Skill Level: Beginner
Quick Answer
Yes — you should shut down your evaporative cooler every Melbourne winter. The process takes under an hour: turn off the power and water, drain and clean the reservoir, wash the cooling pads, close all ceiling vents, and fit the roof cover. Skip it and you risk mould in the ducts, corroded components, and a smelly surprise when summer arrives. Best time: April. If you’re reading this in June — do it today.
Evaporative coolers are the workhorse of Melbourne summers — cheap to run, effective in dry heat, and common across SE suburbs from Dandenong to Frankston. But once May rolls around and you’ve switched to gas heating, that rooftop unit needs a proper winter shutdown or it’ll quietly rot over six months of cold, damp Melbourne weather.
This guide walks you through the full DIY process. It takes under an hour, costs nothing beyond a mild cleaning product, and will save you from a foul-smelling mess when you fire the system up next October.
What Happens If You Skip the Winter Shutdown?
Standing water in an idle evaporative cooler is a problem. Over a Melbourne winter — which regularly drops to 6–10°C overnight in suburban areas like Pakenham, Berwick, and Narre Warren — stagnant water in the reservoir and cooling pads breeds mould, algae, and bacteria. By the time you run the system again in spring, those spores circulate through every ceiling vent in your home.
Other risks from leaving the unit open and undrained include:
- Corroded pump basket and distributor channels — mineral deposits and rust form over winter, reducing water flow when you need it most
- Deteriorated cooling pads — cellulose pads that sit wet over winter break down and need full replacement rather than just a rinse
- Open ceiling vents — if you don’t close the duct vents throughout the house, cold air drafts through all winter, undoing any draught-proofing work and making your gas heater work harder
- Pest entry — an uncovered roof unit is an invitation for possums, mice, and wasps to nest in the housing over winter
What You’ll Need
| Item | Where to Get It | Approximate Cost |
|---|---|---|
| Evaporative cooler cover (brand-matched) | Reece, Total Tools, or direct from Breezair/Braemar dealer | $35–$65 |
| Bucket (10–15 litre) | Most hardware stores | Already owned by most |
| Soft-bristle brush or old toothbrush | Bunnings, Mitre 10 | $3–$8 |
| Mild dish soap or white vinegar | Supermarket | Already owned by most |
| Old rags or sponges | Bunnings | $5–$10 |
| Flat-head screwdriver | Already owned | — |
Step-by-Step: How to Winterise Your Evaporative Cooler
Step 1: Turn Off Power at the Controller and Switchboard
Start at the wall controller inside your home. Set the system to “off” or use the master power switch. Then go to your switchboard and flip the dedicated circuit breaker for the evaporative cooler (it’s usually labelled “evap”, “cooler”, or “AC”). This ensures zero risk of the pump activating while you’re working on the roof.
Step 2: Shut Off the Water Supply
Locate the isolation tap that feeds water to your evaporative cooler. On most Melbourne homes it’s either in the roof space near the unit, on the exterior wall near where the supply pipe exits, or under the eaves. Turn it clockwise to close. On newer units, the float valve and supply line are accessible from the top panel — you should see the water level in the reservoir drop to zero once the supply is cut.
Leave the tap in the closed position for the entire winter. Mark it with a small piece of tape labelled “open in October” if you think you’ll forget which tap it is.
Step 3: Drain and Clean the Water Reservoir
The reservoir sits at the base of the roof unit. Most models have a drain plug or bung at the lowest point — remove it and let the remaining water flow out through the drain hole (aim away from the roof sheeting to prevent rust staining). If your unit doesn’t have a drain plug, use a sponge or small cup to bail it out.
Once empty, scrub the reservoir walls and floor with a soft brush dipped in a solution of warm water and a dash of white vinegar or mild dish soap. This removes mineral scale, algae films, and any gritty sediment that builds up over summer. Rinse thoroughly and let air-dry for 10–15 minutes before reassembling.
Step 4: Remove and Wash the Cooling Pads
Cooling pads (also called filter pads or evaporative pads) are the wood-fibre or synthetic media panels that sit in the four sides of the unit housing. Slide them out and inspect them. If they’re intact, flexible, and free of mould, a rinse under a garden hose followed by air drying is sufficient. If they’re rigid, crumbling, heavily scaled with white mineral deposits, or have dark mould patches that won’t wash off, replace them before next summer rather than trying to rehabilitate them.
Standard replacement pads for common Melbourne brands: Breezair XVE/XTV pads run $15–$30 per side from Total Duct Cleaning or your local Breezair dealer in Pakenham or Dandenong South. Braemar and Brivis pads are similarly priced at Reece or direct from the manufacturer.
| Pad Condition | Action | Cost |
|---|---|---|
| Clean, intact, no mould | Rinse with hose, air dry, reinstall | Free |
| Scale buildup but structurally sound | Soak in vinegar solution, rinse, dry | Free |
| Mould patches, crumbling, rigid from calcium | Replace before spring startup | $15–$30/pad ($60–$120 full set) |
| Missing or completely degraded | Replace immediately | $60–$120 full set |
Step 5: Clean the Pump, Float Valve, and Distributor Channels
While the pads are out, rinse the distributor channels (the plastic troughs that drip water across the top of the pads) under a tap or hose. Use a toothbrush to clear any blocked drip holes — blocked channels cause uneven pad wetting and hot spots in summer. Check the float valve bobber moves freely without sticking.
Remove the pump from its housing (usually clips out without tools) and rinse the impeller chamber under running water. If the pump feels gritty or turns with resistance, an overnight soak in white vinegar usually clears mineral deposits. Dry and reinstall.
Step 6: Close All Ceiling Vents Throughout the House
This step makes the biggest difference to your heating bills. Every ceiling vent in your home — including rooms you rarely use — needs to be rotated to the closed position. On most standard Melbourne ducted evaporative systems, the vent plate has a small lever or a louvred disc that rotates 90°.
Step 7: Refit the Top Cover and Inspect for Damage
With the pads back in, the reservoir drained, and all panels secured, fit the weatherproof cover over the entire roof unit. Purpose-made covers (available from your cooler’s manufacturer or dealer) are UV-stabilised and fit snugly over the unit housing. A loose-fitting tarpaulin held with bungy cords works as a backup but tends to collect pooling water and can be lifted by SE Melbourne’s westerly winds.
While you’re on the roof, check the unit’s water supply pipe for any cracked insulation lagging, the condition of the roof flashing around the unit base, and whether the unit housing itself has any rust spots forming. Note anything that needs attention so you can address it before October’s startup service.
Should You Hire a Professional for the Winter Shutdown?
The DIY steps above are within reach of any homeowner comfortable getting on a roof safely. Victorian law does not require a licence for routine evaporative cooler maintenance — cleaning pads, draining reservoirs, and fitting covers. However, call a licensed HVAC technician if:
- The water supply line runs through fixed copper plumbing that needs a licensed plumber to isolate
- The unit is showing electrical faults — control board errors, pump not responding, or wiring that looks damaged
- You have a two-storey home where roof access requires a ladder over 3m (SafeWork Victoria recommends professional access above this height)
- The unit is older than 10 years and overdue for a full service inspection
| Professional Winterisation Service — Typical Costs Melbourne 2026 | Price Range |
|---|---|
| Basic winter shutdown (drain, cover, close vents) | $90–$140 |
| Full shutdown + pad inspection and clean | $140–$200 |
| Full shutdown + pad replacement (all four sides) | $220–$350 |
| Combined spring startup + prior winter shutdown | Often bundled at $180–$260 |
Troubleshooting Common Shutdown Problems
| Problem | Likely Cause | Fix |
|---|---|---|
| Reservoir won’t drain fully | Drain bung blocked by sediment | Clear with a small screwdriver or stiff wire; use a sponge to remove final water |
| Can’t locate the water isolation tap | Tap hidden in roof space or behind wall casing | Trace the copper pipe from the unit backwards; if in doubt, call a plumber |
| Cooling pads are stuck in the housing | Mineral deposits have bonded pad to frame | Gently work loose with a flat-head screwdriver; soak frame in vinegar solution if needed |
| Cover won’t fit snugly | Wrong size cover, or unit brand mismatch | Check your unit’s model number (on the inside of the top panel) and order the correct OEM cover |
| Ceiling vents won’t fully close | Old lever-type vents with worn stops | Fit magnetic vent covers ($8–$15 each at Bunnings) over the vent face |
Tips and Gotchas
- Never use bleach in the reservoir. Bleach residue degrades the plastic tank and rubber seals over time. White vinegar is cheaper and more effective for mineral scale.
- Label the water isolation tap. A simple piece of gaffer tape saying “Evap cooler — open Oct” saves 15 minutes of fumbling next spring.
- Don’t forget the remote rooms. Evaporative vents in spare bedrooms, studies, and hallways are often the ones left open — and they’re the biggest source of winter heat loss.
- Check your cover’s UV rating. Cheap blue poly tarpaulins degrade in less than one Melbourne winter. A UV-stabilised grey cover rated to 2 years UV exposure is worth the extra $10.
- Older units (pre-2010) may have asbestos-containing components in pipe lagging. If you see any white fibrous insulation material wrapped around pipes that crumbles when touched, stop work and call a licensed asbestos assessor. This is rare but possible in 1990s Pakenham and Cranbourne homes.
- Roof safety: In SE Melbourne’s wet winters, Colorbond roofing is slippery. Wear rubber-soled shoes, never go up in rain, and use a ladder stabiliser if working above 2m. If unsure, pay the $90–$140 for a pro.
- Spring startup check: When you open back up in October, run the system on “fan only” for 30 minutes before switching on the water — this clears any dust or pests that got past the cover.
- Self-draining models (Breezair Icon, Brivis Durango): These models drain automatically at shutdown and after each cycle. They still need pad inspection and cover fitment — the auto-drain only handles the reservoir water, not the pad condition or vent sealing.
Local Melbourne Resources
- Ideal Air Heating and Cooling — Melbourne-based evaporative cooler service and winterisation
- Reece Plumbing — replacement cooling pads, float valves, pump spares; branches across SE Melbourne (Dandenong, Frankston, Pakenham)
- Bunnings Warehouse — magnetic vent covers, replacement pads, white vinegar in bulk; Narre Warren, Cranbourne, Berwick stores
- Victoria SES — Storm Preparation — relevant if your roof needs inspection before winter storms
- Sustainability Victoria — Sealing Evaporative Cooling Outlets — free guidance on closing duct vents properly
FAQ
Do I really need to winterise if Melbourne winters are mild?
Yes. Melbourne’s June–August overnight temperatures regularly fall to 6–9°C in SE suburbs, which is cold enough to cause mould, bacterial growth, and mineral crystallisation in a stagnant water reservoir. The bigger risk isn’t freezing — it’s months of standing water growing contamination that then blows through your home next summer. A 45-minute shutdown prevents all of it.
My Breezair unit has an auto-winterise function — can I skip all this?
The auto-winterise on newer Breezair Icon and XVE models drains and dries the reservoir automatically. However, you still need to manually close all ceiling vents throughout the house, fit the roof cover, and inspect the cooling pads at least annually. Auto-drain does not replace pad maintenance or vent sealing.
How often should I replace the cooling pads?
In Melbourne, most cellulose pads last 3–5 years with annual cleaning. Synthetic (Chillcel) pads last 5–7 years. Replace earlier if you see crumbling, persistent black mould that won’t wash off, or a rotten-egg smell when the system runs. A set of four replacement pads for common Braemar or Brivis models costs $60–$120 from your local HVAC parts supplier.
What’s the difference between a spring startup and a winter shutdown service?
A winter shutdown focuses on draining, cleaning, covering, and protecting the unit over the cold months. A spring startup reverses the process — remove cover, inspect and replace pads if needed, flush the system, check the pump and float valve, and open the vents. Most Melbourne HVAC companies bundle both for $180–$260 per year, which is good value for an older or higher-spec unit.
Can I just leave the system switched off without doing a full shutdown?
No. Simply turning off the controller leaves standing water in the reservoir and open ceiling vents. Within weeks, stagnant water breeds mould and algae. Open vents allow cold air to draft through the house all winter, adding noticeably to your gas heating bills. The physical drain and vent-close steps are essential — you can’t replace them by just switching off the power.
When is the right time to reopen the system in spring?
Most Melbourne homeowners restart their evaporative cooler in October, when daytime temperatures begin consistently reaching 22°C+. Before the first run, open the water supply, remove the cover, check the pads, run on fan-only for 30 minutes to clear dust, then switch on the water pump. Book a professional spring service if the unit is more than 5 years old or if you skipped last year’s shutdown.
