 means 4 kW of heat for 1 kW of electricity.
Defrost cycle: A short reversal of the heat pump cycle that clears frost from the outdoor coil. It runs every 30–90 minutes in cold, damp weather.
Dry mode: An air-conditioner mode that runs the compressor at low speed mainly to remove indoor humidity rather than to cool the air.
Ducted air conditioner: A single outdoor unit plus an indoor fan coil that delivers conditioned air to several rooms through insulated ductwork.
Energy Efficiency Ratio (EER): Cooling efficiency at a single rated test point — the ratio of cooling output to electrical input.
Global Warming Potential (GWP): A relative measure of the heat a greenhouse gas traps compared with carbon dioxide (CO2 = 1) over 100 years. R32 has a GWP of 675, against about 2,088 for R410A.
Heating climate zone: One of the three ZERL climate zones (hot, average, and cold) used to rate heating performance under conditions representative of that zone.
Heating Seasonal Performance Factor (HSPF): Heating efficiency averaged across a representative heating season. It is a better seasonal indicator of thermal efficiency than COP for a cool climate.
Humidity: The amount of water vapour in the air. Relative humidity in the 30–50% range is generally associated with comfort and healthy indoor air.
Humidity sensor: A built-in sensor that lets the air conditioner monitor indoor humidity and start dry mode automatically.
Inverter compressor: A variable-speed compressor that modulates its output to match heating or cooling demand, rather than cycling on and off at full power.
Power input: The electrical power (in kW) the system draws to deliver its rated heating or cooling output. It is used with heating capacity to calculate COP.
Refrigerant: The working fluid in a heat pump that absorbs and releases heat as it changes phase. R32 is the current standard for new systems, and older systems use R410A.
Return air: The air the ducted system draws back from the house through a return grille, so that the fan coil can condition it again.
Static pressure: The resistance the fan must overcome to push air through the ducts, grilles, and filters. High static pressure lowers air flow and raises noise.
Thermal comfort: The subjective sense of being neither too hot nor too cold. Air temperature, humidity, air movement, and radiant temperature all influence it.
Zoned Energy Rating Label (ZERL): The current Australian energy rating label for air conditioners. It shows separate heating and cooling star ratings for the hot, average, and cold climate zones.
Zoning: Dividing a ducted system into independently controlled groups of rooms with motorised dampers and a zone controller.