Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I would personally use the default space types and HVAC system templates in OpenStudio to do this type of analysis. You could also use something like Sefaira Systems, which is a new tool developed explicitly for early design HVAC system exploration. The key is explaining that your results have significant assumptions. If the client is interested in reducing that uncertainty, I think that is the perfect time to discuss energy modeling with them.
