Combustion Analysis

Combustion AnaLYsis for hvac systems

Ensuring that your heating system operates safely and efficiently is critical for both performance and home safety. Combustion analysis is a scientific method used to measure the efficiency and safety of fuel-burning HVAC systems, helping to detect issues that could lead to energy waste, increased costs, or even dangerous exposure to carbon monoxide.

At Gerard Home Inspection, we provide comprehensive combustion analysis services as part of our HVAC inspections, ensuring that your system runs at peak efficiency while protecting your home and family from potential hazards.

What is combustion analysis?

Combustion analysis is a detailed testing process that measures the byproducts of combustion inside a furnace, boiler, or other fuel-burning appliance. By analyzing key factors such as oxygen levels, carbon dioxide (CO₂), and carbon monoxide (CO), we can determine:


  • System Efficiency – How effectively your system is converting fuel into heat.
  • Safety – Whether dangerous gases like CO are being properly vented.
  • Combustion Health – Whether your burners are operating correctly or if adjustments are needed.

A properly calibrated HVAC system reduces energy waste, extends equipment lifespan, and ensures a healthier indoor environment.

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Why combustion analysis is important

While routine maintenance is essential for any heating system, combustion analysis goes beyond standard tune-ups to provide a detailed, data-driven system performance assessment. This test is crucial for both new and older systems, helping to:


  • Prevent Carbon Monoxide (CO) Leaks – Faulty combustion can lead to dangerous CO buildup, which is odorless, colorless, and potentially deadly. A combustion analysis detects unsafe levels before they become a risk.
  • Improve Energy Efficiency – If your system isn’t burning fuel properly, it wastes energy and increases heating costs. A combustion analysis ensures optimal efficiency, saving you money.
  • Ensure Proper Venting – Poor airflow or blockages in the exhaust system can lead to improper combustion, reducing performance and increasing emissions.
  • Identify System Failures Before They Happen – Small imbalances in combustion can signal potential failures. Early detection prevents costly repairs and breakdowns.


Even a minor imbalance in combustion can impact performance, shorten the lifespan of your HVAC unit, and increase your energy bills. Regular combustion analysis ensures long-term reliability and cost savings.

How Does a Combustion Analysis Work?

Our trained HVAC professionals use specialized combustion analyzers to measure:

  • Oxygen (O₂) Levels – Ensures the proper air-to-fuel ratio for clean combustion.
  • Carbon Dioxide (CO₂) Levels – A key indicator of fuel efficiency.
  • Carbon Monoxide (CO) Concentrations – Detects harmful gas leaks.
  • Flue Gas Temperature – Helps determine heat transfer efficiency.
  • Excess Air & Draft Pressure – Ensures proper airflow for complete combustion.

During the test, we insert a probe into the furnace or boiler flue and collect real-time data on combustion gases. These readings help us fine-tune the system, ensuring optimal performance and maximizing safety and efficiency.

Signs You May Need a Combustion Analysis

While combustion analysis is recommended as part of routine HVAC maintenance, certain signs indicate an urgent need for testing:


  • Increased Heating Bills – If your energy costs are rising despite no significant changes in usage, your system may be operating inefficiently.
  • Yellow or Flickering Flames – Gas burners should burn with a steady blue flame. Yellow flames can indicate incomplete combustion.
  • Frequent System Cycling – If your furnace turns on and off more frequently than usual, it may be struggling to maintain proper combustion.
  • Soot Buildup – Soot around the burner or vent indicates poor combustion, leading to energy waste and potential CO risks.
  • Unusual Odors or Headaches – A faint gas smell or persistent headaches when the furnace is running could indicate carbon monoxide leakage.


If you experience any of these symptoms, schedule a combustion analysis immediately to ensure your home’s safety.

Combustion Analysis FAQs

  • What is combustion efficiency, and why does it matter?

    Combustion efficiency refers to how effectively your heating system converts fuel into usable heat. A highly efficient system wastes less energy, reducing utility costs and emissions.

  • How often should I schedule a combustion analysis?

    We recommend annual testing, especially before winter, to ensure peak performance. More frequent checks may be necessary if your system is older or has had repairs.

  • Can combustion analysis prevent HVAC failures?

    Yes! Early detection of combustion imbalances prevents long-term damage to your furnace or boiler, avoiding costly emergency repairs.

  • Is combustion analysis required for all HVAC systems?

    Combustion analysis is essential for any fuel-burning appliance, including furnaces, boilers, and water heaters. Electric HVAC systems do not require combustion testing.

  • Will a combustion analysis improve indoor air quality?

    Absolutely. By optimizing combustion, we reduce harmful emissions, preventing indoor air pollution and CO exposure.

Schedule Your Combustion Analysis Today!

Don’t wait until you notice a problem—a combustion analysis is one of the best ways to ensure safe, efficient, and reliable heating all winter long. Call us today to schedule your HVAC combustion analysis and keep your home warm and worry-free!

 

Gerard Home Inspection proudly serves Northern Kentucky, Cincinnati, OH, and Southeast Indiana. Call us today at (859) 878-7768 in Northern Kentucky or (513) 387-9173 in Cincinnati to schedule an inspection or answer any questions.

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