Your Ultimate Checklist for Seasonal Furnace Inspection

Safety First

Before inspecting or maintaining your furnace, prioritize safety to protect yourself and your home.

Turn Off the Power: Locate the furnace’s power switch or flip the circuit breaker to shut off electricity to the unit. This prevents accidental activation during your work.

Check for Gas Leaks: If you have a gas furnace, inspect the area around the unit for gas smell or any unusual odors. If you detect a gas leak, leave your home immediately and contact a professional or gas company.

Test Carbon Monoxide Detectors: Ensure your carbon monoxide detectors are functioning properly. Replace batteries if necessary and confirm the detectors are positioned near sleeping areas and every level of your home.

Visually Inspect the Furnace

Once safety precautions are in place, perform a thorough visual inspection of your furnace to identify any visible issues that may require attention.

Check for Physical Damage: Look for cracks, rust, or corrosion on the furnace’s exterior and key components. These signs could indicate wear and tear that might affect performance.

Inspect the Area Around the Furnace: Ensure the surrounding area is clean and free of clutter, debris, or flammable materials. This improves airflow and minimizes fire hazards.

Examine the Vents and Registers: Walk through your home and check all vents and registers. Ensure they are clean, open, and unobstructed for proper airflow.

Look for Signs of Leaks: For gas furnaces, check for stains, soot, or other signs of gas or exhaust leaks near the unit or venting system.

Replace or Clean Air Filters

Dirty or clogged filters can restrict airflow, reduce heating performance, and increase energy costs.

Inspect the Filters: Check the air filters for dust buildup or visible dirt. The filters must be cleaned or replaced if they appear dirty or clogged.

Replace Disposable Filters: Most disposable filters should be replaced every 1–3 months, especially during heavy furnace use in winter. Choose filters that match your furnace’s specifications for the best results.

Clean Reusable Filters: If your furnace uses washable filters, remove them and clean them according to the manufacturer’s instructions. Allow the filters to dry completely before reinstalling to prevent moisture-related issues.

Set a Reminder: Check and replace or clean your filters regularly throughout the heating season to maintain consistent airflow and system efficiency.

Check the Furnace Thermostat

A properly functioning thermostat helps maintain your desired temperature and reduces energy waste. 

Test the System: Switch the thermostat to heating mode and increase the temperature above the current room temperature. Wait to hear if the furnace activates. If it doesn’t, the thermostat may need adjustment or repairs.

Inspect Connections: Open the thermostat cover and check for loose wires or visible damage.

Replace Batteries: If your thermostat uses batteries, replace them at the start of the heating season to prevent unexpected malfunctions.

Verify Temperature Accuracy: Compare the thermostat’s reading to an accurate thermometer placed nearby. If there’s a discrepancy, recalibration or replacement may be needed.

Upgrade for Efficiency: Consider upgrading to a programmable or smart thermostat for better control and energy savings during winter.

Inspect the Blower and Fan

The blower and fan of your furnace ensure warm air circulates throughout your home effectively.

Clean the Fan Blades: Remove dirt and debris from the fan blades to maintain proper airflow.

Check the Blower Motor: Look for signs of wear, overheating, or unusual noises when the furnace runs.

Inspect and Replace the Belt (if applicable): Ensure the blower belt is intact and replace it if frayed or worn.

Lubricate Moving Parts: Apply oil to the motor’s designated ports if required to ensure smooth operation.

Clean and Inspect Burners

Ignoring burner maintenance can lead to uneven heating or potential hazards.

Remove Debris and Dirt: Turn off the power and gas supply, then gently clean the burners with a soft brush or vacuum attachment to remove dirt, soot, or debris.

Check Burner Flames: Reignite the furnace and inspect the flames. Blue flames indicate proper combustion, while yellow or orange flames may signal issues like dirt buildup or gas supply problems.

Look for Signs of Damage: Examine the burners for cracks, corrosion, or misalignment. Contact an HVAC technician for repairs or replacement if you notice significant damage.

Check the Heat Exchanger

The heat exchanger helps transfer heat safely and any damage to it can pose serious risks to your home.

Look for Cracks or Corrosion: Visually inspect the heat exchanger for cracks, rust, or corrosion, which could lead to carbon monoxide leaks.

Monitor for Unusual Smells: Pay attention to odd odors when the furnace runs, which could indicate a damaged heat exchanger.

Seek Professional Inspection: Arrange for a professional technician to thoroughly assess the heat exchanger, especially if you suspect any issues.

Inspect and Clean Ductwork

Clean and sealed ductwork ensures efficient airflow and prevents dust and allergens from circulating in your home.

Check for Leaks and Blockages: Inspect the ducts for loose connections, visible leaks, or blockages that could hinder proper airflow.

Clean Dust and Debris: To maintain air quality, use a vacuum or soft brush to remove dust, debris, or pet hair from inside the ducts.

Seal Gaps or Tears: For minor leaks, apply duct tape or sealant to prevent air loss. For significant damage, contact a professional for repair or replacement.

Test the Furnace

Once all maintenance tasks are complete, testing the furnace ensures it operates smoothly and meets your heating needs during the cold months.

Switch to Heating Mode: Turn on the thermostat and set it to heating mode. Gradually increase the temperature to activate the furnace and monitor its performance.

Listen for Unusual Sounds: Pay attention to odd noises, such as rattling or banging, which could indicate internal issues requiring attention.

Monitor Heat Distribution: Walk through your home to check if warm air is evenly distributed across all rooms. Inconsistent heating may point to ductwork or blower issues.

Stay Warm This Winter with Our Professional Furnace Maintenance Service

While tackling furnace maintenance is a great start, a professional inspection ensures your system is fully prepared for the coldest days ahead.

At American Energy Heat & Air, we specialize in uncovering potential issues, fine-tuning your system, and providing solutions that maximize efficiency and reliability. Our emergency HVAC technicians go beyond surface-level checks, addressing critical components like heat exchangers, burners, and ductwork to ensure safe and consistent heating.

Call (916) 229-8659 to book furnace inspection to keep your living space warm and worry-free all winter.