HVAC School - For Techs, By Techs
752 episodes - English - Latest episode: 4 days ago - ★★★★★ - 943 ratingsReal training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.
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Episodes
Matter, Mass, Weight, and Volume
September 11, 2017 10:00 - 24 minutes - 34 MBThis episode covers some basics of matter that relate to HVAC/R. These basics include mass, weight, and volume. There will also be some talk of specific gravity and specific volume. Matter and energy are the building blocks of the HVAC industry; we move matter around and transfer energy. Matter refers to anything that exists and takes up space, including all solids, liquids, and gases. We use three means of measuring matter: volume, mass, and weight. Volume refers to how much space an ob...
Ductless and VRF Diagnosis w/ John Chavez EP1
September 09, 2017 20:26 - 1 hour - 98.3 MBWhat do you need to know to walk up and fix a VRF or ductless system? John Chavez, a longtime VRF/ductless pro, explains his approach in Part 1 of this podcast. You CANNOT have a haphazard approach to installation or service. The best thing you can do is respect VRF and ductless technology for what they are. When you take the time to understand the equipment and the processes at work, you will be successful. The best thing you can bring to a job is patience. Unlike on typical split syste...
Bonus - Tech Communication and "PM Specials" w/ Frank Besednjak
September 07, 2017 19:25 - 59 minutes - 81.9 MBFrank Besednjak talks about proper communication in conflicts between techs and managers. He also covers the potential problem with inexpensive air conditioning maintenance specials. When it comes to communication, Frank is a proponent of honesty and straightforwardness. However, he understands and appreciates the fact that people have different communication styles. He encourages people to write down their ideas, whether those ideas benefit the company, themselves, customers, etc. Frank e...
The Basic Refrigeration Circuit, Pressure & Enthalpy w/ Carter Stanfield
September 04, 2017 20:31 - 54 minutes - 74.8 MBCarter Stanfield, a co-author of Fundamentals of HVACR, talks about the entire refrigeration circuit. He also explains how to read and plot a pressure-enthalpy diagram. The refrigeration circuit has four main components: evaporator, compressor, condenser, and metering device. When teaching, Carter likes to explain that boiling is a cooling process and condensation is a heating process. He describes saturation as the breaking point at which liquid refrigerant can no longer hold more heat (...
Bonus - Leak Sealants and How They Work w/ James Bowman
September 01, 2017 18:39 - 40 minutes - 56.5 MBJames Bowman talks to Bryan about leak sealant products, including RectorSeal's Leak Freeze product. James talks about how sealants work, what happens when they don't work, and how to be open-minded without being gullible. Leak sealants must not react adversely with the components inside a system (oil and refrigerant). Just as mineral oil caused some issues with O-rings, POE oil has additives that cause acid to form on the system. RectorSeal's Leak Freeze is technically an oil that can wor...
Commercial Refrigeration for A/C Techs w/ Dick Wirz
August 28, 2017 20:47 - 1 hour - 98.7 MBDick Wirz, author of Commercial Refrigeration for Air Conditioning Technicians, talks about making the switch from A/C to refrigeration. Dick Wirz is an advocate for using rules of thumb, which is a controversial position. However, rules of thumb are an excellent way for A/C techs to dip their toes into the refrigeration world. Rules of thumb are less likely to overwhelm technicians than the exact technicalities of certain readings and measurements. Some prime examples of using rules of ...
Introduction to Ammonia Chillers w/ Camron Conlee
August 23, 2017 10:00 - 41 minutes - 56.9 MBCamron Conlee joins the podcast to give us an introduction to ammonia chillers. He also explains what it's like to work with a poisonous refrigerant. The California division of TDI Refrigeration, where Camron works, primarily works on ammonia systems. We often see ammonia refrigeration in cold storage and food processing; ammonia refrigeration is usually in industrial applications away from the public. Ammonia is more hazardous than CO2 and other refrigerants because it is toxic. When work...
Scales - The Episode You've been Weighting For w/ Adolfo Wurts
August 22, 2017 10:00 - 44 minutes - 61.1 MBAdolfo Wurts from Arbiter Incorporated, designer of the UEI WRS line of Bluetooth scales, comes on the podcast. We talk all about scales and how to use them. You'll want to pull a scale off your truck every time you add refrigerant to a system. Many technicians choose to estimate how much refrigerant they have to put in, and they sometimes put in more refrigerant than they estimated in their quote. Consequently, the business loses money. You'll also want to weigh your tanks during EVERY re...
Big Announcement - 8/21/17
August 21, 2017 13:57 - 5 minutes - 7.66 MBIn this quick announcement I talk about the launch of the revolutionary diagnostic and data management tool MeasureQuick
Looking past the First Thing & Facial (Hair) Profiling w/ Todd Liles
August 18, 2017 14:59 - 1 hour - 92.6 MBTodd Liles of Service Excellence Training joins the podcast. He talks about techs who shouldn't be on commission, how to make the most of your career, and facial hair profiling. Todd's skillset was mixed; he had some technical knowledge, sales experience, and communication skills. He took those skills into training, and he started his own business based on his skills; his first business didn't pan out, but he founded Service Excellence Training and has grown quite a bit. Todd develops tech...
Advanced Evacuation w/ Jim Bergmann
August 16, 2017 22:25 - 1 hour - 98.1 MBJim Bergmann returns to the HVAC School podcast to cover some advanced topics in evacuation, including rig setups and triple evacuation. To increase the speed of evacuation, you need two large-diameter vacuum hoses to overcome the limitations of pressure. Core removal is also critical, as Schrader cores are a significant restriction. It's also unwise to use a manifold for evacuation; a manifold will double your hose length, provide a restriction, and serve as a leak point. The vacuum pum...
Using Zoomlock Every Day w/ Brent Ridley
August 10, 2017 20:53 - 26 minutes - 37.3 MBIn this episode Brent Ridley talks about the flame free Zoomlock fittings and tool from Parker and why he is using it for almost everything to replace brazing.
Using ZoomLock Every Day w/ Brent Ridley
August 10, 2017 20:53 - 26 minutes - 37.3 MBIn this episode, Brent Ridley talks about the flame-free ZoomLock fittings and why he is using them for almost everything to replace brazing. These are tools from Parker, and they can give you leak-free fittings within seconds. ZoomLock works in residential and commercial applications. The fittings come in a wide range of sizes for the large piping of VRF systems and the smaller copper tubing of residential A/C suction lines. Brent measures the tubing to make sure there's enough room. Then...
How to Perform a Leak Detection on a Low Pressure Chiller w/ Jeff Neiman
August 09, 2017 21:20 - 45 minutes - 63.4 MBJeff Neiman returns to the HVAC School podcast to explain how we can perform leak detection on a low-pressure chiller. Jeff works on systems with glycol loops or other forms of secondary fluids, which may have leaks from time to time. When the chilled water pump on the suction side runs into a vacuum, air can get into the system via the shaft seal. Then, more leaks can occur in the glycol loop as more air goes into the system. High-pressure chiller leak detection is pretty much the same as...
Special Episode - The Launch of an HVAC Industry Changing App w/ Jim Bergmann
August 04, 2017 19:36 - 38 minutes - 53.1 MBIn this episode of the podcast, Jim Bergmann talks about the launch date of the measureQuick (MQ) app, what it will do, why he made it, who it is for, and why it's different than anything else that came before. MeasureQuick is a universal measurement platform that incorporates Bluetooth to display, store, and interpret measurements. The initial release focuses heavily on air conditioning, but its goal is to assist with combustion analysis and refrigeration readings. It is a troubleshooting...
Condensate Switch Codes and Practices w/ James Bowman
August 02, 2017 19:59 - 40 minutes - 55.8 MBJames Bowman of Rectorseal returns to the podcast to discuss condensate switch codes and some best practices to comply with the codes. The humble condensate switch actually has installation standards; although there isn't a "law" about the codes, many areas follow and enforce the contents of the International Mechanical Code (IMC). Some states, including Florida, also adopt elements of the IMC and amend it to create a set of guidelines for the state. The IMC has widely-enforced code 307....
Bonus - Being On Call w/ Les Fork
July 31, 2017 19:43 - 53 minutes - 73.3 MBLes Fork returns to the podcast to discuss on-call rotations. He explains why being on call is necessary and how you can make the most of it. We are supposed to be on call for the sake of customer service; when a customer has an emergency, it's best for the customer (and the business) when someone is available to respond to the emergency. Of course, many of us dread being on call (although the paycheck might be quite nice). You may only have one or a few techs on call, so it can be diffi...
Measuring Air Flow - Air Density and Direct Air Flow Measurement Part 2 w/ Jim Bergmann
July 24, 2017 20:32 - 47 minutes - 65.8 MBIn this podcast episode, Jim Bergmann continues talking about standard air, air density, and mass vs. volume as well as some other methods of "directly" measuring airflow. It gets pretty deep. Airflow hoods and vane anemometers can give you direct airflow measurements. You use static pressure probes, not pitot tubes, to measure TESP. When measuring static pressure, you put the negative probe in the return and the positive probe in the supply. Then, you measure the TESP (away from wiring ...
Bonus - Impressions From a Week as a Tech from a College Intern w/ Bill Spohn Jr.
July 24, 2017 19:28 - 24 minutes - 33.4 MBBill Spohn Jr. is a college intern working towards his business degree, but he took a week to see what it is like to work as an HVAC tech. He shares his impressions on this podcast. Bill is the son of Bill Spohn and has been a college intern working with TruTech Tools. However, he has just gotten his first real dose of the HVAC contractor experience in the full swing of summer. Bill started off by riding with a Kalos residential tech, Tyler, who had seven calls that day, mostly for PMs; th...
Measuring Air Flow - Static / Capacity & ECM Motors Part 1 w/ Jim Bergmann
July 19, 2017 19:54 - 1 hour - 89.8 MBIn this two-part podcast series, Jim Bergmann talks about measuring airflow in HVAC systems. He covers a wide range of airflow measurement instrumentation and readings. In this first episode, Jim covers ECM motor considerations, delivered capacity, laminar flow, and more. In the HVAC industry, many techs confuse static pressure for airflow. Although you need static pressure to have airflow, it is NOT airflow and can fluctuate rather wildly depending on the duct conditions. Static press...
Brazing Basics and Tips
July 12, 2017 22:07 - 47 minutes - 64.9 MBIn this podcast episode, Bryan talks about brazing basics and tips. He goes over safety, regulator settings, torch positioning, flowing nitrogen, heat control, and more. Whenever you're going to be working with equipment that creates fire, you will want to make sure you know all of the safety procedures and have appropriate PPE. Make sure your gear is in really good condition; make sure your hoses and regulator have not been damaged. Be sure to have a fire extinguisher handy as well. When ...
Bonus - Blue Collar Life & Experience w/ Ralph Wolf
July 10, 2017 19:05 - 1 hour - 98.4 MBBryan talks to Ralph Wolf from T&N Services on YouTube and the Working Joe's podcast. We talk about blue-collar life, how the trade has changed for us, and what experience gives a tech that can't be read in a book. Ralph started off doing sheet metal work in the Navy before going into HVAC. He started as a sheet metal installer and learned most of what he knows about HVAC on the job. Taking accurate superheat and subcooling readings have become much more important over the years. We can't ...
Drying Stuff vs. Drying Air - Humidification, Dehumidification and Ventilation
July 03, 2017 20:20 - 45 minutes - 62.5 MBThis episode is a rebroadcast of a very useful episode from the Corbett Lunsford's Building Performance Podcast at https://buildingperformancepodcast.com/. Corbett talks to building moisture control expert Lew Herriman about moisture, ventilation, and what happens when you're drying "stuff." When we think about humidity control, we have to ask if we're drying air or drying "stuff." Dehumidification is about drying the air, but many people think about it when they actually want to dry "stuf...
Bonus - Restaurant Equipment "Hot Side" w/ Nick Messick
June 30, 2017 20:57 - 44 minutes - 61.7 MBRestaurant HVAC and refrigeration tech Nick Messick comes on the podcast to talk about restaurant equipment, especially the "hot side." The "hot side" refers to equipment that heats the food; it includes often deep fryers but has a lot of variation. The "hot side" also includes specialty equipment for frying noodles and performing other unique functions. In Nick's opinion, the worst service call has to do with fryer pumps due to all of the grease. The grease gets all over tools and your ha...
Building Automation Basics for the HVAC Tech w/ Phil Zito
June 28, 2017 15:41 - 50 minutes - 70 MBPhil Zito of Building Automation Monthly comes on the podcast to discuss building automation and what HVAC techs should know about it. Automation essentially refers to control systems; we started off with pneumatic control systems, and then we went to analog and electromechanical control systems over time. Building automation refers to the process of automating controls on a larger scale, such as for an entire building. As long as you can read electrical and mechanical diagrams, you can wo...
Bonus - HVAC Contractors and Distributors, Keys to a Great Partnership
June 23, 2017 18:36 - 41 minutes - 57.5 MBIn this podcast episode, Bryan and Mike Layton of Shore Distributors explain how HVAC contractors and distributors can build a great partnership. Shore Distributors is a wholesaler in Maryland that carries Carrier, Bryant, and Payne. The job of a territory manager is to help HVAC contractors, so they're there to help contractors. The territory manager's job is to help set contractors and dealers up for success, so they don't feel burdened by questions because it's their job to answer them....
TXV Operation, Diagnosis and Failure w/ Jamie Kitchen
June 20, 2017 15:15 - 1 hour - 95.5 MBIn this episode, Bryan talks with Jamie Kitchen from Danfoss about why and how thermostatic expansion valves (TXVs) fail and how they function in the first place. As fixed orifices become a dying breed with the development of higher-efficiency systems, TXVs take over the mantle as the primary method of expansion. Expansion valves meter the flow of refrigerant by aiming for a certain suction line superheat value. Unlike a fixed orifice, which has an opening of a constant diameter, an expans...
Check The Charge Without Connecting Gauges - Part 2
June 14, 2017 18:56 - 54 minutes - 74.8 MBIn this second part of the podcast, Jim Bergmann wraps up the steps to check a system charge without connecting a gauge manifold. You can check the charge without gauges if you use the following process (and know your DTD, CTOA, etc.): Take the dry-bulb temperature. (Let's say it's 70°F in this example.) Subtract the DTD (35°F). Add target superheat (10°F). Check the suction line. It should be 45°F in this example. If your probe senses a temperature that is NOT within 5°F of the tem...
Check The Charge Without Connecting Gauges - Part 1
June 13, 2017 19:19 - 41 minutes - 56.8 MBIn this episode of the podcast, we talk about gauges. Jim Bergmann from Redfish Instruments and the MeasureQuick app explains why you may want to check a charge without using a gauge manifold. (That's not clickbait; if you've already connected gauges to a unit once, you can probably check the charge of that unit WITHOUT gauges moving forward.) HVAC units manipulate temperature and pressure in the refrigerant charge. Heat transfer occurs between the refrigerant and the environment, and vari...
Common Duct Design Mistakes w/ Jack Rise
June 06, 2017 22:28 - 1 hour - 91.1 MBIn this episode, Jack Rise talks about duct design regarding ACCA manual D, friction rate, face velocity, duct velocity, and what is ACTUALLY wrong with flex duct. Manual D causes a lot of confusion for technicians, and most techs have a limited understanding of it anyway. When determining a blower wheel for commercial ductwork, Jack Rise calculates pressure drops for all of his elbows in the ductwork and makes his decision based on those calculations. Residential HVAC is a bit trickier, a...
Why A/C Units Freeze w/ Eric Shidell
June 02, 2017 21:56 - 59 minutes - 82.1 MBIn this episode, Bryan speaks with Eric Shidell about some of the basics of system freezing, what causes it, and what to do about it. Freezing is a normal part of some equipment, such as low-temperature freezers and outdoor units on heat pumps. On straight-cooling systems, freezing is NOT normal and indicates poor operation. Ice formation starts on the evaporator coil and may spread to the compressor via the suction line. The best way to remove ice and defrost the system is to pull the dis...
Blower Door Testing, Building Performance & More w/ Corbett Lunsford
May 30, 2017 19:38 - 48 minutes - 67.3 MBCorbett Lunsford from the Building Performance Workshop and the Proof is Possible tour talks to us about the moral superiority of building performance testing, blower door testing, and much more. Building performance and HVAC have been becoming much more closely linked lately. So, it's a good idea for HVAC techs to learn a bit about building performance. In the HVAC world, we often see homes with extremely hot upstairs portions and cool downstairs questions. That is a complex building pe...
Introduction to CO2 w/ Andre Patenaude
May 25, 2017 19:52 - 41 minutes - 57.4 MBIn this episode of the podcast, Bryan talks with Andre Patenaude from Emerson about CO2 refrigeration, and transcritical booster systems. Modern CO2 systems are efficient and effective due to their electrical controls and components, including case and high-pressure controls. Carbon dioxide (CO2) is a good refrigerant to address global climate change. From a sustainability standpoint, carbon dioxide is a superior refrigerant to HCFCs and HFCs. Carbon dioxide is also an A1 refrigerant, mean...
Bill Spohn is the Man-ometer / 10 Years of TruTech Tools
May 23, 2017 18:36 - 48 minutes - 67 MBIn this just-for-fun episode, we celebrate 10 years of great tools and excellent customer service with TruTech CEO Bill Spohn. We hope you enjoy this lighthearted episode with some discussions about company culture, superior service, and a commitment to quality. TruTech's approach to service goes more beyond selling the tool. The engineers at TruTech aim to learn how technicians plan on using tools. Those engineers want to use their technological expertise to create products that make tech...
When Will Techs Be Replaced By Robots? w/ Adolfo Wurts
May 22, 2017 17:41 - 39 minutes - 54 MBIn this episode, Bryan talks with HVAC products designer Adolfo Wurts about technology, automation, and the coming robot apocalypse. Automation is a fear in many industries, and the HVAC industry isn't alone. Today, we talk about how instrumentation and AI technology may develop and what that will mean for the future of the industry. Some recent practices that have severely impacted the job market lately have been globalization (where work moves overseas) and automation (where machines rep...
EPA 608 Changes - What You Need to Know w/ Jeremy Arling
May 17, 2017 12:37 - 29 minutes - 41 MBIn this episode of the podcast, Jeremy Arling from the EPA comes on and answers some common questions about the new rule changes that affect recovery, leak repair, recordkeeping, and evacuation on HVAC and refrigeration systems. EPA 608 rules regulate the actions that technicians must take when it comes to refrigerants and the atmosphere, such as venting, recovery, and evacuation. It has always been illegal to vent HFCs, including R-410A. The changes to EPA 608 attempt to treat all refrige...
Evacuation 101 w/ Jim Bergmann
May 12, 2017 18:49 - 49 minutes - 68 MBIn this episode of the podcast, Jim reviews the basics of evacuation and dehydration. He also covers hoses and vacuum gauge placement. Evacuation may just seem like a method to suck air and water out of a system. However, it is an intricate science that lacks a lot of detail in most trades education programs. The deepest vacuum we can possibly pull merely offsets the atmospheric pressure and is actually not that deep; the deepest possible vacuum is -14.7 PSI (-29.92" Hg). The evacuation ...
Psychrometrics for Fun and Profit w/ Jamie Kitchen
May 08, 2017 19:37 - 52 minutes - 72.4 MBIn this episode of the podcast, Jamie Kitchen from Danfoss talks about wet-bulb, dry-bulb, relative humidity, dew point, enthalpy, and latent heat. These are the building blocks of psychrometrics, which deals with human comfort as it relates to temperature, humidity, and heat loads. Humidity is water vapor in the air. As the air's dry-bulb temperature increases, the more water vapor the air can hold. That is partially why dew is more common on cold mornings instead of hot ones. However, th...
Measuring Voltage Drop w/ Jim Bergmann
May 01, 2017 20:49 - 38 minutes - 52.8 MBIn this episode, Bryan and Jim discuss measuring voltage drop and what it means. They also cover some other pointers to keep from using parts to bandage a deeper issue. A common mistake that technicians make is not understanding what an ideal measurement is before making a measurement. For example, they may not know what the refrigerant pressures should be before they attach the gauges. Electrical measurements are the same, and voltage drop falls under that umbrella. Voltage refers to el...
Starting Up a New Chiller w/ Jeff Neiman
April 28, 2017 20:52 - 47 minutes - 65.7 MBIn this podcast, Jeff Neiman shares an overview of his chiller startup procedure and some things he looks out for when starting a chiller after the initial chiller installation. The actual chiller startup is typically the factory's responsibility (per the manufacturer); however, the "startup" that we're talking about refers to the installation and early maintenance. The first step is preparation. Neiman recommends having a copy of the installation manual and reading it beforehand. You sh...
Hard Start Kits, Types and Applications w/ James Bowman
April 25, 2017 22:18 - 51 minutes - 71.3 MBIn this episode Bryan talks with James Bowman, technical director at Rectorseal, in person at the HVAC Excellence conference about hard start kits, potential relays and more.
Hard Start Kits, Types, and Applications w/ James Bowman
April 25, 2017 22:18 - 51 minutes - 71.3 MBIn this episode, Bryan speaks with James Bowman from Rectorseal about hard start kits, PTCR devices, run capacitors, compressor overheating, and the Kick Start product. We also go pretty in-depth on potential relays and how they operate. Hard start kits are mechanical potential relays connected to a capacitor, and they aid in starting the compressor. They come in two-wire and three-wire types. However, they have some pitfalls. For example, they are easy to abuse. You may also come across a...
Completing the Service Call Process (Part 2) w/ Les Fork
April 21, 2017 18:31 - 29 minutes - 41.1 MBIn part 2 of this conversation, we go through the condensing unit and wrap up the call with our no-fluff customer service best practices. The service call A thorough inspection is critical on any residential service call. A service call is an opportunity to check the integrity of the unit and the cleanliness of the blower wheel, drain, and other components. Check the charge, safeties, and five pillars. List the problems and present the solutions as suggestions. Provide appropriate timet...
The Residential Service Tech Process w/ Les Fork
April 20, 2017 18:44 - 33 minutes - 45.7 MBThis is part 1 of 2 on the soft skills practices of approaching and completing a residential service call in the best manner possible. Before the service call and good housekeeping Before a technician even leaves to go to work, they need to get their head in the game. Be ready to face the day by showering, shaving, and brushing your teeth. Having self-respect is also a sign of respect for the customer. The drive to work is a good place to clear your mind; you can listen to podcasts or do...
Electrical Myths P2 - Grounding & Bonding
April 18, 2017 22:18 - 35 minutes - 48.9 MBIn this podcast episode, Bryan talks about grounding and some common misunderstandings related to ground, neutral, ground rods, and lightning. The common phrase that "current goes to ground" is a myth. The transformer (or the power source) that feeds a building creates a potential difference in charges (voltage); current is the motion of electrons between a difference in charges. A transformer has three terminals: two legs and the XO terminal (neutral). You have 240 volts between legs an...
Ice Machines and Tech Support w/ Nick Messick
April 14, 2017 20:54 - 29 minutes - 40.4 MBBryan talks with Nick Messick about some ice machine basics. They also discuss how to determine when to pick up the phone and call tech support. Ice machines have the same basic refrigeration circuit as HVAC systems. However, ice machines require a much different cleaning regimen. Many maintenance people neglect ice machines by using incorrect cleaners. You need more of a sanitizer than a cleaner; sanitizers kill germs and fungi, but cleaners work better on corrosion. When cleaning an ice ...
Sometimes a #12 Wire can go on a 40A Breaker
April 10, 2017 20:42 - 46 minutes - 64 MBIn this episode of the podcast, we talk about condenser wire sizing considerations, ampacity, temperature, conductor sizing, voltage drop, and why a #10 wire doesn't always require a 30-amp breaker. There's usually nothing wrong with OVERSIZING a wire or conductor. However, you still need to know which wires are safe for operation and comply with the National Electrical Code (NEC) protocols. Relatively small conductors can carry relatively high voltages. Instead, amperage dictates the si...
Techs vs. Engineers w/ Bill Spohn from TruTech
April 04, 2017 21:26 - 28 minutes - 38.7 MBIn this episode of the podcast, we talk to Bill Spohn from TruTech Tools about how TruTech Tools got its start and some of the ways that techs and engineers approach problems differently. Bill Spohn is a majority owner of TruTech Tools who became invested in the HVAC field in the 1990s. The beginning of TruTech Tools was a milestone in Bill's professional journey. After working at Superior Valve for a few years, Bill moved to Testo. While Americanizing many of Testo's products, Bill Spohn ...
Emergency Boiler Repair - Tech Ride along
April 04, 2017 17:37 - 22 minutes - 31.5 MBIn This episode Justin talks about the trials and benefits of working out of town, long drives and this weeks boiler service calls in detail.
Ductless Installation P2 - Flaring, Charging and More
March 31, 2017 23:21 - 37 minutes - 51.1 MBJesse and I talk about MORE best practices for installing ductless systems. Both lines should be insulated on a ductless system because they have electric expansion valves in the outdoor unit. Insulating flares is also a critical task. When it comes to flare fittings, overconfidence is a tech's biggest enemy. Techs often undervalue the process of reaming copper or overdo it. Bubble-testing the flare joints is always a best practice to evaluate the integrity of your flares and check for lea...