Coastal protection

Corrosion Protection for Air Conditioners

Salt air is hard on outdoor units. Our 3-coat rust protection treatment helps keep the panels, circuit board and internal parts of a new outdoor unit protected from salt and water.

Get a free quote Call 1300 101 100

5.0 from 292 Google reviews

Mitsubishi outdoor unit wall-mounted above a garden bed

Corrosion protection

What is air conditioner corrosion protection?

It is an optional treatment for a new outdoor unit. Our team takes the unit apart and applies three coats of HVAC Action rust protection to the panels and the circuit board (PCB) before it is installed. Each coat dries for about two hours. Long term, it helps protect the unit from rust and salt damage.

Outdoor units on the Gold Coast and the Tweed coast live in salt air, rain and strong sun. Over time that can rust the external panels, corrode the fins and pipework of the coil and attack the electronics. Protecting the unit at the start is much cheaper than replacing a corroded board or coil later.

The treatment is available on new split systems and ducted systems. It is especially worth it if you live near the ocean or the unit will be heavily exposed to rain and sun.

Two outdoor units mounted on the wall of a raised home

What we do

How does Frost Solutions protect an air conditioner from corrosion?

In three parts: we inspect for existing corrosion and the conditions that cause it, we treat new outdoor units with three coats of rust protection before installation, and we help prevent rust long term with good installation practice and regular servicing that keeps salt and dirt off the coil.

Corrosion inspection

On a service or replacement we check the panels, coil fins, pipework, brackets and electrical connections for rust and corrosion.

Corrosion treatment

Three coats of HVAC Action rust protection on the panels and PCB of a new outdoor unit, applied before it goes in.

Rust prevention

Regular cleaning of the outdoor coil removes salt deposits before they cause damage, and lets us catch early rust.

Maintenance

If an existing system is dirty as well as weathered, a deeper clean of the coils can bring back some lost performance. See our rejuvenation eco clean. If the coil or board is already badly corroded, we will tell you honestly whether a repair is worth it.

Why it matters

Why is timely corrosion protection important?

Because corrosion is hard to reverse. Once salt has eaten into a coil or a circuit board, the usual fix is a new part or a new unit. Protecting the unit before it is installed, and keeping it clean, prevents damage to components, helps the system keep its efficiency and extends its working life.

Prevents damage to components

Rust on panels lets water in. Corrosion on the coil causes refrigerant leaks, and on the board it causes electrical faults.

Maintains efficiency

Corroded, flaking fins move less heat, so the system runs longer and costs more to keep the house cool.

Extends the life of the system

A protected, clean outdoor unit is less likely to need an expensive coil, board or full replacement early.

Left untreated in a harsh spot, corrosion can lead to breakdowns that are costly or impossible to repair. Protection at the start, plus regular checks, gives you confidence the system will keep running reliably for years.

Solutions

What corrosion protection solutions are there for air conditioners?

The main ones are protective coatings, rust inhibitors and avoiding galvanic corrosion between different metals. Our 3-coat treatment combines a protective coating with rust inhibition on the parts most at risk. Good installation and regular servicing do the rest.

Corrosion-resistant coatings

A coating forms a barrier between the metal and the salt and moisture in the air. Our HVAC Action treatment is applied in three coats to the outdoor unit's panels and its PCB, the parts that suffer most on the coast.

Rust inhibitors

Rust inhibitors slow the chemical reaction that turns steel into rust. Applying protection while the unit is apart lets it reach surfaces that cannot be reached once it is assembled and installed.

Galvanic corrosion

When two different metals touch in the presence of moisture, one can corrode the other, for example a steel bracket against copper or aluminium. Using suitable brackets, fixings and separation during installation reduces the risk.

Ask about corrosion protection when we quote your new system, or call 1300 101 100.

Good questions

Frequently asked questions

Do I need corrosion protection if I live near the beach?

It is worth it. Salt spray carried on onshore winds settles on outdoor units and speeds up rust on the panels and corrosion of the coil and electronics. If your home is close to the ocean or the unit is exposed to rain and sun, ask for the 3-coat treatment when you order a new system.

How long does the treatment take?

A few hours. We take the outdoor unit apart and apply three coats, and each coat needs about two hours to dry. That is why we do it before installation rather than on the day of the install in a rush.

Can you treat an outdoor unit that is already installed?

The 3-coat treatment is done on new units before installation. For an existing unit, book a service: we clean the outdoor coil, check for corrosion and tell you what we recommend.

Does corrosion protection affect my warranty?

No. It is applied by our own technicians as part of the install, and your system keeps our 10-year workmanship guarantee and 5 years parts and labour on the units. Warranty details.

How do I reduce corrosion on my outdoor unit?

Hose the outdoor coil gently with fresh water every few months if you live near the beach, keep plants and mulch clear of the unit, and have it serviced regularly so early corrosion is spotted.

Keep exploring

Rated 5.0 from 292 Google reviews

Every review below is from our Google Business Profile. Read them all on Google.

5.0 from 292 Google reviews checked 13 Nov 2026

★★★★★

I have just had a total of 5 aircons fitted up by the boys at Frost. 4x brand new installs to each bedroom, and a new replacement for the lounge. I cannot fault anything. Their communication, punctuality, price and workmanship have all been superb throughout the entire process. Trouble and stress free. Its easy to see why they have so many 5star reviews. True professionals. Thanks again.

Edwin Google review, about Sep 2026
★★★★★

Absolutely fantastic experience with Frost Solutions! I recently had a ducted air-conditioning system installed and honestly, from the very first conversation through to the finished installation, the whole process was seamless. ... The installation itself was done to a really high standard, the team worked efficiently and left everything clean and tidy. ... Great people, great communication, great workmanship and a great result.

Grant Google review, about Oct 2026
★★★★★

Couldn't recommend Frost Solutions highly enough. We recently had them install a 16kW Daikin ducted system with 8 outlets, 6 independent zones, AirTouch 5, multiple upgrades and a 5 year service plan. ... Another big positive is that Frost Solutions have their own electrical team as part of the installation. ... the entire experience was seamless.

Jordan Google review, about Sep 2026
★★★★★

Frost Solutions installed ducted air conditioning in my home today and I couldn't be happier. The team were professional, friendly, punctual, and down to earth. ... left the house spotless ... I also really appreciated the follow-up call from the office later in the day to check I was completely satisfied ... They're a local business with local staff, and the value was extremely competitive for the quality of service and workmanship provided.

Bradley Google review, about Nov 2025
★★★★★

From my initial phone call to the pre-check and installation, all correspondence and actions were clear and understandable (for someone who is non tech savvy).. Shout out to Paul (Senior Technician) ... He was also clear when showing me how to use the air-con, and info on future servicing and cleaning when needed. Thanks Frost Solutions Team, I highly recommend you to anyone needing a new aircon :)

Sue Google review, about Jun 2026
★★★★★

Wow! Frost Solutions is possibly the best all round company I've worked with for a long time. The admin staff, sales and tradesmen-installers were all very polite, efficient and easy to communicate with. From the time I phoned to organise a quote to the full install was only an about a week ...

Jo Google review, about Nov 2025

Read all 292 reviews on Google More customer reviews

Your comfort, our priority.

Living near the water?

Ask for 3-coat corrosion protection on your new outdoor unit when we quote.