- Application – Whether the space is a restaurant, office space, retail outlet or grocery store
- Building Type – Is the space a warehouse, a single or multi-story building or some other construction type?
- Square Footage – How big is the space that is going to be air conditioned or an amount of heat added to it?
- HVAC Equipment Type – Is the building going to have gas heat or electric heat? Will it be an air cooled or water cooled system?
But wait, there’s more! Manual N also takes all the building construction materials into the equation too. Everything is looked at, and it all adds up. Things like:
- What are the outside walls are made of?
- What are the inside walls are made of?
- What is the level of insulation between the walls? (measured in “R” value.)
- What are the floors are made of?
- What kind of windows are installed?
- What is the roof made of?
- How many people are in the space?
- How many, and what types of lights, electronics and plants are present? Yes, even plants add up!
Once all of the above items are factored into a Manual N calculator and the calculation is done correctly, the program will tell us what the heating and cooling BTU requirement is for the building.
The actual calculation is very involved and labor intensive. While when Manual N first came out it was done by hand, now the HVAC industry uses one of several load calculation programs to do all of the many complex calculations and expedite the process. That said, the time involved to do a comprehensive load calculation for an entire office building can still take the better part of a day!
Based on that we are trying to size the load for a commercial HVAC system, we can see that 600 square feet to the ton is not the correct calculation we should be using. Instead, depending on the application, we could be between 50 to 400 square foot to the ton – quite a difference!
This is by far the most accurate of all the various methods for determining what size a commercial HVAC system should be.
The best way to know for sure if your building has the correct equipment installed, have an experienced HVAC technician perform an evaluation on your heating and cooling equipment. Carolina Comfort offers a full suite of commercial services including maintenance, repairs and replacements.
It doesn’t matter what time of day it is, or even what day it is. When your AC unit needs repairs right now, then our emergency HVAC technicians are ready 24/7 to help. If you have an AC emergency that just can’t wait, then call us to get the best emergency service in South Carolina. For more information, please call us at 803-794-5526