How to perform a quick load calculation

Raleigh, Durham, chapel hill, garner, apex, holly springs, and wake forest premier plumbing heating and air conditioning contractor. we are a family owned company with a proud tradition of being the best at what we do since 1922. we always use the highest quality parts and we provide the best quality service. Give us a call and find out why 99% of our customers recommend us to their friends

[@martysomoco]

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!

[@charlton5787]

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.

[@stlwrkr68]

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

[@tedjohnson64]

Excellent tutorial, thanks for sharing this!

[@eagletek1]

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

[@Askexpertexpress]

your welcome

[@demondude1000]

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

[@andrescientos]

That's a cool pen.

[@pabloantonio9507]

Dope thanks for sharing

[@humbertodiaz3137]

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?

[@unibrowmonsterattack5527]

Thank you for it!

[@Yo_Jon]

Thank you for this bro

[@lucdumouchel3864]

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?

[@jeffreywilliams3944]

Thank You

[@heroknaderi]

Very helpful thanks 🙏

[@Askexpertexpress]

Glad it was helpful!

[@rokiyayo6633]

Suscribed, good information

[@Alhabshan_m]

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?

[@adambernard3196]

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

[@jayprojects5176]

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

[@bklynwam]

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

[@ManuelSanchez-ov2ed]

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?

[@joshuacassino7297]

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?

[@IA-ge1et]

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?

[@Askexpertexpress]

+Al-Salama Ibraheem this is used by taking standard block load multipliers from government Publications

[@6barry66]

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

[@sprinter9166]

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

[@Alien-MAC]

if the home owner has a bunch of electronics, fridges, and other heat producing items, could u add a little on the top?

[@williamprothro2030]

Where can I find the load sheets like you filled out

[@mohibnasir]

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

[@crownjewels101]

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

[@Askexpertexpress]

crownjewels101 yes they are different the multipliers are found in the manual j guide every area has a different average temp that is listed in the guide as well

[@dennmillsch]

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.

[@Askexpertexpress]

If you have other than a standard home a quick load calculation is not for you. I recommend you use the wright soft manual J program to correctly determine the exact BTU load requirements.

[@user-el9kp7yk2o]

Good

[@SkipsTransAm2002]

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

[@ashliemiller528]

How did he get the 44431 from

[@spojj064]

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.

[@islamfathi2184]

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

[@notanaccidentorg]

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

[@dennmillsch]

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.

[@simsource5017]

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

[@edithnogueira7899]

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.

[@scubastevoo8404]

who taught you that? the only thing close would be 400 CFM per 1 TON. not sq. ft.

[@KenTraining]

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?

[@tonkie10]

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.

[@Askexpertexpress]

+Jose julian we have designed hundreds of cooling systems for data center you have to use a commercial heat load calculation and find out what the manufacturing specs of the computers or other equipment located within the space is going to require as far as the BTU load for example Jose a computer puts off 3000 BTUs per hour x 1000 computers = 300k btu load. You also have to consider if it is an up Flow Design meaning that it's coming floor through the system your humidity will have to be controlled to prevent damaging the computers. You also have to look at static pressure within the room. Also take into effect static pressure on duct design

[@peerod673]

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

[@Seabass1206]

you need to find an Resistance value table for your building materials and also find your areas outdoor design temp

[@amokoikaw1]

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

[@juliejanczak715]

Where do u get the form

[@jonathanavila9699]

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

[@sprinter9166]

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.

[@rahulneela8554]

Can u share PDF of the sheet

[@billyrayboo7315]

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

[@MrFrostynugs420]

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!

[@butlershvac4637]

Can you create a sheet for Wilmington NC?

[@theworshipdrummern8]

Butlers HVAC check with your local offices. He didn’t “create” this. It’s an NEC type thing look online.

[@gund89123]

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

[@grindtime76sanchez20]

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

[@bobh1414]

Where exactly did you get that form?

[@srercrcr]

The form is in Google Images

[@eagletek1]

can you share the sight to download form?

[@Askexpertexpress]

www.acca.org/standards/acca-speed-sheets/ this is a link for the acca spread sheet I will be posting a copy of the block load sheet I use on our web site soon under the blog section

[@Askexpertexpress]

here is the link to 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

[@Askexpertexpress]

here is the correct link www.askexpertexpress.com/manual-j-heat-loss-heat-gain-block-calculation-work-sheet/

[@chrisej7586]

Expert Express plumbing heating and air conditioning b

[@SombraLocs]

@@Askexpertexpress Did you guys take it down?

[@aidanheidel3837]

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

[@One000Suns]

Late response but he determined it would be a 2 ton AC unit by adding up all the Heat Gain numbers (left side of paper). He calculated 24773 BTUs of heat gain (bottom of page @5:47) and that is about a 2 ton AC unit. The right side of the paper is for heat loss and that relates to heating.

[@srercrcr]

Divide the 24773 BTU by 12000 = 2 ton.

[@mayaroable]

2400 btu heat gain = 1200 btu per ton = 2ton of cooling. 61000 btu of heat loss÷.80 80% =a 80000 btu input furnace

[@Askexpertexpress]

[@1984juant]

Hey i cant find that sheet i just get the spreadsheet of acca which i dont really like too much..

[@1984juant]

Never mind i found it in your blog. But how can i get the one from my region??

[@Askexpertexpress]

What region are you in. I will make one for your region and posted on my website

[@juantapia8079]

Im from south texas. I have house for this weekb i would like to try it. Thanks

[@Askexpertexpress]

you can download the app "quick load" on the app store it works great and you can set the temps for your area

[@peterkalinin3775]

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

[@SkipsTransAm2002]

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

[@Askexpertexpress]

sorry here is the correct link www.askexpertexpress.com/manual-j-heat-loss-heat-gain-block-calculation-work-sheet/

[@Askexpertexpress]

Expert Express plumbing heating and air conditioning click on the word heat for the pdf file

[@Askexpertexpress]

Expert Express plumbing heating and air conditioning sorry heat loss

[@SkipsTransAm2002]

Thanks for your help! Is there any way I could get one for Alabama? I think it calls for a heat gain day of 93 and heat loss 23. Thanks again and great videos.

[@buragaprasadbabu9226]

I want in Telugu electrical videos

[@HiddenTruthExposed]

What are we cavemen

[@cyrusIIIII]

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?

[@One000Suns]

The number 61000 was for "heat loss" so it applies to heater sizing. The left side of his form was for calculating "heat gain." This is for cooling and the number he calculated was around 24000 btu (bottom of left side form).

[@cyrusIIIII]

Thank you

[@mariobenoit7486]

So you divide number by 12 to get the tonage?

[@srercrcr]

divide by 12000. One ton = 12000 BTU

[@sprinter9166]

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

[@MOPARMANIATEXAS]

EXCEPT that over sized will cause Mold.

[@alanhumphrey4198]

What about in Texas??😊😊

[@hvacguy542]

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

[@mayaroable]

House is 1134 sq ft

[@Askexpertexpress]

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

[@Barnekkid]

+Expert Express plumbing heating and air conditioning When I try to look at this I get a message saying I don't have permission to look at drafts. Is there another source?

[@Askexpertexpress]

we are fixing the problem and will have it back up soon

[@MR-nl8xr]

Expert Express plumbing heating and air conditioning. Problem still there.

[@jayarellano122]

anu daw

[@byrantilford923]

Where can I find that paper