Understanding Your Furnace – Frequently Asked Questions

Ensuring the optimal performance of your furnace is essential for a comfortable and well-heated home. However, like any household appliance, furnaces can encounter common issues that affect their efficiency and functionality.

Addressing these problems promptly can prevent larger and more costly repairs while ensuring your heating system operates at its best. At Nebo Comfort, a trusted HVAC service provider, we can help identify common furnace issues and practical solutions to keep your home warm and cozy.

Commonly Asked Furnace Questions

Commonly asked questions about furnaces typically revolve around various aspects of their operation, maintenance, efficiency, and troubleshooting.

Here are some frequently asked questions:

  1. How does a furnace work?

    • People often want to understand the basic principles of how furnaces generate heat and distribute it throughout a home.
  2. What are the different types of furnaces?

    • Homeowners may inquire about the various types of furnaces, such as gas, electric, oil, or even newer energy-efficient models.
  3. How often should I replace my furnace filter?

    • Maintaining the furnace filter is crucial for efficient operation. Users frequently ask about the recommended frequency of filter replacement.
  4. What size furnace do I need for my home?

    • Determining the right size of the furnace is critical for optimal performance. Questions about calculating heating requirements for specific home sizes are common.
  5. How can I improve the efficiency of my furnace?

    • Homeowners often seek advice on optimizing furnace efficiency, including tips on insulation, programmable thermostats, and regular maintenance.
  6. What is the average lifespan of a furnace?

    • Understanding the expected lifespan of a furnace helps homeowners plan for replacements and budgeting.
  7. Why is my furnace making strange noises?

    • Unusual sounds coming from a furnace can be a sign of underlying issues. Users inquire about the possible causes and solutions for different noises.
  8. How can I troubleshoot a furnace that’s not heating properly?

    • When a furnace fails to provide adequate heat, users seek guidance on troubleshooting steps before calling for professional help.
  9. What is the importance of furnace maintenance?

    • Users often want to know why regular maintenance is essential for the longevity and efficiency of their furnace.
  10. How do I light the pilot light on my furnace?

    • For gas furnaces with a pilot light, users may need guidance on relighting the pilot light, especially after it goes out.
  11. What is the cost of furnace installation?

    • Homeowners frequently inquire about the average cost of installing a new furnace, including factors that may affect the overall expense.
  12. Is it possible to convert my furnace from oil to gas (or vice versa)?

    • Some homeowners may consider changing the fuel source for their furnace and inquire about the feasibility and process of conversion.
  13. Are there government incentives for upgrading to an energy-efficient furnace?

    • Users often want to know about available rebates or incentives for installing energy-efficient furnaces to help offset costs.

These questions cover a range of topics related to furnaces, addressing both basic operation and more specific issues related to maintenance and troubleshooting.

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Common Furnace Issues and their Solutions

The solutions to furnace issues depend on the specific problem you’re facing.

Here are some common furnace problems and their corresponding solutions:

  1. Dirty or Clogged Filters:

    • Solution: Replace or clean the air filter regularly, following the manufacturer’s recommendations. This helps maintain proper airflow and improves efficiency.
  2. Thermostat Malfunctions:

    • Solution: Check the thermostat settings, replace the batteries if necessary, and ensure it’s properly calibrated. If problems persist, consider replacing the thermostat.
  3. Lack of Heat:

    • Solution: Check for issues with the pilot light (if applicable), ensure the gas supply is sufficient, and inspect the heating element. If in doubt, consult a professional HVAC technician for diagnosis and repair.
  4. Strange Noises:

    • Solution: Identify the source of the noise. It could be a loose or damaged component. Tighten loose parts, lubricate moving components, and schedule professional maintenance if needed.
  5. Frequent Cycling:

    • Solution: Address issues with the thermostat, check for dirty or clogged filters, and ensure proper sizing of the furnace. If problems persist, seek professional assistance.
  6. Blower Motor Issues:

    • Solution: Lubricate the motor if applicable, check for loose or damaged belts, and inspect the motor for signs of wear. Replace the motor or belts if necessary.
  7. Gas or Fuel Supply Issues:

    • Solution: Check for gas leaks, ensure the gas valve is open, and inspect the fuel supply. If there are issues, contact your utility provider or a qualified technician.
  8. Airflow Problems:

    • Solution: Inspect and clear any obstructions in ducts, vents, or registers. Ensure that the supply and return vents are open and unblocked.
  9. Clogged Condensate Drain:

    • Solution: Clean the condensate drain line regularly to prevent clogs. If clogging persists, consult a professional to clear the drain.
  10. Pilot Light or Ignition Problems:

    • Solution: Relight the pilot light if it has gone out. For electronic ignition systems, check for faulty components and replace as needed.
  11. Carbon Monoxide Leaks:

    • Solution: Install a carbon monoxide detector near the furnace. If the detector sounds an alarm, evacuate the premises and contact emergency services.
  12. Faulty Limit Switch:

    • Solution: If the limit switch is faulty, it may need replacement. Consult a professional HVAC technician to diagnose and address the issue.
  13. Regular Maintenance:

    • Solution: Schedule annual maintenance with a qualified technician. Regular inspections, cleaning, and adjustments can prevent many common furnace problems.
  14. Wear and Tear:

    • Solution: Components showing signs of wear, such as belts, bearings, or the heat exchanger, may need replacement. Regular maintenance can help identify and address these issues before they lead to a breakdown.

For any furnace issues beyond your expertise, contact Nebo Comfort.

Attempting complex repairs without proper knowledge can be dangerous and may void warranties.

Regular professional maintenance can also help prevent many common furnace problems.


In this article, we’ve discussed various furnace problems and their corresponding solutions. From addressing issues with airflow, thermostat malfunctions, to tackling more complex problems like a faulty limit switch, timely attention and proper maintenance are key.

Nebo Comfort’s team of HVAC professionals stands ready to assist you in diagnosing and resolving any furnace-related issues, ensuring your home stays comfortably heated throughout the seasons.

Regular maintenance not only prevents breakdowns but also enhances the efficiency and longevity of your furnace. Stay warm and worry-free with Nebo Comfort’s reliable HVAC services.