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Winter Furnace Maintenance Checklist (For Homeowners in Thunder Bay)
Cold winters in Thunder Bay put serious demand on your furnace. A properly maintained furnace keeps your home warm, safe, and energy-efficient while helping you avoid emergency breakdowns during freezing temperatures.
Use this winter furnace maintenance checklist to prepare your heating system before peak winter weather hits.
Why Winter Furnace Maintenance Is Important
Skipping furnace maintenance can lead to:
Sudden heat loss during cold snaps
Rising heating bills
Reduced system lifespan
Carbon monoxide risks
Most emergency furnace repairs in Thunder Bay happen during winter because small issues were ignored earlier.
Winter Furnace Maintenance Checklist
1. Replace the Furnace Air Filter
How often: Every 1–3 months
A dirty filter restricts airflow and can cause overheating and short-cycling.
Tip:
Replace disposable filters regularly
Clean reusable filters thoroughly and allow them to dry
This is one of the most common causes of furnace inefficiency.
2. Test the Thermostat
Before winter begins:
Switch the thermostat to heating mode
Increase the temperature to confirm the furnace turns on
Watch for delayed ignition or frequent cycling
A programmable or smart thermostat can help reduce heating costs.
3. Inspect the Furnace Flame
If you have a gas furnace, the flame should be steady and blue.
A yellow or flickering flame may indicate incomplete combustion or ventilation problems and should be inspected by a professional immediately.
4. Check Carbon Monoxide Detectors
Carbon monoxide is odorless and dangerous.
Ensure:
CO detectors are installed near bedrooms and the furnace area
Batteries are replaced
Units are tested monthly
This step is critical for winter safety.
5. Clear Vents and Registers
Walk through your home and:
Open all vents
Remove rugs, furniture, or curtains blocking airflow
Check for uneven heating
Cold rooms can indicate airflow or ductwork issues.
6. Inspect the Furnace Exhaust Vent
Your furnace exhaust vent should:
Be clear of snow, ice, or debris
Vent safely outside the home
Blocked exhaust vents can cause shutdowns or dangerous gas buildup.
7. Listen for Unusual Furnace Noises
Contact a professional if you hear:
Loud banging
Rattling
Screeching
Whining
These sounds often indicate mechanical or motor-related issues.
8. Check for Frequent Cycling
If your furnace turns on and off too often, it may be:
Overheating
Experiencing restricted airflow
Improperly sized for your home
Short-cycling increases wear and energy costs.
9. Schedule a Professional Furnace Tune-Up
Annual furnace maintenance typically includes:
Heat exchanger inspection
Gas pressure testing
Electrical safety checks
Efficiency calibration
Many furnace warranties require yearly professional servicing.
When to Call a Furnace Technician in Thunder Bay
Call for service if:
The furnace will not turn on
The furnace blows cold air
Burning smells persist
A carbon monoxide detector alerts
Your home cannot maintain temperature
Prompt service helps prevent complete system failure during extreme cold.
Contact Us:
Phone: +1 (807) 698-8009
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