HVAC Know It All Podcast

HVAC Culture: Training Like A Family w/Kat McCarrey

17 Feb 2024

Contributed by Lukas

We speak to Kat McCarrey about her rise to the top within her HVAC career. We also speak about HVAC training culture and Helios' family like atmospher...

The HVAC and Plumbing Champ w/Craig Childress

06 Feb 2024

Contributed by Lukas

We speak to Craig Childress, the HVAC and Plumbing Champion of the Elite Trades competition. www.cintas.com/HVACKnowItAll Save 8% on your purchase htt...

Evacuation and Recovery Best Practices w/Jesse Stewart

02 Feb 2024

Contributed by Lukas

We speak to Jesse Stewart from Navac about evacuation and refrigerant recovery best practices. www.cintas.com/HVACKnowItAll Save 8% on your purchase h...

A Sensible Approach To Indoor Air Quality w/Chris Howells and Brandon Glancy

23 Jan 2024

Contributed by Lukas

We speak to Chris Howells and Brandon Glancy from AprilAire. We discuss indoor air quality monitoring and why it's an important first step to IAQ solu...

HVAC Warranty Price Tag: How We Can Spend Less On Equipment

22 Jan 2024

Contributed by Lukas

If everyone in the HVAC/R industry started to install properly right now, it would take some time to show a decline in warranty claims. But neverthele...

Writing Off Personal Vehicles With Your HVAC Business: Evolution Of An HVAC Business Ep. 21

19 Jan 2024

Contributed by Lukas

I have discovered that leasing a personal vehicle through my HVAC business and flipping it every 3 years will save a few thousand dollars in repair co...

Not Your Average HVAC Customer w/Kevin Reid Morris

12 Jan 2024

Contributed by Lukas

In the fall, I installed a Moovair heat pump for Kevin. He is not your average HVAC customer. We discuss his century home and how his renovations have...

Thinking About Heat Pump Design: Live At The Heat Pump Symposium

09 Jan 2024

Contributed by Lukas

Live at HRAI's first Heat Pump Symposium we speak to Guillaume Caillé from Tosot Bathica, Dev Mylrajan from Intech and Lyndsay Showers-Pearce from En...

Heat Pump Symposium Live Part 1 w/Erik Rasmussen, Paul Willmus and Jim Bolger

03 Jan 2024

Contributed by Lukas

Live at the first annual HRAI Heat Pump Symposium in Toronto, ON, we talk with Erik Rasmussen of Master, Paul Willmus of Johnson Controls and Jim Bolg...

Father Son HVAC w/Ken Perkins and Ken Perkins Jr.

02 Jan 2024

Contributed by Lukas

We speak to Ken Sr who I met in Florida with the Helios Team his and Kenny Jr. We talk about father son relationships within the trade the HVAC and Re...

Heat Pump and "Electrification" Infrastructure w/ Tom Buescher

29 Dec 2023

Contributed by Lukas

We speak to Tom Buescher from Copeland about heat pumps and electrification infrastructure. Master Survey https://www.surveymonkey.com/r/7BJWS9Q www.c...

HVAC Consultant: Adding It To Your Services, Evolution Of An HVAC Business Ep.20

28 Dec 2023

Contributed by Lukas

Adding HVAC consultant to your services in your already established HVAC business: This can lead to more revenue when you're really good within your n...

Refrigeration Side Troubleshooting w/Jamie Kitchen

22 Dec 2023

Contributed by Lukas

We speak to Jamie Kitchen from Danfoss on "Refrigeration" side troubleshooting. www.cintas.com/HVACKnowItAll Save 8% on your purchase https://www.trut...

My HVAC Life w/Giana Brucella

13 Dec 2023

Contributed by Lukas

I speak with Giana Brucella from the Fujitsu "As Cool As It Gets Podcast". She asks me many great questions and we speak openly about HVAC, social med...

Climbing The HVAC Ladder w/Joshua Macy

12 Dec 2023

Contributed by Lukas

I speak with Josh Macy, Regional Service Manager at Helios Service Partners. We speak about how Josh, a young HVAC technician, was able to climb the l...

Electrification and "The Grid" w/Michael Richardson

07 Dec 2023

Contributed by Lukas

We speak to Michael (Mick) Richardson about electrification and the power grid. Mick tells us what New Zealand is currently doing to prepare. www.cint...

HVAC Knowledge Gaps w/Ken Perkins

28 Nov 2023

Contributed by Lukas

We ride along with Ken Perkins. Ken is the midwest Director of Field Ops for Helios. We discuss HVAC knowledge gaps that need to be addressed.

Evolution Of An HVAC Business Ep.19 : HVAC Marketing That Works

22 Nov 2023

Contributed by Lukas

We discuss HVAC marketing strategies that have helped keep me busy as a new business owner. Check out the Jobber link. https://getjobber.com/hvacknowi...

Steam Humidification w/Chris Howells

17 Nov 2023

Contributed by Lukas

We speak with Chris Howells from AprilAire about steam humidification. We talk about checking water quality with a TDS meter and install best practice...

Heating Start-Ups w/Tony Furst

10 Nov 2023

Contributed by Lukas

We speak to the all knowledgeable Tony Furst from Armstrong Fluid Technology on heating start ups and we get Tony's view on continued training. www.ci...

Why Training Matters In HVAC Rant

03 Nov 2023

Contributed by Lukas

On this episode, Gary (me) rants on about how training will always win over assuming HVAC techs should "just know" how to do it. Continued training an...

Combustion Analysis w/Nick Stojkovski

31 Oct 2023

Contributed by Lukas

We speak to Nick Stojkovski from INFICON about some combustion analysis tips and best practices. www.cintas.com/HVACKnowItAll. Check out Wizehire.com ...

Evolution Of An HVAC Business Ep. 18: Avoiding Burn Out

28 Oct 2023

Contributed by Lukas

Avoiding burn out as a business owner is very important in the HVAC/R trade. A burned-out individual is more likely to make mistakes, or get themselve...

Surge Protection and Voltage Monitoring w/Fred Kreusch

25 Oct 2023

Contributed by Lukas

We speak to Fred Kreush from ABLE Power Products (partners with RectorSeal) regarding surge protection, voltage monitoring, and UL safety requirements...

Boss vs. Leader w/Tony Furst and Anish Suthesh Arul

17 Oct 2023

Contributed by Lukas

We catch up with Tony and Anish from Armstrong Fluid Technology to discuss boss vs. leader. www.cintas.com/HVACKnowItAll. Check out Wizehire.com Check...

The "Don" of A2L Refrigerants w/Don Gillis

13 Oct 2023

Contributed by Lukas

We speak to Don Gillis of Chemours about A2L refrigerants and where the industry is heading with them. www.cintas.com/HVACKnowItAll. Check out Wizehir...

Hot Surface Ignition w/Jim Fultz

29 Sep 2023

Contributed by Lukas

We speak to Jim Fultz about the White-Rodgers Hot Surface Ignition Module 50E47U-843. www.cintas.com/HVACKnowItAll. Check out Wizehire.com Check out h...

Evolution Of An HVAC Business Ep. 17: Creating A Fair Value Exchange

22 Sep 2023

Contributed by Lukas

There are many HVAC companies out there operating as "loss leaders". This business practice can turn shady, as the loss needs to be made up somewhere,...

Ductwork Design and Sizing w/John Stischok

18 Sep 2023

Contributed by Lukas

We speak to John Stischok from Armstrong Fluid Technology about ductwork design and sizing. www.cintas.com/HVACKnowItAll. Check out Wizehire.com Check...

HVAC Business Owner: One Man Show w/Jamie Christensen

12 Sep 2023

Contributed by Lukas

We speak to Jamie Christensen, who ventured out on his own as an HVAC business owner and one man show. Jamie brings us up to speed on how his HVAC bus...

Keeping Healthy In HVAC/R And In The Skilled Trades w/Andrew Jax

11 Sep 2023

Contributed by Lukas

We speak to Andrew Jax, former Australian body builder and founder of 6 Pack Dad, about how us in HVAC/R and the skilled trades can become healthier a...

Refrigerant Charging Procedures w/Craig Migliaccio

28 Aug 2023

Contributed by Lukas

We speak to Craig Migliaccio from AC Service Tech on refrigerant charging procedures. Craig has some amazing books out there, Refrigerant Charging and...

Thread Sealant, Refrigerant Leaks and Coil Cleaning w/Refrigeration Technologies

21 Aug 2023

Contributed by Lukas

We have the crew on, John Pastorello, Mike Pastorello and Ashley Lynds, to discuss a few topics. We discuss thread sealant, more specifically how Nylo...

Theft Of Refrigerant and HVAC Equipment w/Jerry Myren

21 Aug 2023

Contributed by Lukas

We speak to Jerry Myren from Rectorseal regarding theft of refrigerant and refrigerant huffing, but also the theft of HVAC equipment. We speak about A...

Evolution Of An HVAC Business Ep. 17: Every HVAC Business Owner Should Own A Megger

16 Aug 2023

Contributed by Lukas

Every HVAC business owner should own a megger and know how to use it, why? Because you'll find the faults, your competition is getting callbacks on. C...

A Refrigerant Discussion w/Jamie Kitchen and Jorg Saar

31 Jul 2023

Contributed by Lukas

There are many changes on the horizon when it comes to refrigerants. A2L's, R290, drop ins etc, are becoming more prevalent in the HVAC and Refrigerat...

Buidling Soft Skills In The Skilled Trades w/Tony Furst

25 Jul 2023

Contributed by Lukas

We speak to Tony Furst from Armstrong Fluid Technology regarding soft skills and why they are important for building client trust and maintaining clie...

The Ins and Outs of Subcooling w/Jamie Kitchen

18 Jul 2023

Contributed by Lukas

We speak to Jamie Kitchen from Danfoss regarding subcooling. If you missed out on the superheat podcast with Jamie check it out here. Listen to the mo...

Geothermal And Heat Pumps For High Rise Applications w/Andrei Hari and Adam Alacia

17 Jul 2023

Contributed by Lukas

We speak to Andrei Hari from Armstrong Fluid Technology and Adam Alacia from Geosource regarding a high Rise geothermal site which included in suite h...

Evolution Of An HVAC Business Ep. 16: Don't Always Try For The Big Sale

13 Jul 2023

Contributed by Lukas

On this episode of evolving our HVAC/R business we discuss creating customer options that will land you a life long client. Too many only offer new eq...

How To Hire, Retain and Fire: In The Skilled Trades w/ Sid Upadhyay

29 Jun 2023

Contributed by Lukas

We speak to Sid Upadhyay from WizeHire about hiring and retaining talent and "potential" talent. We also speak about how to fire a person the correct ...

High Velocity Systems and Zoning w/Lou Pulice

26 Jun 2023

Contributed by Lukas

We speak to Lou Pulice from Ecosmart regarding high velocity systems and zoning. http://www.cintas.com/HVACKnowItAll. Check out Wizehire.com Save 8% o...

Air Bypassing The Evaporator Coil: How To Determine It

20 Jun 2023

Contributed by Lukas

On a recent call, after some basic troubleshooting. I found that air was bypassing the evaporator coil. I explain how I came to that conclusion on thi...

From Field Tech To Distribution: A Females Perspective w/Lauren Cassa

16 Jun 2023

Contributed by Lukas

We speak to Lauren Cassa from the Master Group. She began a career in the skilled trades on the road as a refrigeration apprentice. She switched it up...

Evolution Of An HVAC Business Ep 15: Saying No In HVAC

13 Jun 2023

Contributed by Lukas

Learning to say no is sometimes difficult, especially when your HVAC business is new. Don't get overwhelmed and don't trade more money for more stress...

HVAC Part Load Situations and Dehumidification w/John Stischok and Tony Mormino

02 Jun 2023

Contributed by Lukas

We speak to John Stischok from Armstrong Fluid Technology and Tony Mormino from Insight Partners regarding HVAC part load and dehumidification. http:/...

Commercial HVAC Service vs. Residential HVAC Service w/Matt Waxer and Jason Norman

29 May 2023

Contributed by Lukas

Commerical HVAC/R service is a bit different from servicing residential HVAC equipment for many reasons. http://www.cintas.com/HVACKnowItAll. Check ou...

Lineset Covers w/Ken Lyons

26 May 2023

Contributed by Lukas

We speak to Ken Lyons from Rectorseal about lineset covers. They set the job off nicely aestics wise and give a professional look to the finished prod...

Evolution Of An HVAC Business Ep 14: Being Assertive In Business

12 May 2023

Contributed by Lukas

On this episode, we discuss assertiveness in Business and why it's important. Check out the Jobber link. https://getjobber.com/hvacknowitall

Ultrasonic Refrigerant Leak Detection w/Nick Stojkovski

02 May 2023

Contributed by Lukas

We speak to Nick Stojkovski from INFICON about ultrasonic leak detection and their Whiper product. Nick helps us to understand the technology better a...

Wifi Thermostat Functions (Sensi Touch 2 Smart) w/ Jim Fultz

28 Apr 2023

Contributed by Lukas

We speak to Jim Fultz from Emerson about some wifi thermostat functions pertaining to the Sensi Touch 2 Smart Thermostat. http://www.cintas.com/HVACKn...

#betterhvac w/Jim Bergmann

20 Apr 2023

Contributed by Lukas

Catching up with Jim Bergmann from measureQuick. We speak about heatpumps, electrification and how technicians can perform #betterhvac Here is the lin...

Random HVAC Words Or Phrases : HSPF (Heating Seasonal Performance Factor

19 Apr 2023

Contributed by Lukas

HSPF or Heating Seasonal Performance Factor is used to quantify the efficiency of air cooled heat pumps in heating mode.

Evolution Of An HVAC Business Ep 12: Doing It Right The First Time

14 Apr 2023

Contributed by Lukas

As a small business or one man show, it becomes critical in doing it right the first time. Staying an extra hour so the next day you can move on the n...

Cooling Start Ups w/Tony Furst

14 Apr 2023

Contributed by Lukas

We speak to Tony Furst from Armstrong Fluid Technology regarding cooling start ups. We deep dive into cooling start up considerations and why using ga...

Skilled Trades and Abusive Behavior w/ Brandi Ferenc and Matt Showers

01 Apr 2023

Contributed by Lukas

We speak to Brandi Ferenc, with guest host Matt Showers from the Trade Therapy Podcast, about Brandi's mission to stop the abusive environment that ex...

Corrugated Stainless Steel Tubing w/ Chris Battersby

30 Mar 2023

Contributed by Lukas

We speak to Chris Battersby of Batscan regarding corrugated stainless steel tubing, how it can be utilized for gas piping and some bonding requirement...

Random HVAC Words Or Phrases: Air Changes Per Hour

21 Mar 2023

Contributed by Lukas

On this episode of "Random" HVAC words or phrases, we tackle Air Changed Per Hour or ACH. Check out this article for more info. https://cleanair.camfi...

Industrial HVAC and Ammonia w/Mark Rebilas

17 Mar 2023

Contributed by Lukas

We speak to Mark Rebilas from Armstrong Fluid Technology on some industrial HVAC and ammonia safety. http://www.cintas.com/HVACKnowItAll. Save 8% on y...

HVAC/R And Skilled Trades Training Culture w/Ken Midgett and Dan Clapper

15 Mar 2023

Contributed by Lukas

We speak to Ken Midgett and Dan Clapper from Interplay Learning about what it means to build a training culture in the skilled trades. http://www.cint...

Building Comfort w/Tim DeStasio

10 Mar 2023

Contributed by Lukas

We speak to Tim DeStasio about the home he is building and what he's implementing on the building envelope side and HVAC side to gain true comfort wit...

Evolution Of An HVAC Business Ep 11: When Your Vehicle Is Down And Out

07 Mar 2023

Contributed by Lukas

We discuss the trials and turbulations when your truck or van goes down for repairs in a small HVAC/R business. https://getjobber.com/hvacknowitall

Superheat, Parts Shortage and Oil Separation w/Brett Wetzel and Kevin Compass

23 Feb 2023

Contributed by Lukas

We speak to Brett Wetzel and Kevin Compass from the Advanced Refrigeration Podcast about many topics including superheat, parts shortages and oil sepa...

Drain Pan Heaters In Cold Weather Heat Pumps

15 Feb 2023

Contributed by Lukas

Using a drain pan heater on the outdoor unit of a cold weather heat pump will help prevent ice build-up, which can cause coil and fan damage. http://w...

Inverter Compressor Technology and Ductless Install Considerations w/Gerry Wagner

14 Feb 2023

Contributed by Lukas

We speak to Gerry Wagner of Tosot Bathica about inverter compressor technology, his take on electrification and ductless split install considerations....

A Data Driven Approach To Indoor Air Quality w/JJ Baird

13 Feb 2023

Contributed by Lukas

We speak to JJ Baird from Airthings about the right approach to monitoring and rectifying indoor air quality issues within a home or building. http://...

Evolution Of An HVAC Business Ep 10: GPS And How To Use It

10 Feb 2023

Contributed by Lukas

GPS can be a great tool, if used properly. But if it's weaponized against your HVAC/R techs it can be major issue in terms of company morale. https://...

Live HVAC Industry Chat

31 Jan 2023

Contributed by Lukas

I jumped onto a live webinar with my pals from Armstrong Fluid Technology to discuss many industry topics. http://www.cintas.com/HVACKnowItAll. Save 8...

Commercial Kitchen Equipment w/Pat Finely and Matt Showers

27 Jan 2023

Contributed by Lukas

We speak to Pat Finely from Commercial Kitchen Chronicles podcast with guest co-host Matt Showers, host of the Trade Therapy Podcast. We discuss ice m...

Mini Split Install Accessories w/Michael Emerick

25 Jan 2023

Contributed by Lukas

We speak to Michael Emerick from RectorSeal about some mini split (ductless system) install accessories that make the install easier and more efficien...

Should We Use Copper For Natural Gas?

20 Jan 2023

Contributed by Lukas

A little bit of a rabbit hole here, copper used in natural gas piping systems can produce copper sulfide and clog up valves. I talk about how this can...

Apprenticeship Training and Journeyman/Apprenticeship Realtionship

18 Jan 2023

Contributed by Lukas

We speak to Ilija Martinovich and Matt Waxer about HVAC apprenticeship training and how it's changed. We also talk about the journeyman and apprentice...

Psychrometrics w/ John Stischok

14 Jan 2023

Contributed by Lukas

We catch up with John Stischok from Armstrong Fluid Technologies to talk about psychrometrics and yes I think it's "nerdy". Catch the YouTube video on...

Evolution Of An HVAC Business Ep 9: Call Backs

10 Jan 2023

Contributed by Lukas

Call backs for any HVAC/R business can be crushing to time and the bottom line. But call backs for a new business can stunt momentum and good online r...

Motivation and Electrification

31 Dec 2022

Contributed by Lukas

2023 has many opportunities for the HVAC and Refrigeration industry. Stay motivated and keep up on trends like electrification. http://www.cintas.com/...

Universal Heating Parts w/Jim Fultz

29 Dec 2022

Contributed by Lukas

We speak to Jim Fultz from Emerson. Our main focus was universal heating parts and the new IFC 50M56X-843 universal furnace board. http://www.cintas.c...

Variable Frequency Drives (VFDs) Basics w/Anish Suthesh Arul

20 Dec 2022

Contributed by Lukas

We speak to Anish Suthesh Arul from Armstrong Fluid Technology about VFD or variable speed drive basics. Jobber 40% off offer from Dec 19 to 22 and 26...

Air Conditioning and Refrigeration Ball Valves w/John Foster and Amit Gutbir

13 Dec 2022

Contributed by Lukas

We speak to John Foster and Amit Gutbir from NDL about air conditioning and refrigeration ball valves. We talk about ball valve anatomy and install be...

Evolution Of An HVAC Business Ep.8: Leveraging Other People's Customers

01 Dec 2022

Contributed by Lukas

On this episode, we discuss how to leverage other people's customers when starting your own HVAC/R business. https://getjobber.com/hvacknowitall

Airflow And Why It's Important w/Steven Rogers

30 Nov 2022

Contributed by Lukas

We speak to Steven Rogers from The Energy Conservatorty about airflow and why it's important. Static pressure video https://youtu.be/wHeOe06z70w http:...

Dehumidification Stratagies w/ John Stischok

23 Nov 2022

Contributed by Lukas

We speak to John Stischok from Armstrong Fluid Technology about some dehumidification stratagies and ways we can better control high humidity levels. ...

Waterless Traps and Condensate Codes w/Connie Loughhead

18 Nov 2022

Contributed by Lukas

We speak to Connie Loughhead, President at Des Champs Technologies. We discuss the waterless HVAC Air Trap, condensate drainage codes and we also touc...

Digital Tools w/Aaron Longacre

09 Nov 2022

Contributed by Lukas

We speak to Aaron Longacre about digital tools and how they have advanced the trade. We also discuss the new Testo 560i digital scale and Intelligent ...

Evolution Of An HVAC Business Ep 7: Customer Show And Tell

01 Nov 2022

Contributed by Lukas

Showing your HVAC/R customers proof of failed parts or equipment is a true fire way to capitalize on repair or install work. A simple show and tell wi...

Hydronic Snow Melt Systems w/Tony Furst

31 Oct 2022

Contributed by Lukas

We discuss hydronic snow melt systems for driveways and patios with Tony Furst from Armstrong Fluid Technology. http://www.cintas.com/HVACKnowItAll. S...

HVAC/R And Mental Health w/Aaron Gibson

23 Oct 2022

Contributed by Lukas

I had the pleasure of catching up with Aaron Gibson, host of "JustOff The Cuff HVAC" regarding mental health in the HVAC/R trade. http://www.cintas.co...

Condensate Neutralization w/Kyle Emmons

17 Oct 2022

Contributed by Lukas

We speak to Kyle Emmons from JJM Alkaline Technologies about condensate neutralization on high efficiency heating equipment. http://www.cintas.com/HVA...

Evolution Of An HVAC Business Ep 7: Investing Back Into Your Business

11 Oct 2022

Contributed by Lukas

Investing back into your new HVAC/R business is the only way to grow it. Accumulating the right assets over time will make your business and jobs more...

UV Lights For IAQ And Misconceptions w/Aaron Engel

06 Oct 2022

Contributed by Lukas

We speak to Aaron Engel from Fresh-Aire UV about UV lights for IAQ, UV misconceptions and answer some listener questions on the subject. http://www.ci...

In-Floor Radiant Heating w/Tony Furst

28 Sep 2022

Contributed by Lukas

We speak to Tony Furst from Armstrong Fluid Technologies about the advantages of in-floor radiant heating. http://www.cintas.com/HVACKnowItAll. Save 8...

HVAC Journey"wo"men w/Brittany Kuegel

22 Sep 2022

Contributed by Lukas

We speak to HVAC Journeyman Brittany Kuegel from Kentucky about her career, her goals and of of course how she pulls a vacuum. Cintas Link http://www....

Evolution Of An HVAC Business Ep 6: Staying Productive In Shoulder Seasons

14 Sep 2022

Contributed by Lukas

Shoulder seasons in the HVAC trade can slow the work load down at times. This doesn't mean we can't stay productive, especially with other tasks that ...

Condensate Management w/Sean Holloway

11 Sep 2022

Contributed by Lukas

Condensate management is very important when it comes to HVAC and Refrigeration. Proper condensate piping, routes, safety pans and other prodcucts can...

Hydronic Heat Exchangers w/Israel Piantini

31 Aug 2022

Contributed by Lukas

We speak to Israel Piantini from Armstrong Fluid Technology about hydronic heat exchangers, types and applications. Cintas Link http://www.cintas.com/...

Radon w/Brian Kennihan

26 Aug 2022

Contributed by Lukas

We speak to Brian Kennihan of AprilAire about Radon. What is it, where is comes from and ways to test and mitigate Radon levels in the home. Cintas Li...

The Open Minded Unassuming HVAC Tech

18 Aug 2022

Contributed by Lukas

HVAC professionals, it's best to operate with an unassuming mind set, nothing is ever absolute. On this episode we discuss keeping an open mind, verif...

Warranties In HVAC And Refrigeration w/Tommy Cue

18 Aug 2022

Contributed by Lukas

I speak to Tommy Cue from JB Warranties about how warranty programs work in the HVAC and refrigeration trades. Cintas Link http://www.cintas.com/HVACK...

HVAC Business: From Start Up To Selling It w/Tim De Stasio, Nathan Moore and Jamie Christensen

10 Aug 2022

Contributed by Lukas

We speak to 3 business owners about starting up and running an HVAC business and then eventually selling it. Cintas Link http://www.cintas.com/HVACKno...

Evolution Of An HVAC Business Ep5: Building Customer Value

09 Aug 2022

Contributed by Lukas

Building value for your customer is super important for a new HVAC business. On this episode, we discuss some ways to do this. https://getjobber.com/h...

Surge Protection w/Jerry Myren

29 Jul 2022

Contributed by Lukas

We speak to Jerry Myren from Rectorseal about surge protection and surge protection devices. Cintas Link http://www.cintas.com/HVACKnowItAll. Save 8% ...