How Often Should a Furnace Be Serviced?

Most furnaces should undergo maintenance by a professional technician at least once a year, ideally in the fall, before the winter season begins. Annual furnace maintenance gives professional technicians the opportunity to inspect key internal components, test safety controls, and identify any potential issues that could develop into major problems down the road.

Regular maintenance helps keep your furnace operating correctly, efficiently, and reliably throughout the heating season. Note that maintenance can't prevent every repair and it doesn't guarantee lower energy bills. It does, however, help HVAC technicians identify any potential issues before the become larger problems. It also gives them a chance to inspect safety components and confirm that your heating system is working the way that it should.

More Reliable Winter Heating

Your furnace likely runs for extended periods of time during the winter, especially in southern Ontario where temperatures can plummet well-below freezing for a good chunk of the year. With annual maintenance, technicians can address any concerns and improve your systems performance levels, which will help reduce the likelihood of unexpected breakdowns during the time when you rely on your furnace the most.

Safety Checks

Professional maintenance appointments also include safety inspections that should only be attempted by certified technicians. These checks often include the heat exchanger, burners, venting systems, combustion air supply, electrical systems, and other safety controls and are intended to confirm whether there are any signs of wear or abnormal operation. By repairing any red flags in these systems, annual service appointments help keep your furnace working safely.

Better System Performance

Dust, dirt, and other debris can impact how well your furnace operates. During your appointment, technicians will clean internal components, change dirty air filters, and verify thermostat settings to ensure you're able to maintain a consistent comfortable indoor temperature throughout the winter months.

Fewer Unexpected Breakdowns

Routine maintenance also helps identify developing issues before they lead to unexpected breakdowns. Technicians will inspect burners, flame sensors, blower motors, condensate drains, and electrical components that may show signs of wear, and repair them accordingly.

Longer Equipment Life

Each winter season puts stress on your furnace components. Neglecting maintenance can contribute to this wear and tear over time. Keeping your furnace clean, ensuring proper airflow, and addressing repairs quickly can help extend the service life of your appliance, which helps prevent premature replacements.

Warranty Documentation

Many furnace manufacturers require routine maintenance as part of their warranty clauses. Failing to keep your furnace maintenance up-to-date may void your warranty coverage. Maintaining documents of all appointments can be helpful if any warranty questions arise in the future.

Ideally, the best time to have your furnace service appointment scheduled is in the early fall, before the heating season begins.

If Fall Has Already Passed

If you missed scheduling your appointment in the fall, don't wait until next year. Your furnace system can still undergo maintenance in the winter months.

A professional maintenance appointment will include the following:

• Review the Thermostat and System Operation: Confirmation that thermostat communicates correctly with the furnace system.

• Inspect the Heat Exchanger: Inspection of heat exchanger for any visible signs of corrosion, soot, overheating, or other damages that can affect heating cycle.

• Inspect Burners and Ignition: Burners, ignition parts, flame sensors, and combustion performance should be checked to ensure furnace starts and operates correctly and safely.

• Inspect Venting and Combustion Air: Review of venting components to identify possible loose connections, drainage concerns, and obstructions.

• Test Safety Controls: Technician may also test pressure switches, limit controls, flame sensors, and other safety devices.

• Check Electrical Components: All wiring electrical connections, blower motors, capacitors, relays, and control boards will be inspected for wear and tear, corrosion, and overheating.

• Check the Blower and Airflow: Blower assembly furnace filter, and supply/return vents are inspected for any blockages that could impact airflow and heat distribution.

• Inspect the Condensate System: Condensate drain line and hoses are inspected for leaks and blocks (high-efficiency furnaces).

• Clean and Adjust Components Where Required: Cleaning and adjustments will be conducted on parts.

• Document Findings: Technicians will provide a written summary of work completed, along with the date of service.

These terms are often used interchangeably, but they describe different types of services.

Furnace Inspection

An inspection focuses on analyzing the furnace's overall operation, safety, and condition.

Furnace Tune-Up

A tune-up generally includes an inspection, testing, cleaning, and adjustment of components.

Furnace Maintenance

Maintenance is an ongoing process that keeps your furnace in good condition.

Furnace Repair

Repairs address malfunctioning or broken components.

Furnace Cleaning

Cleaning is a part of maintenance to remove any dust, dirt, and other debris buildup from internal components.

Commons signs that could indicate your furnace may require servicing before your annual maintenance appointment include:

• Loud unusual noises

• Strange smells

• Higher than normal utility costs

• Your system is short-cycling

• There is restricted air flow from your vents

• Uneven heating throughout your interior

• Incorrect thermostat readings

• Displays recurring error codes

• Carbon monoxide alarm sounds

Professional maintenance should not replace routine homeowner upkeep. Between appointments, homeowner should:

• Inspect or replacing filters every couple of months according to manufacturers recommendations.

• Keep supply and return vents clear of any furniture, rugs, curtains, or toher items that may impact airflow.

• Keep the furnace area clean and clear of any combustible or flammable materials.

• Check exterior vent openings to confirm vents aren't blocked by snow, ice, leaves, and other debris.

• Monitor furnace operation for any unusual noises, smells, error codes, water leaks, or changes in heating performance levels.

• Test carbon monoxide alarms to ensure any potential carbon monoxide leaks are accurately detected.

Choosing a reputable and licensed contractor to perform your furnace maintenance is essential to ensuring your equipment is in good hands. Before signing any contract, ask technicians the following:

• Is the business licensed or registered as required in the province?

• Is the technician certified for the fuel and equipment type?

• Is the company insured?

• What does the tune-up include?

• Will the heat exchanger and venting be inspected?

• Are combustion or gas-pressure tests performed when required?

• Is the condensate system checked on high-efficiency furnaces?

• Will the technician provide written findings?

• Are repairs quoted separately?

• Will maintenance documentation be provided for warranty records?

• Does the contractor service the furnace brand and model?

• Is the service price disclosed before the appointment?

To prepare for your upcoming service appointment, here's what you should do before a technician arrives at your home:

• Create a safe path to your furnace.

• Remove items from around your heating system.

• Write down unusual sounds, smells, or performance concerns you may have.

• Take note of any recent error codes.

• Record when the filter was last replaced.

• Locate your furnace manual if available.

• Gather installation and warranty records.

• Make a list of recent repairs.

• Ensure your thermostat is easily accessible.

• Identify rooms with uneven heating (if applicable).

• Keep pets and small children away from the work area.

Questions to Ask After the Service

Once your service appointment is complete, ask your technician the following questions:

• Was the furnace operating safely?

• Was the heat exchanger inspected?

• Were any signs of corrosion, overheating, or leakage found?

• Were the burners and ignition operating correctly?

• Was the venting system inspected?

• Was the condensate system checked?

• Does the filter need replacement?

• Were any repairs recommended?

• Which repairs are urgent?

• When should the next service occur?

• What maintenance records should be kept?