Evaporative cooler pad replacement is the most frequent maintenance task Melbourne homeowners face beyond the annual service fee. The pads — water-saturated cellulose panels through which hot outside air passes — gradually accumulate mineral scale from Melbourne’s mains water and biological contamination from the warm, moist operating environment. When pads deteriorate, cooling performance drops and indoor air quality suffers. This guide covers pad types, replacement intervals, Melbourne 2025 costs, and a step-by-step DIY guide for accessible installations.
Types of Evaporative Cooler Pads
The large majority of Melbourne residential evaporative coolers — Brivis, Breezair, Climate Wizard, and older Seeley International models — use Chillcel cellulose pads. Chillcel is a rigid, honeycomb-textured paper-based material that absorbs and retains water while remaining structurally stable. The honeycomb cells create a large surface area for water-air contact, maximising evaporation efficiency.
50 mm vs 100 mm Chillcel
Standard residential pads are 50 mm thick. Some higher-performance models (primarily Seeley Climate Wizard and some Breezair Supercool models) use 100 mm thick pads that provide greater water retention and a higher evaporation efficiency rating. The 100 mm pads cost more per pad but may last slightly longer due to the greater depth of pad material absorbing scale before airflow is restricted.
Identifying the correct pad size
Pad dimensions vary by unit model and manufacturer. Always measure your existing pads before ordering (height x width x thickness in mm) or note the unit model number and confirm the pad specification. Incorrect pad dimensions leave gaps in the pad frame, reducing efficiency and potentially allowing uncooled air to bypass the pads.
When Pads Need Replacing in Melbourne
The primary indicator for pad replacement is a visual inspection at the start of each season in September. Look for:
- White or grey scale blocking the pad cells (calcium carbonate from Melbourne’s mains water)
- Structural breakdown of the cellulose material — the pad crumbles or breaks when handled
- Black discolouration or visible mould growth on the pad surface
- Musty or organic odour from the pads (even when not visually obvious)
- Reduced airflow from ceiling vents compared to previous seasons
In Melbourne’s eastern suburbs (Doncaster, Templestowe, Eltham, Ringwood) and northern suburbs (Greensborough, Bundoora, Epping) where mains water hardness is higher, annual pad replacement is often warranted. In inner Melbourne and the western suburbs where water is generally softer, two to three season life is achievable with good maintenance.
Pad Replacement Cost Melbourne 2025
All prices below are complete job prices for a standard residential rooftop unit on a single-storey home with accessible roof pitch — including the technician’s time on the roof, the correct pads for your unit, removal of old pads, frame and distributor inspection, new pad installation, and a system test. No hidden parts charges on top.
| Service | Complete Job Price (AUD) | Notes |
|---|---|---|
| Pad replacement — standalone service | $520 – $920 | Complete job; pads from $120 each, 3–8 pads depending on unit |
| Annual service + pad replacement (combined) | $650 – $1,200 | Most economical; one visit, shared roof access |
| Height / steep roof surcharge | $60 – $120 | Double-storey or pitch >25° |
Pad replacement bundled with the annual service is the most economical approach — avoiding a separate call-out. FreshDuct quotes the combined service as a single upfront price — call 0431 918 137 for a site-specific quote.
DIY Pad Replacement — Step by Step
For Melbourne homeowners with a single-storey home and moderate roof pitch, pad replacement is achievable without a technician. Allow two to three hours for a first-time job.
- Turn the system off at the wall controller and isolate the power at the switchboard.
- Turn off the water supply tap at the roof unit to prevent refilling while you work.
- Access the roof unit safely using a properly secured ladder. Never work alone on a roof.
- Remove the pad retaining clips or frame from one side of the unit. On most Brivis units, the pads slide out horizontally once the retaining bar is released.
- Remove the old pads and note any scale or debris in the sump area.
- Inspect and clear the water distributors (drippers or troughs at the top of the pad cavity). Use a pin to clear blocked dripper holes.
- Insert new pads in the correct orientation — the diagonal cells of Chillcel pads should face downward in the direction of water flow to maximise water retention.
- Replace retaining clips/frame, restore water supply and power, and test.
Extending Pad Life in Melbourne Conditions
The main pad life killers in Melbourne are mineral scale and biological contamination. Both can be moderated with good seasonal practice: use the bleed-off function where fitted (Brivis and Breezair units with electronic controllers have a bleed-off or dump cycle that periodically flushes concentrated mineral-laden water and replaces it with fresh supply); ensure the system is properly winterised each April/May (drained sump eliminates the stagnant water that promotes biological growth); and have the sump cleaned and descaled at each annual service before scale buildup reaches the pad level.
See our Brivis evaporative cooler service guide for model-specific pad information and service intervals.