​​Manual J Load Calculation Services   Load Calculation Service  aka heat load services

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Your Satisfaction is our #1 Priority



We have over 30+ years of hands-on HVAC + experience.  And we are certified with 15+ years of service providing HVAC design nationwide.    Next-day delivery is available. 


* 30+ years of HVAC experience

​* Certified by ACCA for Manual J D & S 

* Guaranteed to be approved by your building department

* No lengthy forms for you to fill out

* Simply send us a floor plan & proposed equipment to us



Ready? Call/Text us now:  973-544-6800 

Email:  Info@HeatLoadUSA.com 




What do we need from you?

  • Full address of property including zip code

  • Floor Plan for each floor (including basement if applicable) This can be an architectural drawing in PDF, DWG, or hand-drawn

  • Measurements of each room & windows and doors 

  • If you have a preferred duct layout, please share it with us

  • The make and model number of your HVAC equipment 


Email all these to info@HeatLoadUSA.com  


We will respond right away, and review what you sent us. If we are good, we will send you an invoice. We accept Zelle, credit cards & PayPal.  Pay that invoice and we will deliver your report within four business days.

​Ready to Get Started?  


Call/text us now to get started:   973-544-6800

Email us your floor plans:  info@HeatLoadUSA.com


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​​​​Why Heat Load USA?


We have combined over 80 years of HVAC design, install and troubleshooting.  Everything we do conforms to the national ACCA 8th edition and your local codes.  The software we use is Wrightsoft - the best in the industry -  which means the reports you get are also the most accurate, robust, and most professional.  Nothing less.

We are certified by ACCA in Quality HVAC design so you can rest assured that all of our Manual J, D & S is done to comply with national ACCA Manual J, D & S standards. 

Our HVAC load calculation service reports include all of the following sections:  

  • Full duct design and duct layout

  • ACCA Manual D Calculation; HVAC Design

  • Full duct sizing showing each trunk, branch, materials, and size  (you can customize and tell us in advance)

  • Complete loads and CFM for each room and vent

  • ACCA Short and Long J-Manuals and J-Forms

  • Equipment selection (you tell us the brand and efficiency and we will include the furnace/heat pump coil and condenser on the report

  • Equipment Manual -S report and ACCA Residential Examiner Review Form

  • Detailed friction rate and static pressure (loss) chart

  • Complete duct materials and duct lengths

  • Detailed building analysis and much more

  • HVAC Design, HVAC Duct Design Manual J and D, HVAC System Design, 


Call/Text Us Now: 973-544-6800

Email: Info@HeatLoadUSA.com


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What Is Manual D? 


​​​Manual D is essentially a sizing exercise for ductwork.  Ductwork must be sized appropriately in order for the whole house to be able to be heated and cooled uniformly.  Poor or no duct design results in rooms and floors that are too hot and too cold. 

The size of the home,  zip code, elevation, summer high & winter low temperatures, exposure to southern and western sun, room function, amount of windows, square feet of a room, which floor it is on, and summer humidity levels  -  all play a function in determining the size and amount of ducts needed for a room. 

There is a difference in HVAC design.  For a more thorough HVAC design, we go that extra step.  We design our system so that they run quietly, efficiently, and reliably for years to come.  

A good and properly thought out Manual D is a key component to achieving homeowner comfort, safety, and efficiency.  Our Manual D designs provide you the following:



  • Load calculations for each room
  • CFM (volume of air) needed for each room
  • Size of furnace, heat pump, AC required to satisfy the home
  • Equipment Part numbers for Furnace, Condenser, Coils and/or heat pump
  • Location of central heating/cooling equipment
  • Full duct layout showing each individual trunk, branch, register, vent, and all ducts for each zone
  • Short and Long J1 Forms
  •  Summary load forms
  • List of trunks and branches showing length and materials needed
  • Plus more…..


Optional: Parts list for all your duct layout needs in order to be able to purchase materials for the job. This is for more experienced installers. 


We are licensed and certified to provide Manual J, D & S services nationwide.  We are professional HVAC designers and we have provided these HVAC duct design services since 2009 and have completed literally tens of thousands of load calculations and HVAC designs all over the US.   

Whether it's a small 1,000 sq ft home, an addition, or a brand new 10,000 sq ft home with eight systems we are here to service you. Our HVAC Ductwork Design services are guaranteed to be approved by your local building department. 

While many can create Manual D reports, not all Manual D reports are created equal.  Our residential HVAC Design service re comprehensive and designed for maximum user comfort and system transparency.  Our reports are comprehensive and exhaustive and include load calculation and a full duct layout including floor plans, duct sizes, register locations, summary reports, static and friction rate charts, AED, building analysis and Manual J long and short form, and much more! 

We provide you with professional, quality services that you can count on and take to the local building department for your permits. See the list below of what we need from you.  

Our Fees start at $490. Pricing will vary based on the time it takes us to do your full set of plans and reports.  Our normal turnaround is five business days and we offer NEXT-Day services also.  



Professional HVAC Design & Duct Layout Services


973-544-6800   or email us:  Info@HeatLoadUSA.com


Call us:  973-544-6800 


Email us:  Info@HeatLoadUSA.com

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