Manual J (Load Calculation) Overview

Free eBook: 'How to Pass Load Calcs for Permits’

This is a fast-paced, recorded webinar (12/31/20) where Chris covers the basics of ACCA Manual J and elements of a Site Survey.

1. I’m too busy , What does this mean to me?
2. (4) Details that impact your Heat Loss & Heat Gain the most
3. Sample Manual J Reports
4. Where to find training that will increase your System Design Accuracy & Confidence

Interested in more? Check out our events page for upcoming virtual and in-person training

[RateItGreen]

Good information- thanks for sharing this. The load is constantly changing throughout the day so variable speed is the key.

[AttainableHome]

This is really excellent, thanks so much for doing this. Learned a ton (no pun intended)

[mainormoscoso]

Great information, thanks for the tip on CoolCalc to do calculations.

[caseyjarvis]

Thank you for this video interested in your guide and and advice on studying for the hvac license exam

[gregburns]

Semper Fi brother. Just found you. I am a RNC installer looking to move into design and layout. I can appreciate your attention to detail when it comes to correct installation and following code. Would appreciate any help in making my work better, making my installers better and making customers happy.

[ranzerbinz]

Great Job Chris! Loved the seminar. This information was incredibly useful. I love using these videos as a supplement in my classroom instruction. Thanks man! Hope you're doing well?

[jamesemanuel]

Well done Chris. Just getting through the final steps of starting an LLC. Had some schooling and mostly commercial service experience (little bit of construction experience). Wanna run this business right and not sq ft / ton method. Thanks for putting this out there.

[a.t.]

Hi Chris. Thank you so much for all this excellent information. I'm having a very hard time finding anyone explain how to input vaulted ceilings into the various manual J software. Is it as simple as figuring out the equivalent air volume as if the ceiling was flat and inputting that calculated ceiling height? And then inputting the actual ceiling square footage which will be greater than the floor square footage? Also, is there a better way on placement of registers on such ceilings - like one at the very top and one lower closer to the wall, rather than just having one at the lower location? If you could help by sharing your thoughts, that would be so helpful and appreciated.

[itamarnavarrete]

Hi Chris, i got a question about manual j, how apply 1800 sqft into table 7D AE BASE CASE LATENT GAIN if square feet goin in 500, chart 1000-1500-2000-2500-3000 max

[CJRoe-ssbt]

cool calc always seems off. just did one block and room by room for the same new construction house. got different numbers for each. Just less than 20kbtuh for cooling and 49.5kbtuh for heating block, and a total of 28.8kbtuh for cooling and 39.7kbtuh for heating room by room. If all the info I'm putting in to any software is a guess (new construction), it seems like taking rule of thumb guess would be just as (in)accurate. WTF over. Super frustrating, buy all the programs, use the free ones, do the training and watch the videos. Its all a freaking guess!!!

[flyonbyya]

I Hate to sound profoundly ignorant, but I’ve heard from a couple guys that have their Michigan mechanical license say it’s either suggested or some sort of standard procedure to add 20% to the calc.
That true, false or it’s more complicated?

[asfanjagirdar]

Hello Sir,
I have confusion while doing the load calculation for the Unfinished and finished basements about when to include them in the calculation. Please answer.

[jeromeearly]

My house is 2500 square ft. The size of my air conditioning unit is 3 1/2 ton. The house was built in 1988. I don’t consider 75 to be cool. What size unit do I need to be able to stay at 70 when its 95 outside.

[Anunakipower]

Where to purchase the software? Thanks!

[carlospires]

What the best software load calculation, for you?

[Zimmerdf]

We have an old Farm house completely gutted ready for HVAC. I have been asking HVAC companies if they do load calcs and most don't. The last one I asked if they would do a Manual J and they said yes. I asked how they could do an accurate Manual J before spray foam and Aero-Barrier and he said they use an estimate method. Sounds a whole lot like Manual E to me...
Can you complete a Manual J before insulation and air seal?

[samersarah]

I’m enjoyed in this informative lecture Chris. I’m graduate from hvacr school so what’s manual you’re advice me to go with it? I want to start in residential work. Thanks.

[georgedvojacki]

How do I get a copy of your PowerPoint presentation.

[trent]

Well done! Well presented. Doing master suite/garage addition extreme north California. Im old school extensive engring background started w autocad R12 in high school, hell, backed into a C10 license working in telecom - really having my eyes opened. 14 sheets of design plans I drafted, thought I was going to impress the guys down at the county for my little addition project- hah! Title 24 ... Wha? Manual J? errrr... Sprinklers? INSIDE the house?? Just thnkn where does it end? we will be counting and accounting for and taxed on, sheets used in the bathroom next. Great job here though, I will be aware of and able to do the load calcs based on your vids. But when the code/gov is telling you when you are comfortable, how bright your lights can be, how many gallons you can flush, and what equipment you can put in your own house..? Its a free country? not so much... Shweew, I feel better, lol. Great job, thank you for your service.

[balfretsoriano]

Thanks and I want to ask you about where to get these books for me to continue learning all about it if you can send me the information about it thank you again 😊