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Manual D, ​HVAC Design, Duct Layout


Prepared For You.

Manual J, D and S





Professional HVAC Design & Duct Layout Services


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​​Heat-Load USA

ACCA Manual J load calculation - Manual S - Manual J HVAC - Manual J Calculation Service - Heat Load Calculation - Residential Load Calculation - Manual J Services - What is a Manual J - manual j hvac residential load calculation
- load calculation - Manual N - Commercial load calculation = HVAC ENGINEERS - HVAC CONSULTANTS
- ACCA Manual N Commercial load calculation - Manual D - Manual D calculation - Manual J & D Calculations


Quick, Certified  and Economical Manual J, D & S Service

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

Wheather its a small 1,000 sq ft home, an addition or brand new 10,000 sq ft home with eight systems we are here to service you.  

We provide you professional, quality services that you can count on and take to the local building department for your permits. 

Our Manual J, D & S service incudes load calculation and a full duct layout including floor plans, duct sizes, register locations, summary reports and much more. 

Our Fees start at $350 and go up from there. Our normal turnaround is four business days and we offer NEXT-Day services also. 




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

Email us your floor plans:  info@HeatLoadUSA.com



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What We Need In Order to be able to prepare Your Manual J & D?


  • Full address of property including zip code
  • Floor Plan for each floor (including basement if applicable) This can be an architectural drawing in PDF or DWG or hand drawn
  • Measurements of each room or each window size 
  • Measurement of each exterior doors
  • How you want your ducts laid out - Ideally your rough sketch of the ducts
  • Any known insulation levels in the home
  • Location of equipment and ductwork  - Basement, Conditioned space, Attic Garage etc. 
  • If more then one system, we need to know the coverage area and location of each system
  • Your preferred brand of equipment 
  • Preferred SEER rating of AC
  • Preferred efficiency of heating system 
  • Type of heating system: Furnace, heat pump or straight electric coils
  • 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 via PayPal. Pay that invoice and we will deliver your report within 48 hours.



​Ready to Get Started?  


Call/Text Us:   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 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 are 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/heatpump 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 floor 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 an 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: Complete inventory list needed to purchase materials for the job. This is particularly useful for homeowners and DIYers