🛠️ Furnace Maintenance Checklist: What Homeowners Can Do & When to Call a Pro
A well-maintained furnace delivers efficient heating, lowers energy bills, and improves air quality. This Furnace Maintenance Checklist shows homeowners which tasks they can handle themselves and when to call a certified technician.
âś… DIY Furnace Maintenance Tasks for Homeowners
1. Replace the Furnace Filter
The furnace filter traps dust, pet dander, and other airborne particles. Manufacturers assign a MERV (Minimum Efficiency Reporting Value) rating to indicate how well the filter blocks particles. Filters with a higher MERV rating capture more but require more frequent replacements—usually every three months.
When filters get dirty, they restrict airflow, overwork the system, and reduce heating efficiency. Replacing filters on time keeps air clean and your furnace running smoothly.
2. Inspect the Thermostat
Turn on your thermostat and check whether the furnace responds properly. If it shuts off quickly, your system may be short-cycling due to poor airflow, often caused by a clogged filter or blocked vents.
Use a portable thermometer to compare actual room temperature with the thermostat’s reading. For smart thermostats, verify Wi-Fi connectivity, install any pending software updates, and review your temperature schedules.
3. Check Air Registers, Dampers & Ductwork
Make sure all air registers and dampers remain open and unobstructed. Look at any visible ductwork for rust, holes, or loose connections that may cause air leaks.
During a professional visit, technicians measure the temperature rise—the difference between return and supply air—to confirm proper airflow throughout your system.
4. Replace the Humidifier Pad
If your home has a central humidifier, inspect the humidifier pad at the start of the heating season. Replace the pad if it appears clogged or calcified. Also, wipe down the humidifier cabinet to remove any mold or mildew.
🧰 Professional Furnace Maintenance Tasks
1. Clean Burners & Flame Sensor
Furnace burners should produce a strong blue flame. If you see a yellow flame, your furnace might have a combustion issue or carbon monoxide risk.
Because many modern furnaces have sealed burner compartments, let a certified technician clean them. Technicians also remove and clean the flame sensor during this process to ensure proper function.
âś… Tip: Homeowners in Ontario can sign up for a Furnace Protection Plan that covers key parts like flame sensors, blower motors, and circuit boards.
2. Inspect the Heat Exchanger
Cracks or corrosion in the heat exchanger can lead to dangerous carbon monoxide leaks. If the heat exchanger fails, you’ll need to replace the entire furnace.
Only HVAC professionals should inspect the heat exchanger to ensure the system runs safely.
đź“ž When to Call a Professional
You can handle basic tasks from this Furnace Maintenance Checklist, like filter changes and thermostat checks. However, cleaning burners or inspecting the heat exchanger requires professional tools and experience. Schedule annual service with a licensed technician to keep your furnace safe, efficient, and long-lasting.
