Certified Duct Leakage testing, Duct Blaster testing, Blower Door testing, Manual J heat load calculations, Energy Star certification, EnergySmart, ResCheck, BuildSmart and 2009/2012 International Energy Conservation Code Compliance. Serving Greenville SC, Spartanburg SC, Columbia, SC, Anderson SC Charleston SC and Myrtle Beach areas of South Carolina.





ACCA (Air Conditioning Contractors of America) Developed the Manual J program for HVAC contractors due in great part to the inaccuracies of the sizing of HVAC equipment in most homes. It's been the habit of most HVAC Contractors to size a home based on square footage or what was installed in the home previously. Also, oversizing of the HVAC equipment is fairly rampant because contractors want to hedge their bets and not take a chance that the system won't provide enough cooling.

Commonly referred to as a heat load calculation, it is a necessary calculation in all cases to properly size an HVAC system for that particular home. The heat load calculation takes into account the location of the home, naturally a home in Cleveland, Ohio would have different requirements to heat and cool the home than a home in Greenville, SC.

Now, with the new energy codes in particular the 2009 IECC (International Energy Conservation Codes) and the 2012 IECC, that have been adopted by most all of the states and the Energy Star program by the EPA, ACCA Manual J heat load calculations, as well as Manual D and Manual S calculations are required. Manual J heat load calculations take into account such things as:




  • Orientation of the home
  • Number and type of windows
  • Type of walls and foundation
  • Insulation types and amounts
  • Roof Types and pitch
  • The average year round temperatures of the region of the country




​ACCA Manual J, D and S

Greenville, Spartanburg, Anderson, South Carolina

All of this is worthless if:

It doesn't do a bit of good if you follow all of the Manual J, D or S sizing procedures and calculations. If the duct work isn't properly sealed you've done all of that in vain. The Dept. of Energy states that "10% - 30% of the total airflow of the average US home is lost through leaky or poorly installed duct work".

You want the air , heating and cooling to be delivered to the living space, not to the attic or crawlspace.

That's why a duct leakage test or commonly referred to as a duct blaster test is a requirement of the 2009 and 2012 Energy Codes and code officials in most counties and municipalities require verification of the tightness (or leakiness). The Energy Star program also requires this verification of duct tightness.

All About Energy provides duct leakage or Duct Blaster testing in the Greenville, Spartanburg and Anderson region of Upstate South Carolina.


Call us... 864-640-9451 for all of your code compliance and duct leakage testing needs.

ALL ABOUT ENERGY                     864-640-9451

It makes perfect sense. An ACCA Manual J calculation in the Greenville, Spartanburg and Anderson region of South Carolina would take into account the that this region is hotter in the summertime than a region in the north, has a different insulation requirement and would in most likliehood give an equipment size larger than a northern region. A heat load calculation would give a higher heating requirement for a northern home than one in the south.


Also, local building codes are requiring these ACCA heat load calculations on all new construction, in great part to the realization that in the past HVAC equipment was not sized correctly.

Unfortunately also, a lot of contractors are doing what is known as a "block" Manual J heat load calculation. That is, they are doing a Manual J calculation based on the overall size of the home. This is not the correct way to do a Manual J, because it treats the house as one big room, not taking into the account such things as the effect the sun may have on a particular room in the house, different appliance loads etc. Makes sense that a room such as a kitchen where ovens and appliances contribute to the heating and cooling requirement would have a different load than a den, office or bedroom for example. The only truly correct way to size equipment for a home is with a "Room by Room" ACCA Manual J Heat Load calculation.

In addition there are two other aspects of correctly sizing the HVAC system in the home. They are the ACCA Manual D and ACCA Manual S.

ACCA Manual S

ACCA Manual S Equipment Selection


​The ACCA Manual S is Equipment Selection portion of the correct sizing of HVAC equipment. The Manual S procedure takes into account the Manual J heat load calculation and the Manual D duct sizing calculation to make sure that the correct equipment is selected to provide the proper. heating and cooling for that particular home. The Manual S procedure takes into account Manufacturer's data for such equipment as heat pumps, air conditioners and gas furnaces to ensure that the equipment chosen meets the design criteria developed using the Manual J and D calculations.

A good example would be the heating requirements for a 2000 sq. ft house in the Greenville/Spartanburg/Anderson area of South Carolina would be different from the heating requirement in Cleveland, Ohio. So even though the house are the same area and volume

​ a 3 ton heat pump may provide the necessary heating and cooling in Greenville, but would be undersized and not capable to provide the heating needs of a house in the north.

ACCA Manual D

​ACCA Manual D Duct Calculation and Sizing


Just as important as a Manual J heat load calculation is the correct sizing of the duct work. This is achieved by performing a Manual D duct sizing calculation. Again it makes sense that you would want the delivery portion (duct work) of the HVAC system to be sized correctly so that the correct amount of heating and cooling is being delivered to the individual areas of the home. It does no good to have a air delivery system that restricts or doesn't provide enough airflow to provide comfort to each and every room in the home. Restrictions in the airflow in an HVAC system also has great effect on the life of an HVAC system by making the system work harder to provide that airflow, putting a strain on the motors and components that make up the system. That's why in addition to an ACCA Manual J heat load calculation, the Manual D Duct size calculation is an important part of correct design of that system, the comfort of the occupants and the efficiency of the system.


So, to provide the comfort, efficiency of the home and the health and well-being of the occupants, as well as the health of the structure itself Manual J, D and S calculations are the proper way to go.


Contact Us for all of your Manual J, D or S load calculations, we're here to help. 

All About Energy... 864-640-9451

Tel: +1.8646409451

96 Grist Mill Dr, HendersonvilleNC 28739, USA

Serving the Charlotte NC, Raleigh/Durham NC, Chapel Hill, Cary NC, Asheville and Western NC regions for Certified Code Compliance, EnergyStar certifications,Blower Door Testing, Duct leakage and Duct Blaster testing, Energy Certificates, BuildSmart, ResCheck, EnergySmart certifications, ACCA Manual J, D, and S calculations.