SIngle button to change from IP to SI in a drawing.
I've been recommened others in Korea to use your HVAC program. But they don't try to use it. Because it supports only Imperical unit(IU).
I've been using it by changing CAD design file from SI to IU, calculate, change CAD file and report from IU to SI. Why? Because your software is very very good except this.
If you add SI unit in your program, I think the sales in the world will skyrocket.
We currently can label ducts in SI units, using CM or MM. You can also label airflow in LPS.
All the calculations are done in imperial units and ducts are sized to even inches. It is just the labels that we can currently change.
WID EL-AMER commented
VERY IMPORTANT TO ALSO HAVE SI UNITS FOR DUCT ANNOTATIONS AND IP ANNOTATIONS FOR AIR FLOW CFM