DIY vs. professional heat pump cleaning: what's the difference?
Rinsing your filters is a good monthly habit. It's also the easiest 20% of the job. Here's what a pro clean adds.
What you can do yourself
Pop the cover, pull the filters, rinse them in warm soapy water, let them air-dry, reinstall. That's roughly 10 minutes and should happen every 1 to 2 months.
You can also vacuum the outside grill, wipe visible dust from the louvers, and clear leaves and debris from around the outdoor condenser. All good maintenance. None of it touches the stuff that actually matters most.
What's behind the filter
Past the filter sits the evaporator coil. It's a densely-packed grid of aluminium fins that air has to pass through. Over time, dust, pet dander, and mould biofilm coat every fin. And there's no way to reach it without removing the front panel and the barrel fan.
The barrel fan itself, the long cylinder that moves air across the coil, is usually worse. It spins at thousands of RPM for thousands of hours. By year two, it looks like a pipe cleaner that's been through a vacuum bag.
What a deep clean does
A professional deep clean pulls the unit apart, wraps the wall to catch runoff, applies a coil-specific cleaner to break down biofilm, rinses it through with pressurised water, removes and washes the barrel fan, flushes the drain pan and condensate line, applies an antimicrobial treatment, reassembles, and runs a full performance test.
It's work that needs tools, a drop sheet, and about an hour per indoor head. It also needs practice. The panels and clips break easily on older units if you don't know the trick.
Common questions
- Is it safe to spray coil cleaner myself?
- The chemical part is the small problem. The larger issue is that you can't rinse the cleaner properly without removing the fan barrel and wrapping the wall. And DIY cleaner residue attracts more dust than before.
- How much does a deep clean cost?
- Ductless mini-splits start at $199 per head. Ducted and multi-head systems start at $349. HRV/ERV is $129.
- How often should I rinse my filters between pro cleans?
- Every 4 to 8 weeks during the heating and cooling seasons. Quick rinse, full dry, put them back.
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