How to size HVAC Equipment?  

My HVAC tech just asked me how many floor registers there was, and that was it. I would much appreciate having a complete estimate and homework on paper, to include labor and cost of each part. *Keep going Tad!*

You should make books my guy. Especially on topics like this. Me and thousands of others would buy and benefit from it!

2:10 lmao He said, "Ding!", like some food was done in the microwave. lol

Use manual J load calc

Hey Tad I just joined I have been electrician for 45 years and have my state lic for Freon but always sub out duct work time to learn Thanks Richie G

I just joined. I’m a tech of 4 years and now learning how to properly size units and ductwork as I am doing a complete install in a buddy’s basement that he wants to have finished.

Tad.... Was such a pleasure meeting you at SOE. I am stoked about learning more from you. Would love to catch up with you about being a guest on my podcast....

Highly recommend using a thermal imaging camera like the FLIR DM284 for identifying hold/cold spots of infiltration/exfiltration around doors, windows, duct work, etc.

Thank you.

Great Video. Gonna upgrade get a little more info. Love the knowledge

Do u need to measure the height to get the square foot ?

Hey i joined any tips on ductulatornsizing strategies

I’m some what new to HVAC and want to learn more can you help

Good job

Awesome video how do I become a member? I’ve interested in how to probably size up homes with round duct and what tonage I should use thanks tad

I am seeing everything upside down or backward!

Just subscribed. Would like to receive duct design guide. Thanks

My name is A.V from Atlanta Georgia. I joined your members group. I need full access to your videos

If I install a modulating system where it is able to run 30% to 100%, does it help if I oversize the system since it's able to run as low as 30% ?

Hi taddy have questions how we control humidity with the help of air flow

Hey it’s Gabe. With Martin Heating and Cooling. I’d like your advice and help on sizing a package unit. I really don’t want to mess this up given the situation and job. Should I become a member for your support?

Excellent video! In your opinion, do you the newer single stage units, with digital thermostats, tend to run for shorter cycle times, than the older units, even during the summer, in the south?

Would it work just by pulling the square footage from Zillow ?

Hi please tell me how do i become a member?

OK I have just bought a 985 sq. ft. single wide. Everyone is estimating it at 10,000.00 or more! I am disabled and on a strict budget. I live in Dallas Georgia and with my health problems I have to have air condioning. I have a 100 amp box and they say I have to upgrade and then the electrcians want to charge me 9,000.00 for that! Please help me!!!!! The system that is in it is 30 years old. Please help me!!!!!

Do you have to measure your square footage if the homeowner knows what their square footage is? Or is this just to verify because they could be wrong?

I live in 1920 sq ft. house. Is four ton unit big enough? I set the thermostat to 68 and it turned on for about five minutes to maintain the temperature, and is off for another 10 minutes. The humidity is about 45 percent low. Is it the right size? The temperature outside is 85 degree.

I'm in HVAC school rn. Would those books be good now or should I wait until I understand HVAC more?

Do you take into consideration how many times kids go in and out? 🤦‍♂️ I wanted an ICF until I figured it didn’t matter with the amount of time my doors stay open. 🤷‍♂️

Hi Tad I commented a few weeks back about coming to CA to do an install, kinda half joking... but for real now, my buddy and I are building homes on the same property together and local companies don't know anything about mini splits, would love to see if you'd quote us on 2 multi zone mini split setups... What you think?

Does the friction loss change depending on the type of material or shape you use for duct?

HiTad ,good video I would like to become a member I’m a plumber wet side HVAC and expanding into the air side of HVAC Aircondiction side of HVAC in my 2nd year of Jurior College HVAC courses and looking to learn more tips on HVAC

Are u charging fir the Levels?🤷🏻‍♂️

Ralph villela Riverside California

I'm looking it up right now and the manual J goes for around $150 on Amazon. Anybody know where I can get it cheaper let me know

I join from Solomon Islands 🇸🇧

Would you be interested in sizing some equipment and or some duct designing for my company? All new residential homes, 3500 Sq/Ft and below.

Nassau Bahamas

Thank you sir I’m jni

Click bait as an attempt to gain $ via access a pay wall.

I join

Join

Hi

Where I can find those books

just subscribed I am praying you can help me everyone thinks that because I am disabled I have money! But that is so far from the truth!!!!!

Join

Wait a second, you ripped out a perfectly well working 2.5 ton unit for a new 2 ton unit for barely a half-ton (barely at 1100 sq ft)? Please tell me you are kidding me? Was it broken and old and needing replacement? Otherwise, what you did was unethical and not even logical. You could have easily changed the blower speed to 700-800 CFM and use the the existing 2.5 coil for the extra efficiency and increased Seer rating. I am not sure where you are located but a good dehumidifier could have pulled enough air off the system to slow it down too. You did not specify the details of many questions I have now. What design of 14" ducts were installed? Were they square galvanized or duct board 14x14 or 14x10"?, 14" flex ducting or 14" round galvanized duct? Because all three of those would have been fine at a slower blower speed without a change-out. And how many return ducts and how many supply registers and what kind and size were installed in the home? That is like replacing the engine because it is an extra quart of oil was used (drain off a quart and it is good to go). You could have changed the speed of the blower and made sure they had proper large filtration with a 4-5" filter for good flow but that could also have been a point to slow down the CFM's as long as the ESP was within limitations of the unit. But if you said it was a 20 year old unit running R22 and needed recharged or a new Evap coil then fine. But if you changed it out for 6000 Btu's, which is about nominally 4800 Btu's on a good day and probably a pile of latent and a fan running a little fast that could have easily been slowed down to make up for the lack of return air then you could have just made one to two changes then the problem would been solved and you would be the hero with a decent paycheck. You take the sensible and latent cooling and heating figures, do the math and you have exactly what the customer had before you ripped it out. Just removing the latent humidity would have dropped it down plenty especially by slowing down the blower to 700cfm with a wire change and some dip-switch settings. So I really would love to know how old the system was before I tell you that you are a thief and dishonest. Sizing is very important in every system, but ripping a system out over a half ton is ridiculous unless there are ulterior motives or it was flat out broken, old, too expensive to fix or needed a few pounds of R22. Give me something here because otherwise what you did was unethical and could have been retrofitted or adjusted on the blower or fan controls. If you said it was a 4-ton unit, sure I get it, they got ripped off and it needs to be fixed. But you do not specify why you swapped it out in your video and which type of ducting was in place. 14x10 rectangular ducting can easily take 800 CFM, so slowing it to 700 (350cfm per ton) is more than doable by changing a few jumpers or changing out a motor. Please just tell us the reason to change was not just because the unit was barely oversized for an 1100sq ft unit. That is insanity unless it was broken or burning up capacitors like crazy or a bad system board. I will get off your back, if any of those scenarios are in play. But I am not paying to watch the rest of the video. I am heading to bed because it is going to be a busy day, but I look forward to your response. I own an HVAC company and we specialize in Home performance. I have studied the ALL the manuals for years and years and nobody knows it all. I have been to two in-person ACCA trainings with Ed Janowiak and met him personally, not to mention the rest of the speakers during many months and years of training and not to mention reading hundreds of pages of each manual for properly designed systems. I don't think Hank Rutkowski would be very happy, if his books were used in this manner. Please tell me I am making a big deal out of nothing because the unit was dead or dying. I don't know what you fellas charge for an install of a 2-ton York package unit, so I hope they received a good deal. But here, that is big bucks for what sounds to be an unnecessary change-out. RU-vid's finest fella "Anti DIY HVAC" found another unnecessary change-out also this week. Seems like the commission fairy is coming early for Christmas.

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