Perth summers don’t leave much room for guesswork, and neither should your cooling budget. If you’re weighing up Evaporative Air Conditioning Perth pricing before the next heatwave lands, you’re already asking the right question. Costs vary more than most homeowners expect, and getting a feel for the numbers upfront makes the whole process easier.
This guide breaks down Evaporative Air Conditioning installation costs for 2026, covering everything from single-unit setups to full ducted systems across different home sizes. We’ll also look at what drives the price up or down, so you’re not caught off guard when a quote lands in your inbox.
How Much Does Evaporative Cooling Cost in Perth?
As a general guide, most Perth homeowners can expect to pay somewhere between $2,500 and $9,500 for an evaporative cooling installation, depending on the system type, home size, and how much work is involved in getting it fitted.
A smaller, single-outlet unit sits at the lower end of that range. A full ducted system covering a larger home, with multiple outlets and more complex roof work, sits toward the top. It’s a wide bracket, which is exactly why the rest of this guide breaks it down further.
These are indicative figures only. The real number for your home depends on a site assessment, so treat this as a starting point for budgeting rather than a fixed quote.
How Much Does Ducted Evaporative Cooling Cost?
Ducted evaporative cooling is the most common setup for Perth homes, and it typically costs more than a single-unit system because it involves ductwork, multiple ceiling outlets, and a larger rooftop unit to move air through the whole house.
For most established homes, ducted evaporative cooling installation cost sits somewhere between $4,500 and $8,500, though larger properties or trickier roof layouts can push that higher. The final figure comes down to the size of the unit needed, the number of outlets, and how straightforward the roof access is.
What Does Installation Normally Include?
A proper evaporative cooler installation in Perth isn’t just bolting a unit to the roof. A standard install typically covers:
- Supply of the evaporative cooling unit
- Roof mounting and weatherproofing
- Ductwork and ceiling outlet fitting
- Water supply connection
- Electrical connection and wiring
- Controller or thermostat setup
- Testing and airflow balancing
Some quotes also include removing an old unit if you’re replacing an existing system. It’s worth asking exactly what’s covered before comparing quotes, since a lower price sometimes means less is included.
Most residential installations are completed within a day, though larger homes or more complex roof work can take longer.
How Much Does a System Cost for a 3-Bedroom Home?
For a typical 3-bedroom home, a ducted evaporative cooling installation cost generally lands between $4,500 and $6,000. This usually covers a mid-sized unit with enough outlets to cover living areas and bedrooms, standard roof access, and a straightforward install.
Homes with an open-plan layout or fewer internal walls sometimes come in at the lower end, since airflow doesn’t need to travel through as many separate rooms.
How Much for a 4-Bedroom Home?
A 4-bedroom home usually needs a larger capacity unit and more outlets to keep airflow consistent throughout the house. Expect an evaporative air conditioning price of roughly $6,000 to $8,500 for a typical 4-bedroom installation.
Two-storey 4-bedroom homes tend to sit at the higher end of that range, for reasons we’ll get into next.
How Does the Number of Outlets Affect Cost?
Every extra ceiling outlet means more ductwork, more fitting time, and sometimes a larger unit to keep the airflow strong across the whole system. As a rough guide, each additional outlet beyond a standard configuration can add somewhere in the vicinity of $150 to $350 to the total cost.
This is one of the main reasons two identical-sized homes can end up with different quotes. A home with an open floor plan might only need 6 to 8 outlets, while a home with lots of separate rooms could need 10 or more to cool properly.
Does a Two-Storey Home Cost More?
Generally, yes. Two-storey homes usually cost more to fit out with evaporative cooling because ductwork needs to reach a second level, which often means longer duct runs, more outlets, and sometimes additional fan support to maintain airflow to upstairs rooms.
Depending on the layout, a two-storey home can add anywhere from $1,000 to $2,500 on top of a comparable single-storey install.
Does Roof Access Affect Installation Costs?
It can, and it’s one of the more overlooked cost factors. A straightforward, easily accessible tile or Colorbond roof with clear space around it makes for a faster, cheaper install. A steep pitch, limited access, an older roof needing extra bracing, or a tricky roof cavity can all add time and labour to the job.
If your home has an unusual roofline or you’re not sure how accessible your roof space is, it’s worth flagging this when you request a quote so the price reflects the actual job rather than a best-case estimate.
How Much Does Replacing an Existing Unit Cost?
Replacing an old evaporative cooling unit is usually cheaper than a brand-new installation, since the ductwork, outlets, and water connection are often already in place. A straightforward like-for-like replacement typically costs between $3,000 and $5,500, depending on the size and brand of the new unit.
If the existing ductwork is old, damaged, or undersized for a new unit, some rework may be needed, which can add to the cost. This is something we always check before quoting a replacement.
Which Evaporative Brands Are Cheapest?
Entry-level and mid-range brands tend to sit at the more affordable end of the market. Brands like Ezycool and Cool Breeze are generally positioned as budget-friendly options, offering solid performance for homeowners who want reliable cooling without the premium price tag.
Which Evaporative Brands Are Most Expensive?
Premium brands like Breezair and Braemar (both part of the Seeley International group) typically sit at the higher end of the market. Bonaire and Seeley models also tend to cost more than entry-level options. These brands are generally built with more durable components, quieter operation, and stronger performance in Perth’s dry heat, which is part of why they carry a higher price tag.
The right brand for your home depends on budget, house size, and how hard you plan to run the system. If you want a clear breakdown of which brand suits your situation, our team can walk you through it.
Is Evaporative Cooling Cheaper to Install Than Ducted Reverse Cycle?
In most cases, yes. Evaporative cooling installation is generally less expensive upfront than a comparable ducted reverse cycle system, largely because evaporative units are mechanically simpler and don’t require a compressor-based refrigeration cycle.
Ducted reverse cycle systems often cost more to install and run, though they offer heating as well as cooling and don’t require windows to be left open. Evaporative cooling tends to have lower running costs in Perth’s dry climate, which is part of why so many local homes stick with it. If you’re weighing up both options, our evaporative air conditioning and residential air conditioning pages break down how each system works.
Get an Accurate Quote for Your Home
Every home is different, and the numbers above are a starting point, not a final price. Roof access, home layout, existing ductwork, and the brand you choose all move the number up or down.
At Refrigwest, we assess your home properly before we quote, so the price you’re given actually reflects the job. No guesswork, no surprise add-ons halfway through. Getting a quote doesn’t commit you to anything either, so there’s no downside to finding out where your home lands.
Get a free quote or call 1300 164 217 to talk to our team about your evaporative cooling installation.
