How to perform a quick load calculation 

Thank you for the most complete, most clearly presented, most thorough, most succinct, most helpful video on Manual J calculations on You Tube. I have watched so many presentations by so many so-called "experts" (including ACCA board members and authors associated with ACCA). Not a single one of those videos completely covers the process. All of them leave out some of the essential, necessary steps. None of them clearly provides enough specifics to actually do the Manual J analysis required by most jurisdictions for a new system install. Many of the so-called "experts" and "trainers" ramble on about irrelevant or personal information for the better part of 1 or 2 hours Typically, the presenters provide just enough information to get your interest and attention so that you will buy their book, pay for their services, or purchase parts or tools from their sponsors. Thanks again!

I loved using those load calc tables, we were also an Airtime 500 contractor. Those calculations are the job so much easier when doing loads.

Easy video, I am jsut starting in the HVACR field so this is good info

Great explanation!! Thanks for breaking this down into such an easy to understand way.

Excellent tutorial, thanks for sharing this!

Thanks for sharing.This will greatly bless our up coming business fulltime.

Dope thanks for sharing

Very helpful thanks 🙏

I suggested to pay a company to get the AC load calculations rather to install based to 1 ton every 400 sf. I have installed a 3.5 ton AC to a 1570 sf house and the size was wrong. All the AC contractor agreed the size was between 3 and 3.5 ton, but all of them were wrong. The AC turned on and off quick without completing the cycle, and not removing the humidity and not cooling, and therefore creating mold. A professional calculations done by engineering company specializing on this, shows that the correct size was 2 ton., could go up to 10% high in size. The AC was replaced, and the problem resolved.

Have 2 questions. How do you calculate gains from ductwork. And second: when it says number of people: I have a hall to calculate with about 60 people and 1 bathroom. Do I calculate only 1 bathroom or calculate 60 people?

That's a cool pen.

Thank you for this bro

Hello, thank you for your explaining. Actually, I did understand how we get the total BTU/h heat gain. Can you please show me how we calculate it?

I'd love to use this accu-size sheet but it only allows a few specific construction parameters. Doesn't work for R40 walls, or R-60 ceiling or triple glazed windows with U factor 0f 0.15. It could be useful if it had adaptable formulas rather than specific multipliers for specific construction only.

Can you help me I am wanting to find CFM’s for rooms once I know the Btu/h heating and cooling loads. I have the Manual J8AE spread sheet and the CFM outputs seem high to me and I wanted to see other calculations. I tried the Sensible Heat Formula of CFM = Sensible Btuh / 1.1 * Delta T But when I input those numbers I get higher CFM needed in areas that have lower Btuh heat loss/gain. Here is my example Home is in Laguna Beach California The area labeled 1st Flr Master Bedroom has a heat loss of 9138 Btuh and a Heat Gain of 4807 Btuh Manual J8AE want to provide 299 cfm for heating and less air (244 cfm) for cooling If I do the sensible heat formula CFM = Sensible Btuh / 1.1 x ∆ T , I am using 29 ∆ T for heating and 10 ∆ T for cooling I get 286 cfm for heating and more air (437 cfm) for cooling. This does not make sense to me with needing more cfm with less of a Btuh load. Can you show me where I am thrown off?

Hello, i like your video. thanks for taking the time publish it. i have one question? you said that this worksheet is only for the part of US where you live in, but what does it have to be changed in order to use it in other parts or in other countries?

Oops, at 02:00 you calculate 33 sq ft, however you entered 8 when it should have been 18, meaning it should been 43 square feet.

The formula is: 400 sf pet ton - for commercial and 500 sf per ton - for residential installations (8 ft ceiling).

Thank you for it!

I love the explanation but I would love to know where they are getting the multiplier factor so I can convert to my region.

Many thanks for sharing that with us. I can't help but wonder, how exactly you developed this sheet. I mean how you come up with multiplied numbers?

Thank You

Nice video where can I go to get a worksheet like the one you have.

Great video. If the average degree day for heating changes from 0 in your example to 25 then would the multipliers change also?

Suscribed, good information

Can I pay you to do a load calculation for me? Also how do you determine the region?

Good

Awesome Video. I'm very interested in using this form. Where did this form come from?

Where do u get the form

Where can I find the load sheets like you filled out

Does anyone have a form, like the one in the video, for me to fill out but for Florida. My county building department needs energy calculations for our house, and I will be submitting it as owner builder, so we don’t need a contractor.

If I have gymnasium and I want to calculate cooling capacity ,the area is 700m^2

here is the link for the work sheet i use www.askexpertexpress.com/manual-j-heat-loss-heat-gain-block-calculation-work-sheet/?preview=true&preview_id=1437&preview_nonce=dad3624c86

For exterior heat loss, does it matter if there are rooms? Would you have a different total or heat loss per room?

Hello. I currently have a 40amp sub panel and need to accommodate an extra 60amps in it. In the 40amp sub panel there is a 15 amp and a 30amp. What size breaker do I need in the main?

Can you please upload the link for the sheet you are using for writing all the values ?

For retrofits, Use coolcalc.com and make sure your ductwork will support the cfm. 10 years doing calcs, all in Denver, only one complaint early on (wtf 8k sq ft house, loads get complicated with 6 and 1/2 systems) make a checklist with all required measurements and then xfer the info. It takes me one hour for measurements and another hour for completing the calc...+ drive time... All ways slightly oversize and design your sales programs to sell two stage equipment. Your fucking welcome kiddos! Best of luck!

I'm in the Houston ,Tx area. Can you make one for this area, or do you know where I can get one just like the one you are showing?

HOW DID YOU GET 70,000 BTU and decided to get a 2 ton unit furnace? Thanks . . .

How did he get the 44431 from

What do you suggest if you have a bilevel or tri level house (that has a garage and basement)? Thanks.

Almost no HVAC contractor does these calculations anymore, they pulling numbers out of thin air now.

Regards friend. Great video. I'm designing a precision system for a data center, I have not experience working with data center precision cooling just with confort, so my questions are: do you have an example that you could share with me of load estimation for data centers? is the calculation procedure different from the confort loads? How do I know the needed power for a precision cooling system in a data center?. Thanks in advance for your help.

Is there any way I can get a sheet like yours for alabama. It look easier? Thanks

What would be your HTM for roll up metal shop doors? can't find in Manual J

Hello, are you still required to complete this for the exam in order to be certified? Thanks

I guarantee you you have 10 different contractors do that same worksheet on that home and you have 10 different answers. 2 Ton 800 cfm on 1400 Sq plus ft house good luck with that. Also most new hi efficient units will throttle up and down with the load. So what do that tell you a variable speed unit will cover the range from 24000 btu to 3.5 tons. You still comply with that bullshit that units to big and you got enough cooling on the real hot days to whistle Dixie not even break sweat and still keep the energy consumption down. Most house have 12 to 15 supply grills. You put that many on a 2 ton there want be squat of air coming out the vents

What’s an app that can do this? I’m a salesman not a mathematician 😅😅

Giving a load calculation on a 40-60 home car garage with 16 ft ceilings, don't know what BTU's to add for a hot car but i assume it could be at least 10,000 BTU's per hr.

Hey can u send me the link to get this load calulation worksheets

good video, but how did you determine the final size of the furnace a/v unit? you did all the calculations but left out how you decided on a 2 ton unit. why? how? what was the purpose of all the calculations if you wer just gonna say, basically a 2 ton unit at the end. WTF

Where can I find that paper

Can u share PDF of the sheet

it probably won't hurt a bit to add 25% for people who keep there A/C on 67 degrees especially in extreme temps.

Can you create a sheet for Wilmington NC?

can you share the sight to download form?

Where exactly did you get that form?

2 ton seems small for a 1404 square foot home I know thats the math but on a 95 degree day that’s no going to work

What are we cavemen

It will not let me Access the file you put on bottom? The block one?

At the end why did you say you need a 2 Ton system? how did you calculate that for 61000 BTU? Shouldn't it be 5 Tons?

I want in Telugu electrical videos

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