Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The heat pump in the image was designed to work only with fresh air. The red line doesn't make any sense to Design Builder because the Exhaust must be connected to an AHU, not to a heat pump - this is why you can't connect them.
What you want might work with an API that uses a script - it involves some coding. You can force Energy Plus to use the room data (temperature, humidity etc.) instead of the weather file.
