Ducted Heating 101: Why Cleaning Your Return Air Filter Is Crucial
If your home uses ducted heating, you’re probably familiar with the comfort it provides throughout Melbourne’s cold months. But what you may not realise is that one of the most overlooked components of your system is also one of the most important: the return air filter.
Cleaning your return air filter is a simple yet essential task that can significantly affect your indoor air quality, energy efficiency, and the lifespan of your entire heating system.
What Is a Return Air Filter?
The return air filter is located in the return air grille, which is usually mounted on a wall or ceiling in a central part of your home. Its job is to trap dust, lint, pet hair, and other airborne particles before the air is pulled back into the heater to be warmed again.
By capturing these particles, the filter:
- Keeps your ducted heating system clean
- Prevents dust from circulating through your home
- Protects internal components from clogging or damage
Why It Matters: The Risks of a Dirty Filter
Over time, return air filters become clogged with debris. When this happens, it restricts airflow through the system, forcing your heater to work harder than necessary.
Neglecting to clean or replace your return air filter can lead to:
- Higher energy bills: Blocked filters reduce airflow, meaning your heater has to run longer to reach the desired temperature.
- Reduced heating efficiency: Warm air doesn’t circulate properly, leading to uneven heating or cold spots in the home.
- Increased wear and tear: Your heater’s components work harder under strain, shortening their lifespan.
- Poor indoor air quality: Dust and allergens that aren’t caught by the filter can circulate through your ductwork and into your living spaces.
- Potential breakdowns: Long-term neglect can lead to system faults or complete failure during high-use periods.
How Often Should You Clean Your Return Air Filter?
We recommend checking your return air filter every 3 months during the heating season, and cleaning it if it appears dirty. Homes with pets, allergies, or high dust levels may need more frequent cleaning.
Some return air filters are washable and reusable, while others are disposable and need to be replaced. Check your system’s manual or ask your technician if you’re unsure.
How to Clean a Return Air Filter
For reusable filters:
- Turn off your heater at the main power switch.
- Remove the grille cover and take out the filter.
- Use a vacuum to remove loose dust and debris.
- Wash the filter gently with warm, soapy water.
- Let it dry completely before reinstalling.
For disposable filters:
- Replace with a filter of the same size and rating. Ensure it’s positioned correctly before re-securing the grille.
When to Call a Professional
If you’re unsure how to access or clean the return air filter, or if your system hasn’t been serviced in the past 12–24 months, it’s best to call in a licensed professional. At Pro-Action Plumbing, we offer full ducted heating services that include:
- Filter inspection and cleaning
- Full system safety checks
- Carbon monoxide testing
- General maintenance and performance optimisation
Keep Your Home Safe and Warm This Winter
A clean return air filter may seem like a small detail, but it plays a big role in your home’s comfort and safety. With just a bit of regular maintenance, you can help your heating system run more efficiently, last longer, and provide cleaner air for your family.
Book a ducted heating service with Pro-Action Plumbing today. We service homes across Melbourne’s eastern suburbs including Ringwood, Croydon, Doncaster, and Mitcham — helping families stay warm and safe all winter long.