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Matthew Bruner
Company name: Hearthstone Heating & Air
Position: Owner
Matt Bruner is a Texas-based HVAC technician and small business owner. He has 6 years of experience in the HVAC industry and has operated Hearthstone Heating & Air for a little over a year. He is a regular contributor to HVAC School.
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Tech Tips written:

Make Plenum Pressures Work for You
By:Matthew BrunerThere are several neighborhoods in my area with two—and three-story townhomes with zoning, and I always wonder how long those systems will survive. Zoning can be notoriously hard on HVAC equipment if not set up properly. A single-stage system running full tilt with half the airflow it was designed for because a zone is […]
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5 Takeaways from Manual T
By:Matthew Bruner “Did you do a Manual J?” “Did you run a Manual S on that?” “What does Manual D say?” If you’ve asked any design-related questions on the internet in the last several years, you’re probably familiar with these questions. But how does one “do” a Manual T? I bought Manual T last year […]
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Troubleshooting Water Leaks
By:Matthew BrunerThere is not much worse than having a service call where you can’t figure out where the water is coming from or where it came from before you got there. I have spent many hours scratching my sweaty head in attics while I stared into the riser of a drain line, waiting for water […]
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Event speaker:

The Challenges of Small Business – Roundtable
By:Tersh BlissettLuke PetersonMatthew BrunerAdam MufichJason Julian NOTE: If you cannot view the recording, the video may still be processing. The maximum wait time is 24 hours. We apologize for the delay and appreciate your patience.
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Video guest:

Expansion Valves – What Does and Doesn’t Matter?
By:Bryan OrrMatthew BrunerAdam MufichJoe ShearerCorey CruzMatthew Taylor
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ESCO: All About Education at the ESCO Booth
By:Ty BranamanEugene SilbersteinMatthew Bruner
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Podcast guest:

Learning Outside the Box (Live Rebroadcast)
By:Matthew BrunerAdam MufichCraig MigliaccioTy BranamanBryan Orr  This podcast episode is a live rebroadcast of a livestream with Craig Migliaccio (AC Service Tech) and Ty Branaman (love2hvac). It focuses on different types of learning and how to make the most out of learning experiences. The hosts discuss the differences between random learning, goal-driven learning, and […]
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Women in HVAC (Live Rebroadcast)
By:Matthew BrunerJennifer ManzoShelby BregerSalli CobbJessica Eagan  This podcast brought together several women working in the HVAC industry to discuss their experiences and offer advice. The conversation focused on the positives of working in HVAC as a woman, the importance of community, and the resources available. The women talked extensively about how welcoming and supportive […]
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All About 90% Furnaces
By:Matthew BrunerAdam MufichTy BranamanBryan Orr  Bryan Orr hosted a live podcast discussion all about 90% efficient furnaces with HVAC professionals Ty Branaman, Adam Mufich, and Matthew Bruner. They covered the basics of how 90% furnaces work compared to traditional 80% furnaces, troubleshooting tips, and best practices for installation and service. A key difference with […]
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Posts Commented

The Wide-Narrow-Wide of Manual J
By:Matthew Bruner Starting to work on a Manual J load calculation can feel extremely overwhelming. How do we know what to focus on? What does normal look like? What if I’m way off on something and install way too big or small of a unit? On a practical level, what is the payback or value […]
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Sales: Techniques or Values?
By:Matthew Bruner“The very substance of our existing which has made us leaders in technique, stands as a barrier to any thinking which might be able to comprehend technique from beyond its own dynamism.” -George Grant The odd quote above takes some time to understand but has been rattling around in my brain for weeks now. […]
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What Changes Will You Soon See With the Shift to A2L Refrigerants?
By:Don GillisThis article was written by Don Gillis, the current Technical Training Manager at Chemours. Don was also involved in a popular symposium session about A2L refrigerants with Jason Obrzut and Dr. Chuck Allgood, which you can now watch for free on our YouTube channel HERE. Thanks, Don! We all know that the change to […]
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Plenum Takeoffs Best Practices
By:Matthew BrunerIn my second year in HVAC, I went out with a senior technician to install a supply duct for a bathroom in a house. While he ran the duct, I cut a hole in the plenum and attached the collar. He crawled back across the attic and very nicely told me that people don’t […]
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Residential AC Maintenance Process
By:Matthew BrunerI like processes. I especially like them in the HVAC profession because they give me confidence that I did the job correctly and save me time. When I’m following a process, I spend less time thinking about what I’m doing because my body and mind are trained by repetition. I particularly like processes that […]
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Understanding 240-Volt Circuits
By:Matthew BrunerIt can be useful to think of a multimeter as a “voltage drop” tool. Bryan covers the concept here in an excellent class that I highly recommend. This concept was a big help to me as I began to truly learn how to use a multimeter.  A meter reads the voltage differential between two […]
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Impacts of Decreasing Evaporator Airflow
By:Bryan Orr Airflow, airflow, airflow… When we set up and commission comfort cooling and heating systems, we need to pay more attention to airflow before worrying about the fancy controls or the refrigerant circuit. One way to do that is by checking out Bill Spohn's Airflow 101 webinar on ESCO Group's learning network, which you […]
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Diagnosing a Reversing Valve
By:Matthew BrunerIntroduction Replacing a reversing valve is either every technician’s dream or nightmare. The sheer amount of brazing involved in confined spaces will inspire either delight or nightmares about the upcoming valve replacement. Fortunately, these emotional highs and lows are uncommon because we don’t diagnose and replace bad reversing valves very often.  That itself poses […]
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Furnace Air Temperature Rise
By:Bryan Orr Every gas furnace data plate/tag has a specification for the temperature rise through that furnace. It is shown in a range like 50-80° or 45-75°. Those first two numbers are the lowest recommended temperature rise; the highest allowed temperature rise through the furnace is usually a 30° difference. When possible, we want to get […]
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What is a Micron?
By:Bryan Orr To answer the question in the title, we use it as a measurement of pressure. REALLY, it is a measurement of distance. First, any scale CAN be used to measure vacuum (negative pressure) and positive pressure. The trick is knowing which is best suited for which and the size of the scale. Larger […]
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Refrigerant Oil Basics
By:Bryan Orr First, here's a quick summary of the role of oil in the refrigerant circuit: The compressor requires oil for the lubrication of the moving parts in the compressor. We would keep 100% of the oil in the compressor if we could. However, that is generally unrealistic. So, we need to utilize oils and […]
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Making a Flare – Quick Tips
By:Bryan Orr This article is not a full lesson on making a flare, but it will give you some best practices to make a flare that doesn't leak. First off, we need to clarify that very few unitary manufacturers use flares anymore. You will most often find flares on ductless and VRF/VRV systems and in […]
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Our Best 3D Animated Videos
By:Bryan Orr Over the past year, we have been adding 3D animations to our YouTube channel. It can be difficult to film everything we do in the field, so we've found 3D animations to be a helpful tool to show how parts work and how to do certain tasks. So far, we've uploaded nine 3D […]
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Total External Static Pressure (TESP): A Basic Review
By:Kaleb Saleeby Probably the most popular measurement method for indirect airflow readings is total external static pressure (TESP). A dual-port manometer or two Bluetooth single-port manometers are essential to the HVAC technician toolbag. Here’s a quick review of TESP, why it’s important, and how to make the measurements. TESP is a pressure reading of the […]
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How a Heat Pump Reversing Valve Works
By:Bryan OrrIf you don’t have a gas furnace or fireplace in your home, your unit’s reversing valve is probably your best friend during the winter months.  As their name suggests, reversing valves reverse the refrigerant flow to send the hot, compressed vapor to the indoor coil instead of the outdoor coil. The system releases heat […]
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Piston Design and Bypass
By:Bryan Orr I remember it like it was yesterday. It was my first day of work as a trainee at my first technician job, just a wet-behind-the-ears kid fresh out of trade school. It was a Monday morning, and the technicians and I were standing in the dusty warehouse surrounded by stacks and stacks of […]
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What Should My Superheat Be?
By:Bryan Orr  The most common—and often most frustrating—questions that trainers and senior techs get asked sound something like this: “What should my ______ be?” or “My _____ is at ______. Does that sound right?” Usually, when the conversation is over, both the senior and junior techs walk away feeling frustrated because the junior tech just […]
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Fan Blade Shroud Depth
When a system has abnormally high head pressure (high condensing temperature over ambient) and compression ratio, one of the easiest things to look for is a dirty condenser coil. More often than not, that will be the cause. However… There is another category of issues that can cause high condensing temperature (high head pressure), but these […]
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Checking the Charge on a Heat Pump in the Winter
When you ask many people nowadays how to check the charge on a heat pump during low outdoor temps, they will say that you need to “weigh in and weigh out” the charge. While this may be an effective method, it isn't always practical. Now, if you are making a refrigerant circuit repair, weighing out […]
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HVAC System Design & Load Calculation Course
Duct and system design are two of the BIGGEST needs among technicians, salespeople and contractors. Matt Milton has generously agreed to teach a small online mastermind class on design, load calculation, the math of the trade and much more. While this training may be at “no charge” it certainly isn't FREE. It will require a […]
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How to Determine the Friction Rate for Residential Duct Design
By:Neil Comparetto This article is written by one of the smartest guys I know online, Neil Comparetto. Thanks, Neil! Recently, I posted a question in the HVAC School Group on Facebook that went like this: “When designing a residential duct system, what friction rate do you use?” As of writing this, only one answer was […]
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