From beginners to seasoned pro's, you will always feel like you could have done it faster. Let's say you have a ~20,000sf Office with perimeter individual offices and a central cubby-farm, with the typical breakroom and toilets/janitor closet. Typically these would be a shutoff type VAV system fed from a single VAV air handler (no energy recovery, just economizer). Even if you've never done one please give estimated time: 1. Guesstimate or Modeled 2. Hours spent 3. Climate Zone 4. Did you have to follow ASHRAE 90.1 Appendix G 5. Scale of 1-10 would you consider this task easy 1 or hard 10 6. Modeling software you'd use. Thanks for playing.