Quick, Certified, and Accurate Manual D Service


Call us today to discuss your needs:  973-544-6800



  • Your Satisfaction is our #1 priority
  • Next Day Service is available 
  • We service all of the USA
  • Simply send us your floor plans & proposed equipment
  • Over 30-years HVAC experience
  • Certified by ACCA for Manual J and D 
  • Pricing starts at $490.  Call us for a quote for your project


Ready? Send us your floor plan to Info@HeatLoadUSA.com


Call/text us for more information:  973-544-6800



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What do we need in order to be able to prepare your Manual J & D?


  • Address of property 
  • 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 window in each room  
  • Measurements of each exterior door
  • Your preferred duct layout (if you have one)
  • R-value of insulation in the walls and attic 
  • Location of equipment and ductwork  - Basement, Conditioned space, Attic Garage, etc.  
  • If more than one system, we need to know the coverage area and location of each system
  • Your preferred brand of equipment 
  • The 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



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We are certified to provide Manual J & D calculation 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 including our commercial load calculation - Manual N.  


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 ready to be of service to you. 


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


Our Manual J & D service includes load calculation and a full duct layout including floor plans, duct sizes, register locations, static pressure, friction rate, Manual S certification, equipment, detailed summary reports, and much more. 


Our Fees start at $395 with a normal turnaround of four business days. NEXT-Day is available.  


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


Email us your floor plans:  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 four business days.  Expedited next-day service is available. 





























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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…..


Next Steps

Call or TEXT us:  973-544-6800


Manual J & D Reports

HVAC Ductwork Design


Yes serve ALL of the USA



Call or text us now:  973-544-6800   


email us:  info@HeatLoadUSA.com

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