HVAC Maintenance Checklist for Changing Seasons
Are you ready to switch over from cooling to heating? Not so fast, mate. A brutal Aussie summer thrashes air conditioning units, and skipping your autumn maintenance is a guaranteed way to ensure your heating fails right when a cold snap hits.
Now is the exact time to run through a proper HVAC maintenance checklist to keep your customers comfortable and their systems bulletproof. Ignoring these routine checks usually results in emergency breakdowns, angry clients, and expensive repair bills.
Read on to find out exactly what needs addressing across both cooling and heating systems, and how the right HVAC supplies can make the changeover a breeze.
Air Conditioning: Post-Summer Recovery
You’re probably asking why you need to service the AC now when you won’t be needing it for the next few months. Here’s the reality: leaving a system sitting idle with dirty coils and blocked drains over winter is asking for corrosion and mould. After a scorching summer, right now is the best time to clean, protect, and lock down the air conditioner.
Clean Drain Lines and Pans
Leaving standing water in a drain pan over winter is a rookie mistake. Standing water breeds mould, mildew, and invites rodents. Flush the drain pipes and clear any obstructions so that when the system is fired up again next spring, it doesn't instantly overflow and cause water damage to the ceiling.
Clean the Coils
Summer dust and grime baked onto AC coils completely chokes system efficiency and accelerates metal corrosion. Leaving that debris sitting there over winter can result in pitted copper and nasty refrigerant leaks.
Check Refrigerant Charge
While we're on the subject of leaks, check the system's static pressure. If the charge is low, there’s a leak. Don't leave a system sitting flat over winter—find the leak, braze it, pressure test it, and recharge it now so it’s ready for the first hot day of spring.
Inspect Ducts
Moisture can build up in ductwork, particularly after a wet and humid summer. This turns the ducts into a breeding ground for biological pollutants. Check the airflow and duct condition with quality testing gear to ensure the building's occupants aren't breathing in nasty spores all winter.
Heating: Pre-Winter Prep
If you manage commercial contracts, you are responsible for the comfort and safety of the building's occupants. This heating maintenance checklist ensures you've ticked every box before the system is forced to work overtime.
Change Filters
If the AC and heating systems share the same return air filters, they are already clogged with summer dust. Running the heater with a blocked filter chokes the blower motor and introduces impurities. Swap them out now, and set up a monthly or quarterly replacement schedule depending on the site.
Check Belts and Pulleys
Rubber belts that have been sitting idle or baking in summer heat can become brittle. A cracked belt will snap the second the blower motor kicks into high gear. Inspect them, check the tension, and replace any that look worse for wear so the heater doesn't fail on a freezing July morning. It's also worth monitoring machinery with surface temperature strips on motor housings and bearing points—these give you an instant read on heat stress that isn't visible during a standard inspection.
Inspect Electrical Parts
A single fried wire, loose terminal, or failing capacitor can bring an entire heating plant to a grinding halt. Grab your multimeter and confirm the electrical components and connections are tight, safe, and drawing the correct current.
Check Limit Switch Operation
The limit switch is a critical safety component. If the heating element gets dangerously hot, the limit switch shuts off the burner. Test this switch before winter begins—if the blower is running continuously but the air is cold, this part is likely stuck open and needs replacing immediately.
Inspect Duct Insulation
Over time, possums, rats, and general wear and tear will destroy duct insulation in the roof cavity. When this happens, the expensive heated air bleeds out into the roof before it ever reaches the vents. The system runs longer, the power bill spikes, and the equipment wears out faster. Patch and tape the insulation now.
Tradie Tip: Don't try and blast fragile indoor coils with a standard high-pressure cleaner. You'll flatten the fins instantly. Use a dedicated low-PSI portable washer like a Hydrocell to clear the muck without damaging the soft aluminium.
Stock Up on Quality HVAC Supplies
The changing seasons take a massive toll on HVAC systems. You need reliable, professional-grade tools to maintain these units and keep your call-backs to an absolute minimum.
Find the biggest brands in Australia right here at HVAC Shop. We've partnered with heavyweights like Fieldpiece, Robinair, Mastercool, Yellow Jacket, and JAVAC to ensure you have exactly what you need in the back of the van when the season shifts.
Frequently Asked Questions (FAQ)
Why is seasonal HVAC maintenance important in Australia?
Australia’s extreme climate swings force HVAC systems to work incredibly hard. Preventative maintenance clears out the wear-and-tear from the previous season (like summer dust on AC coils) and prepares the system for the upcoming season, drastically reducing the chance of a catastrophic breakdown when you need the unit most.
How often should I change my HVAC filters?
As a general rule, standard return air filters should be checked monthly and replaced at least every 3 months. In high-traffic commercial buildings, or homes with pets and heavy dust, they may require monthly replacement to prevent the blower motor from suffocating.
What happens if I ignore standing water in the AC drain pan over winter?
Leaving stagnant water in the drain pan allows thick mould, mildew, and algae to grow over the winter months. This can permanently block the drain pipe, meaning the very first time you use the AC in spring, it will overflow and cause severe water damage to the ceiling.
Why check the heating limit switch before winter?
The limit switch is a vital safety mechanism that shuts off the burner if the internal heating elements get too hot. If this switch is faulty or stuck, the system poses a major fire risk or will constantly trip out, leaving the building freezing cold.