Reverse cycle air conditioning is a single climate-control system that can both cool your home in summer and heat it in winter by reversing the direction of its refrigeration cycle — meaning one tidy unit (or one ducted system) handles year-round comfort instead of needing a separate air conditioner and heater. It works by using a four-way reversing valve to flip the flow of refrigerant inside the system: in summer it pulls heat out of your indoor air and dumps it outside, and in winter it absorbs heat from the outdoor air (yes, even cold air contains usable heat) and releases it inside the home. Because it moves heat rather than burning fuel or running a resistance element, reverse cycle is the most energy-efficient form of household heating and cooling available in Australia today, typically delivering 3 to 5 kilowatts of cooling or heating for every 1 kilowatt of electricity consumed.
If you’ve been comparing air conditioners and keep seeing “reverse cycle” mentioned in product specs, brochures, and salesperson pitches, this guide breaks down exactly what it means, how it works, what it costs to run, and whether it’s the right choice for your Queensland home — without the technical jargon.
A common misconception is that an air conditioner “creates” cold air, and a heater “creates” warmth. Reverse cycle systems do neither — they simply move heat from one place to another, which is why they’re so much more efficient than traditional electric heaters or gas furnaces. The same physics that runs your fridge runs every reverse cycle system in Australia.
In cooling mode, the indoor unit’s fan draws warm room air across a cold evaporator coil. Inside that coil, low-pressure liquid refrigerant evaporates and absorbs the heat — the air leaving the coil is now noticeably cooler. The refrigerant, now a warm gas, travels outside through an insulated copper line. At the outdoor unit, the compressor squeezes that gas to high pressure, the outdoor fan blows ambient air across a coil, and the heat is dumped to the atmosphere. The refrigerant condenses back to a liquid and the cycle repeats.
In heating mode, a clever component called a four-way reversing valve flips the direction of refrigerant flow. Now the outdoor coil acts as the evaporator (absorbing heat from the outdoor air) and the indoor coil acts as the condenser (releasing that heat into your home). Because heat exists in air even at temperatures as low as -10°C, reverse cycle systems remain effective in winter — and they deliver several times more heat output than the electricity they consume.
This efficiency is measured by the COP (Coefficient of Performance) for heating and the EER (Energy Efficiency Ratio) for cooling. A modern inverter reverse cycle system typically has a COP between 3.5 and 5.0, meaning every $1 of electricity produces $3.50 to $5.00 worth of heat. By contrast, a plug-in oil column heater has a COP of exactly 1.0 — every $1 of electricity buys $1 of heat — which is why reverse cycle is widely considered the cheapest form of household heating in Australia.
Not every air conditioner is reverse cycle. Some are cooling-only, meaning they can only run the cycle in one direction — they cool in summer but can’t heat in winter. Cooling-only units are typically a few hundred dollars cheaper to purchase, but they lock you in to needing a separate heater for the cooler months.
For most Australian homes — and especially for the variable Queensland winters where you might want a touch of warmth on a 12°C July morning — reverse cycle is the smarter long-term buy. The price difference between a cooling-only and a reverse cycle unit is usually $200 to $500, while the cost of buying and running a separate plug-in or gas heater far exceeds that difference within the first winter.
Climate Solution | Cooling | Heating | Running Cost (per hour) | Efficiency (COP) | Best Suited For |
Reverse Cycle Split System | Yes | Yes | $0.20 – $0.60 | 3.5 – 5.0 | Year-round single-room comfort |
Reverse Cycle Ducted | Yes | Yes | $1.20 – $3.50 | 3.5 – 5.0 | Whole-home year-round comfort |
Cooling-Only Split | Yes | No | $0.20 – $0.60 | 3.0 – 4.5 | Summer-only use |
Plug-in Oil Column Heater | No | Yes | $0.50 – $0.90 | 1.0 | Occasional, low-use rooms |
Gas Ducted Heating | No | Yes | $1.50 – $3.00 | 0.85 – 0.95 | Cold climates, heat-only homes |
Wood Fire / Combustion | No | Yes | Variable | 0.65 – 0.80 | Acreage, off-grid living |
For southeast Queensland homes where summers are long and winters are short but cool, reverse cycle wins on every practical measure. If you’re weighing up options for your home, the team at our north lakes store can run through capacities and pricing for you on the spot.
Reverse cycle air conditioning comes in two main formats, and the choice between them comes down to how many rooms you want conditioned and your budget for installation.
A reverse cycle split system is a two-part unit — one indoor head unit mounted on an interior wall, and one outdoor condenser mounted outside — connected by insulated copper refrigerant lines. Each split serves one room (or one open-plan zone). They’re quick to install (3–4 hours typically), affordable, and ideal for bedrooms, home offices, granny flats, and single living areas. Most modern split systems sold in Australia today are reverse cycle by default.
A reverse cycle ducted system uses a single large indoor fan coil unit (usually hidden in the roof cavity) connected to insulated ductwork that runs to vents in multiple rooms. One large outdoor condenser sits outside, and the system is typically zoned with motorised dampers so you can run only the rooms you need. Ducted is the premium whole-of-home solution — invisible, powerful, and beautifully discreet — but it’s a bigger investment, usually $9,000 to $25,000 fully installed depending on home size.
For one or two rooms, a split system is almost always the smarter buy. For four or more rooms running simultaneously, ducted starts to make more sense. If you’d like a fixed-price written estimate for either option, you can request a split system quote or ducted air conditioner quotes online and the team will get options back to you within hours.
A modern inverter reverse cycle split system typically draws between 0.5 and 2.5 kilowatts of electricity in cooling mode, and slightly less in heating mode. In southeast Queensland, with electricity sitting around 28 to 35 cents per kilowatt-hour, that translates to:
A 2.5 kW unit costs roughly $0.20 to $0.30 per hour. A 5.0 kW unit costs $0.40 to $0.60 per hour. A 7.1 kW unit (typical for a large open-plan living area) costs $0.55 to $0.85 per hour. Reverse cycle ducted systems with multiple zones running typically cost $1.50 to $3.50 per hour — but with smart zoning, you’d rarely run the entire system at once.
The efficiency advantage really shines in winter. A reverse cycle split heating a 25 m² bedroom to 22°C on a 10°C Brisbane morning typically costs $0.20 to $0.35 per hour — compare that to an oil column heater attempting the same job for $0.70 to $0.90 per hour, and the reverse cycle system pays for itself in a single winter.
A few practical habits drop running costs further by 15 to 25 percent: set your thermostat sensibly (24–26°C in cooling, 20–22°C in heating), keep doors closed, clean filters monthly, use the timer function, and book a professional service every 12 to 24 months.
System Size | Cooling Mode (per hour) | Heating Mode (per hour) | Annual Cost (typical SEQ home) | Best Suited For |
2.0 – 2.5 kW Split | $0.18 – $0.28 | $0.15 – $0.25 | $180 – $280 | Small bedroom, study |
3.5 kW Split | $0.28 – $0.42 | $0.22 – $0.35 | $280 – $420 | Standard bedroom |
5.0 kW Split | $0.40 – $0.60 | $0.32 – $0.48 | $400 – $600 | Living room |
7.1 – 8.0 kW Split | $0.55 – $0.85 | $0.45 – $0.70 | $550 – $800 | Open-plan kitchen/lounge |
10 – 14 kW Ducted | $0.80 – $1.80 | $0.65 – $1.50 | $750 – $1,500 | Whole-home (3-bed) |
16 – 22 kW Ducted | $1.20 – $3.50 | $1.00 – $2.80 | $1,200 – $2,800 | Whole-home (4–5 bed) |
Annual figures assume average Queensland use (around 5 hours of cooling per day in summer, 3 hours of heating per day in winter, with the rest of the year minimal use).
Brand matters more than most homeowners realise — the compressor is the most expensive component to replace, and brands with deeper service networks and longer warranties protect you years down the track. Daikin is the global market leader and the most consistently top-rated reverse cycle brand in Australia. Mitsubishi Electric leads on whisper-quiet operation and sophisticated zoning. ActronAir is the only major Australian-designed and Australian-built option, purpose-engineered for harsh local climates. Fujitsu offers the strongest mid-tier value with reliable inverter performance and competitive 5-year warranties. Panasonic stands out for households with allergies thanks to its nanoe-X air-purification technology.
Modern reverse cycle systems also integrate beautifully with smart home platforms, letting you control your air conditioning from your phone, your voice assistant, or a wall-mounted touchscreen. For ducted systems, controllers like AirTouch 5 offer next-generation zoning where each zone can have its own target temperature, and platforms like LG ThinQ tie reverse cycle units into broader smart-home ecosystems. If you’re keen on full smart-home control, our smart home air conditioning page walks through the most popular options for both new and existing systems.
For a standard back-to-back reverse cycle split install, expect 3 to 4 hours from arrival to handover. The crew mounts the indoor backplate, drills the wall penetration, fits the outdoor unit, runs the refrigerant lines, completes the licensed refrigeration and electrical work, vacuum-tests the lines, charges the system, and walks you through the controller before leaving. Reverse cycle ducted installs typically take 1 to 2 days depending on home size and the number of zones.
Ongoing maintenance is straightforward. Clean the indoor filters every 4 to 8 weeks during heavy-use seasons, keep the outdoor unit clear of leaves and overgrown plants, and book a professional service every 12 to 24 months. You can book a service online in under two minutes — our techs cover every major brand across Brisbane, North Lakes, Sunshine Coast, Carindale and Moreton Bay. If your existing system is throwing error codes or just isn’t keeping up, our repair team handles full diagnostics across all major brands.
Reverse cycle air conditioning is, in plain terms, the most efficient and most flexible climate solution available to Australian homeowners — one tidy system that cools beautifully through Queensland’s long summers and heats efficiently through its short cool winters, all from a single piece of equipment. Whether you’re after a single split system for a bedroom or a fully zoned ducted system for the whole home, reverse cycle is the format that delivers the best balance of comfort, efficiency, and long-term value.
If you’d like help choosing the right system for your home, the AC Store team — led by Steve and James — supplies and installs reverse cycle air conditioners across Brisbane, North Lakes, Sunshine Coast, Carindale and Moreton Bay. Drop into one of our showrooms, request a free fixed-price quote online, or give the team a call. We’ll match you with the right system, complete the install with a fully licensed crew, and back it up with the after-sales support of a local Queensland family business.
These two terms describe completely different things, and the confusion is understandable because they’re often used together. A split system describes the physical design of the air conditioner — it’s “split” into two parts, one indoor unit mounted on the wall and one outdoor unit mounted outside, connected by refrigerant lines. Reverse cycle describes the function of the system — it can run its refrigeration cycle in two directions, so it can both cool and heat. So a single product can be (and most modern ones are) both a split system and reverse cycle at the same time.
There are four reliable ways to tell. First, check the remote control or controller — reverse cycle units have a clear “Heat” mode (often shown as a sun icon) alongside the “Cool” mode (snowflake icon). If the remote only has Cool, Fan and Dry modes with no Heat option, it’s a cooling-only unit. Second, look at the model number sticker on the indoor unit — most manufacturers include “RC” (reverse cycle), “H” (heating), or specific letter codes that indicate reverse cycle capability. Third, check the energy rating sticker on the outdoor unit — a reverse cycle system will have two star ratings printed (one for cooling, one for heating), while a cooling-only system will only show a cooling star rating. Fourth, try the heating mode — set the controller to Heat with a target temperature above the current room temperature; if the unit responds and starts producing warm air after a few minutes, it’s reverse cycle. If you’re still unsure, take a photo of the model number plate and our team can confirm in seconds.
Reverse cycle air conditioners are actually one of the least electricity-hungry climate solutions per unit of comfort delivered, thanks to their high COP. A modern inverter reverse cycle system has a COP of around 3.5 to 5.0, meaning for every 1 kilowatt of electricity it consumes, it produces 3.5 to 5 kilowatts of heating or cooling output. By comparison, a plug-in electric heater has a COP of exactly 1.0, and a gas heater is typically around 0.85 to 0.95 — so a reverse cycle unit produces three to five times more heat per dollar of electricity than the alternatives. In real Queensland use, a 5 kW reverse cycle split running for 5 hours a day in summer adds roughly $50 to $80 to a monthly power bill, while heating a single bedroom for an hour each evening through winter typically adds just $5 to $15 a month. The biggest factors that push electricity use up are oversized systems, poorly insulated rooms, unrealistic thermostat settings, dirty filters, and aged systems with worn compressors.
The five highest-impact habits for cutting reverse cycle running costs are: set sensible temperatures (24–26°C in cooling and 20–22°C in heating — every degree closer to outside ambient saves around 8–10% on running cost); use the timer function so the system isn’t running when no one’s home; close internal doors to limit the space being conditioned; clean the filters every 4 to 8 weeks (clogged filters increase electricity draw by 10–20%); and book an annual professional service. Beyond those, choose the right capacity for the room, look for an inverter-driven model with a high Star Rating, use ceiling fans alongside the air conditioner (you can usually push the thermostat 1–2°C higher with a fan running), and seal up obvious draughts.
A well-installed and properly maintained reverse cycle air conditioner will typically last 10 to 15 years, with premium brands (Daikin, Mitsubishi Electric) often pushing 15 to 20 years in residential use. The single biggest factor in longevity is the quality of the original installation — correct refrigerant charge, properly vacuumed lines, neat electrical work, and an outdoor unit positioned in shade with adequate airflow can add 3 to 5 years to a system’s lifespan. The second biggest factor is regular maintenance — monthly filter cleans, annual servicing, and prompt attention to early warning signs (unusual noises, ice on the indoor coil, water dripping from the head unit, error codes) prevent small issues from becoming compressor failures. Common signs your system is approaching end-of-life include rising electricity bills despite the same usage patterns, longer run times to reach target temperature, refrigerant leaks, increasingly noisy operation, and frequent error codes. Modern inverter systems generally last longer than older fixed-speed units. If your existing system is over 10 years old and starting to show its age, it’s often more economical to replace than to keep repairing — every system we install is backed by our warranty program with five years of parts and labour cover.
