Craig you have a true teaching gift! So much appreciate you providing all your information to us technicians. Thank you!

You're really creating a great legacy here Craig - it will live on even after your career is over. Sharing knowledge freely the way you do is one of the more noble things one can do. Bravo

You’re a true educator my guy, been in the field for several decades now,I’d be lying if I say I’ve worked on every unit in this video and don’t need an assist . We forget most of what we work on if we don’t see it on regular basis. I personally need to refresh,and polish my skills every now and then,and believe your channel gives me the best opportunities to do so. Thank you for what you bring to our field Greg 👍🏽👍🏽

I’m a newer technician, just moved from South Carolina to Ohio. Your videos have been a tremendous help getting me up to speed!

New hvac student here the sequence of operations in the beginning is a lifesaver. I’m sure the rest will come to me with experience

It’s makes me mad I paid 15k for trades school when everything I learned was in this video smh 😢

Your knowledge and the way you deliver that knowledge lends trust in what you say to be true. With your teaching and a lot of effort anyone could be a professional HVAC tech. Keep up the great work, and thank you.

I have years watching and learning from a true passionate technician. I really appreciate the time you take to share your knowledge with us here. Because of your teachings, I have become a much more confident technician and my knowledge has been expanded. Thank you very much

Wow, wow, wow, your videos that you are showing online are phenomenal. I was an aircraft mechanic for 20 years then I became a locomotive engineer for the last 16 years, now I’m retired. When it was time to replace a 30 year old furnace I thought why not just get a package AC/furnace unit. After installation, (installed by licensed personal) I opened the panels to get model numbers and serial numbers for warranties. I thought to myself what a mangled spaghetti mess of wiring, all of this just to run a furnace and air conditioner. After realizing the cost of any service call, I decided that I needed to learn how my furnace works. After two months of watching all your videos I’m able to identify what every wire does in my furnace and AC compressor unit. I know what each component does and the purpose of it. I'm still learning some troubleshooting techniques. At this point the only thing that I know that I will not even attempt to do is to, replace any component that will break the integrity of the refrigerant system. If anything needs to be braised/soldered, the cost of having that done will be close to the price of a new unit. Its better just to buy a new unit. I did take an AC course in collage for diesel mechanic in which we had to get a 608 certification. I don't know if you offer that or not, but this would be the place to learn on how to handle refrigerants Every homeowner needs to know how this equipment works, even if they're not going work on it, they still need to know how to maintain it. I can only imagine how many house fires were caused by homeowners neglecting and or being naive towards their furnace and AC units.

Your videos are outstanding and very educational. 2nd year service tech here and I always find myself coming back to your videos for refreshers and learning something new! Thanks Craig!

Thank you so much I recognize your time involved in creating these videos, I am so happy to find you I know you are a Legacy to the next Generation people that is getting involved in these trade 25 years ago I was involved in clases. Like the one that you giving , I think about the many people that you are blessing with your knowledge, I am retired but like to watch videos like yours thank you for those that you are helping , that’s what I call a human with a Purpose in these world thank you. Because you are putting food in the tables of many family’s with these videos, GOD bless you and your family, thanks to all involved , blessings

I've been watching you for years. These training videos are great. They have helped me so much. Thank you.

*Love the size and it fits perfectly in a corner but **Fastly.Cool** the whole room. Really like how you can auto adjust how long you want the fan to be on. It is quite but highly effective.*

You tube should high value this content it is helping a lot of people to grow and be better or become a help to society.

Yes ! Craig a want you to know you're the best instructor , and my confidence and skill level in the field is continuing to improve thanks to these videos .

The greatest part of knowledge, is sharing it… thank you sir

Craig, you're an excellent instructor. I was a teacher for 13 years and saw your passion for the trade and sharing the knowledge and skills you learned all these years. I went to BFIT in Boston to learn the trade. I am learning a lot from your videos. Plus I already both your books as a bundle but I didn't get the cards. I must have done something wrong when ordering. Great job!

This is so excellent, I wish I had this when I first started. Great job, and thank you for this free knowledge

I’m going into my 3rd year in the trade, and into my 2nd heating season as a service tech. This video was a nice little refresher.

Wow - this was such an amazing crash course! I learned that, once you break the system down to its parts and give context to those parts, everything seems so much simpler. I appreciate you for making this freely available!

I went to school I didn't learn much with this guy Im really learning

"very much easier" ac service tech is one of my favorite channels

Starting HVAC school in about a week and I’m super nervous don’t know much but these videos are a big help 😬😬😬

Craig is such a master teacher that it’s almost a joke.

Thanks for all you doing for this community

Great class for gas furnace, much appreciate your generous sharing with us. God bless you!

Fantastic teaching

Great Video! On test leads with fluke meters I have often read a small resistance below one ohm. I only would replace the leads if that resistance varies and can add from there. Thanks for excellent lessons.

Hello, Craig, when will you come out with a furnace class book? Roy Fields

Great content, very thorough and informative. Thank you!

Awesome instruction, my friend. Clear, informative, and applicable. 👍👍

What an incredible history/educational lesson!

Glad I found you you wouldn’t happen to have motorhome/camper furnaces handy would you that would be a very interesting component to learn as well will bring you millions of views .

GREAT presentation. Thank you for sharing your knowledge. Keep up the great work.

Another one of your excellent videos saved to my favorites to be passed to younger technicians asking questions about this topic 👍

This channel has made me such a better technician. Thank you so much!

All the content on this channel is GOLD!

this was great thank u

I love all your videos but this one is the best. Thank you

Thank You Craig!!

Best teacher ever I see Craig

Im just here cause I'm interested. I'm thankful I didn't go to school for this. This is too much to think about. And this is just some furnaces. Didn't even get into boilers yet or anything else. Crazy how techs figure stuff out. Would drive me crazy. I get distracted very very easily.

Your channel has helped me and everyone I know! Thank you!

Wishing all at ac service tech an early happy new year from the uk. Really enjoy your classes very informative.

Boy did I get a good laugh. Your story of when you went and pulled the silicone carbide HSI earlt on in your career. well.... I am only a second year apprentice, like you, I did the same thing recently and accidentally banged the HSI and it broke into multiple pieces lol. Great video!

You're really good teacher.

Absolutely educational great job thank you so much

is to good to be true ,I see it every season thank you r the best Snoowaircondition houston

Best training video!

Comment for algorithm. Will watch in full later. Thank you sir.

Nice work,keep em coming Morris county NJ Native Thks Man!!!

Another excellent video. Thank you Craig

Thank you for sharing your wisdom!

You are HVAC God.

Excellent video!

I really love this

awesome Craig!!!!! thank you for sharing.

Excellent video. Thanks for sharing.

Thank you, Best wishes

Extraordinario como siempre mil grscias

Impeccable sir! Thank you.

What a great video Craig! You the man! I greatly dislike smart valves 😂

Thanks!

Great lecture!

wow, that was a great video!

Learned a lot, great video.

Very educational 👍

i have to say, this is so awsome and my gas furnace pilot light is off...then i know every part of it...thanks

Nice work!

EXELENT explanation

You one of the best .

Keep up the good work

You're my hero

Always useful! Thanks

Real great video, packed with great tips and info. Thanks Craig.

I have a high efficiency furnace, according to the tech that came to look at it, but they think we need a new one and its a 2008 model lennox furnace. when do you think one would upgrade a furnace given the age of my furnace. Of course, like a car, one has to maintain it but im a new home owner and learning more each day about our home, including the furnace.

Amazing video, thanks!

Thanks awesome video!

Great very informative 👍

Great info

Whoah this video is legit no cap

Good video

The thermopil is a generator the pilot heats it and it generates milivolts

Great video - thank you. I am going to replace the furnace in my home that is 6500 feet above sea level. What adjustments or modifications do I need to do at this high altitude? Thank you

Hello. Great video. I live in an apartment and the gas furnace stops working during a power outage. Can I connect a vehicle battery or some other power source to the furnace so that it will run during power outage? Thanks

Thank you - Great video in explaining everything about the furnace! But I do not understand the explanation of the ground voltage drop test @52:35. Why is the check measurements are in ohms instead of volts? I think you may meant to say is that with the power on (120V), the voltage drop should zero (therefore no resistance ), but if instead the voltage reading is like 0.4 V then that means there is problem (i.e. there is unaccounted resistance somewhere)?

Love it 🔥

Gran maestro lo siento pormi no se ingles pero es interesante arreglar esos equipos yo solo me dedico equipos de línea blanca

Good sir

Thank you so very much for your efforts, I have a question, I see a part or two on the installed out on the return they have red wires and blinking indicators, what’s do you call that? and what the purpose of it? Thank you

On that millivolt gas valve. How important is the wiring colors to terminals? Does it matter where the red and white wires go on the terminals? Will it work with red wire on th and white wire on TH TP?

Hello, I have a gas furnace and we bought heat pump a few years ago but can't find a person that can program it correctly to provide heat with two zones and be able to switch between gas and heat pump. Will be thankful for your input

Finally finished watching!🤣 Thanks again for the videos! 🍺🍺🍺🥃🥃⛳🎳 Stay safe. Retired (werk'n)keyboard super tech. Wear your safety glasses!

Is there ANY way that a 90% natural gas furnace could be venting what smells like a faint smell of "car exhaust" or the like!? I feel like when my furnace is on blowing I can detect that. It is not all the time either. It only seems to happen when the temperature goes down to colder temps. Is it possible to have a crack or something like that in the heat exchanger or something that could cause this? Also, I feel that in the summer I can also detect something when the cooling unit is on blowing. I dont know what to think about all of it! ?

I didn't hear teaching about cabon monoxide in haler or ditector.

Has anyone found any practice test questions or apps specifically for the NATE Support Technician exam?

Is it correct that my 25 year old Carrier 58GSC series upflow furnace does not have an inducer motor? My problem is that I set my thermostat and flip on the furnace power switch but only hear a click or clunk sound but nothing else happens.

can 80 percent effeciant furnace have no inducer fan ?

I start my first tech job Monday. Wish me well!

Hi i have a quesition how i can remove vaccum without vaccum pum to the refrigeretor?