We use Sefaira in Sketchup for most of our in-house needs, such as early concept modeling and 2030 Challenge reporting. It's a great balance between simplicity and power, and the web interface is nice since you never have to update any software. Unlike most programs that demand input, it will work with a few starter entries, and you can narrow it down as you develop the design.
Typically, our Engineers run the detailed ASHRAE analysis for LEED projects.
As far as integrating with ArchiCAD, it's a little tricky. ArchiCAD exports to Sketchup nicely, but usually with way too much complexity. Sefaira works best with minimal planes. In most cases, we've had to spend time "cleaning up" the model by erasing layers of the walls, or just redrawing the envelope altogether.
I'm working on using the ArchiCAD 20 Graphic Overrides to try to simplify the model enough that the process is easier. I'll report back.
It's one of my long-standing wishes that ArchiCAD provide a Reference-Plane Only view option, perhaps part of the Partial Structure Display. Not only would this be useful for export to Sketchup, but would provide super high-speed 3D model navigation. I think it would be a nice early conceptual design tool as well.
Phoenix, Arizona, USA
ArchiCAD 25 (since 4.5)
Macbook Pro 15" Touchbar OSX 10.15 Core i7 2.9GHz/16GB RAM/Radeon Pro560 4GB