More and more state codes are requiring room-by-room Manual-J load calculations as part of the permitting and inspection process. Virginia, North Carolina, South Carolina, Georgia, Florida, and beyond, all recognize Manual-J as being the best way to properly calculate the heating and cooling load of a residential building.
Whether you like it or not, the codes are making you do these calculations.
There are two routes you can take:
- Do it because they say so. Give it to them, so they get off of your back. Never look at the reports again.
- Satisfy the code officials by giving them the reports. Then, use these reports to select the right-sized machinery, and then use this data to size the ductwork for optimum performance. You’ll most likely save money (or have higher margins) during this process, by installing smaller machinery and less ductwork.
PLEASE make sure you take advantage of the information a quality Manual-J provides! Don’t just set it aside and ignore the valuable information in the reports!
A common question I hear is, “Is there such thing as a bad Manual-J calculation?”
YES. There are many inputs that go into a Manual-J calculation that will affect the results. There are building envelope details, infiltration, ductwork details, ventilation, internal gains, window overhangs, kneewalls, garages, interior/exterior design conditions, etc. All of these details must be properly documented within the Manual-J, so that you’re getting an accurate picture of what your building requires.
Hire us to do your Manual-J’s.
We provide super-fast turn around times and extremely accurate calculation reports to HVAC contractors, architects, energy consultants, and builders nation-wide. Get started by filling out our online request form. And, we’ll get back to you ASAP.