When winter fades and warm weather sets in, most of us shift our focus to staying cool rather than keeping warm. However, before you turn off your heater for the season, there are important maintenance steps you should take. Preparing your heating system properly before summer not only extends its lifespan but also ensures it’s ready to work efficiently when the cold weather returns.

Whether you use a ducted gas heater, split system, or reverse cycle heating, taking time to clean, inspect, and service your unit can save you from costly repairs later. Let’s explore how to care for your heater before shutting it down for summer.

Why Seasonal Heater Maintenance Matters

Many homeowners switch off their heaters as soon as the temperature rises, assuming they can deal with any issues next winter. But this approach can backfire. Dust, moisture, and inactivity during the off-season can lead to mechanical problems, inefficiency, and even system failure.

Here’s why seasonal maintenance matters:

• Prevents damage from inactivity: Idle systems accumulate dust and debris, which can clog internal parts.
• Extends system lifespan: Proper care prevents premature wear and tear.
• Improves energy efficiency: Clean and well-maintained systems consume less power.
• Ensures safety: Gas and electrical heaters need safety checks to prevent leaks and hazards.
• Reduces repair costs: Minor issues fixed early can prevent costly repairs later.

A bit of attention now can save you both money and stress when the next winter arrives.

Step-by-Step Guide: How to Take Care of Your Heater Before Summer

Let’s break down how to properly shut down and prepare your heater for the off-season.

1. Turn Off the System Properly

Before starting any maintenance, shut off your heating system completely.

• For ducted gas heating, turn off the main power and gas supply from the switch or valve.
• For split or reverse cycle systems, use the remote or wall control to switch to ‘OFF’ mode, then cut the power from the isolator switch if you’re not using it for cooling.
• For portable heaters, unplug them and store them in a dry place.

Turning off the system prevents unnecessary energy consumption and minimizes wear on internal components.

2. Clean or Replace Air Filters

Your heater’s air filters work hard all winter to trap dust, allergens, and debris. Dirty filters restrict airflow, causing the system to work harder and consume more energy.

Before storing the system for summer:

• Remove and inspect the filters.
• Vacuum or wash reusable filters with warm, soapy water.
• Allow them to dry completely before reinstalling.
• Replace disposable filters with new ones.

Clean filters also improve air quality and prevent musty odors when you restart the heater next season.

3. Inspect and Clean Air Vents and Ducts

Over time, dust, pet hair, and debris build up in vents and ducts, obstructing airflow.

• Remove vent covers and wipe them clean with a damp cloth.
• Check for signs of mould, insects, or debris inside ducts.
• If you notice a musty smell or heavy dust buildup, consider scheduling professional repair and cleaning.

Clean ducts help maintain indoor air quality and ensure the heater runs efficiently next winter.

4. Check the Thermostat

Your thermostat plays a key role in maintaining the desired indoor temperature. Before turning off the heater:

• Check that it’s working correctly and accurately reading the room temperature.
• Replace batteries if needed.
• For programmable thermostats, switch to “cooling” mode if using an air conditioner during summer, or simply turn the unit off.

If you notice irregular temperature readings, have the thermostat calibrated or replaced before winter.

5. Inspect for Gas Leaks or Unusual Odors

For gas heaters, safety is crucial. Over time, fittings and seals can loosen, leading to gas leaks — a serious hazard.

• Turn off the gas supply and listen for hissing sounds.
• If you smell gas, do not switch on electrical devices or light matches.
• Open windows, leave the area, and contact a licensed gas technician immediately.

Scheduling a professional gas safety inspection once a year is highly recommended, even if everything seems fine.

6. Clean the Exterior and Surrounding Area

Dust and clutter can reduce your heater’s efficiency. Before shutting it down:

• Wipe the exterior surfaces of the heater with a soft, damp cloth.
• Vacuum around the unit to remove dirt and dust.
• Keep flammable materials (like papers, curtains, or furniture) away from the system.

A clean heater is less likely to attract pests and remains in better condition during storage.

7. Check for Rust, Corrosion, or Damage

During the colder months, your heating system endures constant temperature fluctuations, which can lead to rust or corrosion.

Inspect metal parts, vents, and outdoor units (for reverse cycle systems) for:

• Rust spots or corrosion
• Loose screws or damaged panels
• Cracked or brittle insulation

If you notice damage, contact a professional technician for repair or replacement. Addressing small issues now can prevent bigger, costlier ones later.

8. Schedule Professional Maintenance

Even with regular cleaning, certain components of your heater need professional attention. A qualified HVAC technician can perform a thorough inspection and servicing, including:

• Checking gas pressure and connections
• Testing carbon monoxide levels
• Lubricating moving parts
• Inspecting burners, igniters, and heat exchangers
• Ensuring electrical connections are safe

It’s best to schedule your service right after winter so that your heater is ready for next season.

9. Seal Off Unused Ducts and Vents (Optional)

If you live in a region with hot summers and won’t use your heater for several months, you may consider sealing off unused ducts.

This helps prevent:

• Dust accumulation inside ducts
• Insects or small pests entering through vents
• Air leakage when using air conditioning

Use magnetic vent covers or dampers to close vents temporarily. Just remember to reopen them before using the heater again.

10. Store Portable Heaters Safely

For portable electric or gas heaters:

• Unplug the unit and coil the cord neatly
• Clean the surface and vents.
• Store in a dry, dust-free area away from moisture.
• Cover it with a cloth or storage bag to prevent dust buildup.

Avoid storing heaters in damp garages or basements where rust or mould could form.

Common Mistakes to Avoid When Turning Off Heaters

Even well-intentioned homeowners sometimes make mistakes when shutting down heating systems. Here are some to avoid:

1. Leaving filters dirty — This leads to mould growth and odours during storage.
2. Skipping gas shut-off — Gas heaters should always have their supply turned off during long breaks.
3. Neglecting outdoor units — Reverse cycle systems often have external components that need cleaning and coverage.
4. Ignoring strange noises or smells — These may indicate issues that need addressing before storage.
5. Skipping professional servicing — Post-season maintenance ensures the heater is ready for next use without surprises.

Special Considerations for Different Heater Types

Ducted Gas Heating Systems

• Turn off gas and power supply.
• Clean return air grilles and filters.
• Inspect ducts for damage or air leaks.
• Have a licensed technician check for gas leaks and carbon monoxide.

Split System Heaters

• Clean both indoor and outdoor units.
• Ensure drain lines are clear.
• Switch to cooling mode if you plan to use it as an air conditioner.
• Schedule a professional tune-up to check refrigerant levels.

Portable and Space Heaters

• Unplug and clean thoroughly.
• Inspect the power cord for damage.
• Store safely in a dry, dust-free location.

Hydronic or Boiler Heating

• Check water levels and pressure.
• Bleed radiators if needed.
• Schedule a yearly service for the boiler.
• Turn off the main switch if not used during summer.

Bonus Tip: Use This Time to Improve Indoor Air Quality

When you’re done with heater maintenance, take this opportunity to improve your home’s air quality.

• Clean air vents and fans to prevent dust recirculation.
• Add indoor plants to naturally purify the air.
• Use an air purifier to reduce airborne pollutants, especially if your home was closed up during winter.

Clean air and proper ventilation make your home healthier and help your HVAC system perform better year-round.

Why Professional Servicing Is Worth It

While some tasks can be handled DIY, a professional heater service ensures your system is safe, efficient, and compliant with regulations. Certified technicians can:

• Detect hidden gas leaks or carbon monoxide risks.
• Identify worn-out parts before they fail.
• Ensure your system meets Australian safety and energy standards.
• Provide documentation for warranty or insurance requirements.

Most experts recommend a full service once every 12 months, ideally after winter and before storage.

Preparing for the Next Season

By caring for your heater before turning it off, you’re already ahead of the game for next winter. Come the first cold night, you’ll simply switch it on without worrying about strange smells, noises, or malfunctions.

A well-maintained heating system offers:

• Faster and smoother startup next season
• Lower energy bills
• Cleaner indoor air
• Peace of mind knowing your home is safe and comfortable

Quick Checklist: Heater Care Before Summer

Here’s a quick recap you can follow before turning your heater off:

☑️ Turn off power and gas supply

☑️ Clean or replace air filters

☑️ Dust and vacuum vents and ducts

☑️ Inspect thermostat and replace batteries

☑️ Check for gas leaks or damage

☑️ Clean the exterior and surrounding area

☑️ Schedule professional servicing

☑️ Store portable heaters safely

☑️ Improve indoor air quality

Final Thoughts

Your heater works tirelessly all winter to keep you warm and comfortable — so give it the care it deserves before letting it rest through summer. Proper shutdown and maintenance will not only protect your investment but also ensure efficient, trouble-free performance when cold weather returns.

Whether it’s a gas, ducted, or reverse cycle system, these maintenance steps are simple yet highly effective. And if you’re unsure about anything, contact a licensed HVAC technician to inspect and service your system professionally.

By maintaining your heater now, you ensure a smooth transition between seasons — saving energy, reducing costs, and extending your system’s lifespan.