HVAC School - For Techs, By Techs

De: Bryan Orr
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  • Resumen

  • HVAC School is the ever growing online source for real training topics for technicians in the Air-conditioning, Heating and Ventilation Fields. In the podcast, we will share recorded training, tech ride alongs, share challenging diagnostic scenarios. All to help make the industry, your company, and your truck a better place to be.
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Episodios
  • Delta T Talk w/ JD Kelly

    Delta T Talk w/ JD Kelly
    May 8 2025
    Bryan from HVAC School interviews JD Kelly, known as "student of HVAC" on Instagram, about Delta T measurements in HVAC systems. This episode dives into the fundamentals of Delta T, common misconceptions, and proper measurement techniques. JD explains that Delta T is simply a temperature difference between two points of the same medium, which is often misunderstood in the industry. Many technicians are taught to measure between return grills and supply registers, but this approach can lead to inaccurate readings due to external factors like duct leakage or heat gain from attics. The proper measurement should be taken directly at the equipment to evaluate how the evaporator coil is performing. Humidity plays a significant role in Delta T measurements, which JD discovered when researching the fundamentals. Bryan elaborates on this point, explaining that in high-humidity environments (like Florida), more energy goes toward removing moisture (latent heat) rather than cooling the air (sensible heat), resulting in lower Delta T readings. This is why a newly repaired unit in a humid house might initially show lower readings but improve as the home dries out. The discussion highlights why the common "20-degree Delta T" rule of thumb isn't universally applicable and requires context. Key Topics Covered: Definition of Delta T: Temperature difference between two points of the same mediumDifference between Delta T and TD (temperature difference)Proper probe placement for accurate Delta T readingsImpact of humidity on Delta T measurementsHow regional differences affect expected Delta T valuesRelationship between CFM (airflow) per ton and Delta T readingsCommon mistakes: Adjusting equipment based solely on Delta T readingsChallenges of applying Delta T in heat pump heating modeHow temperature dead spots can affect readingsWhy Delta T readings must be considered alongside other diagnostic testsThe danger of making unnecessary adjustments to HVAC systemsWhy high Delta T isn't always good and low Delta T isn't always bad JD's Delta T tech tip: https://hvacrschool.com/solving-delta-t/ Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    34 m
  • Fire Sprinklers - Short #239

    Fire Sprinklers - Short #239
    May 6 2025

    In this short podcast episode, Bryan talks about fire sprinklers and how to avoid setting them off on job sites.

    Fire sprinklers have an element in the center that expands when exposed to heat (like a TXV sensing bulb) and breaks the glass. When the glass breaks, the fire sprinkler starts pouring out water. In some cases, fire sprinklers are linked to a larger fire suppression system in which several may go off at once, but most of the time, only a single fire sprinkler will go off if bumped or exposed to heat.

    If you're using torches or doing any form of hot work in a closet or other location with a fire sprinkler, make sure to keep torches away from the heat-sensitive bulb or at least cover the sprinkler with a wet rag (and follow your company's guidelines). Blunt force is another possible issue, so we want to avoid hitting the sprinklers with lifts, ladders, or building materials like studs. Keep clearances in mind, and watch out for your colleagues.

    You can get some specialty-built cages to protect the sprinklers, but awareness is one of the best ways to protect fire sprinklers. If possible, make sure signage is posted or that you alert other people in the area about the fire sprinklers.

    If the fire sprinkler does go off, make sure you can quickly reach the person(s) who can access the fire shutoff or direct you to the fire shutoff. While fire sprinklers won't pose much of a personal safety hazard, property damage is a major concern. Training and awareness are the keys to preventing property damage due to fire sprinklers.

    Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

    Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.

    Subscribe to our podcast on your iPhone or Android.

    Subscribe to our YouTube channel.

    Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    8 m
  • The PATH to High Performance HVAC w/ David Richardson

    The PATH to High Performance HVAC w/ David Richardson
    May 1 2025
    In this engaging session, David Richardson breaks down the concept of high-performance HVAC, offering a clear roadmap for industry professionals looking to elevate their craft. Richardson argues that the HVAC industry has long been focused on equipment rather than complete systems, leading to widespread inefficiencies. The average system delivers only about 57% of its rated capacity into buildings, while even code-approved systems barely reach 63%. By implementing high-performance HVAC principles, contractors can achieve up to 88% efficiency while improving safety, health, comfort, and energy performance. Richardson presents a practical framework using the acronym "PATH" - Pressure, Airflow, Temperature, and Heat (BTUs) - as a step-by-step approach to implementing high-performance HVAC. He emphasizes starting with static pressure testing, which he calls "the foundation of airflow" and one of the most misunderstood principles in the industry. Just as doctors check blood pressure as a vital sign during every visit, Richardson advocates for measuring static pressure on every call, or at minimum, when encountering "red flag" issues like repeated equipment failures. From there, professionals can progress to measuring airflow, temperature, and finally BTU delivery to create complete system diagnostics. The presentation offers a journey-based approach, acknowledging that implementation takes time and requires breaking old habits. Richardson introduces the "one degree principle," suggesting that change happens incrementally, with small improvements eventually leading to breakthrough moments. He urges contractors to apply this methodology not just to equipment, but to extend testing into duct systems and even the building envelope. By making these changes visible through measurement, contractors can prove value to themselves, their teams, and ultimately their customers, transforming the way HVAC work is perceived and delivered. Key Topics Covered: The definition of high-performance HVAC: getting back to craftsmanship, challenging the status quo, and confirming work through measurementThe industry problem: focusing on equipment instead of complete systems, resulting in just 57% of rated BTU capacity reaching conditioned spacesThe PATH framework: Pressure, Airflow, Temperature, and Heat as building blocks for system diagnosticsHow to implement static pressure testing as the foundation for airflow diagnosticsThe importance of measuring at both equipment and register/grille locationsBreaking down implementation into three areas: equipment, ducts, and building envelopeSTEPS approach: Show, Teach, Equip, Promote, with application to yourself, your team, and your customersThe "one degree principle" for making incremental changes that lead to breakthrough resultsCommon obstacles to implementation and how to overcome resistance to changeHow measurements make your work transparent and lead to better performance Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    55 m
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Relevant Topics

valuable information for techs by techs right on. Perfect title for Podcast. Looking forward to applying for the scholarship. I'm interested in the apprenticeship and learning the trade.

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Really good!

I've listened to a few other hvac podcasts lately and they are painful. This one is actually really really good.

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amazing HVACR podcast

Bryan Orr is a great instructor. He is very knowledgeable. He has experts from various parts of the industry as guests. He goes above and beyond to give back to the HVACR industry. he has helped me to become a better technician. so grateful for the content he provides.

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Informative & Enjoyable

The podcasters are easy to listen to, not hard on the ears. The HVAC & related material are always informative & applicable. I appreciate these audios.

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Thank you.

I’m new to the trade and love the way you explain it.
Thank you so much.

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Great educational speakers and great industry information.

Great educational speakers and great industry information. Would highly recommend to anyone in HVAC industry. Also has great plugs for great industry tech.

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