Natural Conditioned Environment

Are you attempting to obtain energy saving credit for natural ventilation? If so there is some guidance in one of the Appendices in the Advanced Energy Modeling Guide - http://www.usgbc.org/resources/advanced-energy-modeling-leed-technical-manual

I would suggest clarifying the difference between "naturally conditioned" and "naturally ventilated." You can have a mechanically conditioned space that is naturally ventilated, and vice versa. Example: An apartment unit that has a recirculating fan A/C, but no introduced air. This unit is mechanically cooling the air, but is complying with ASHRAE / Code ventilation requirements through operable windows. Yes, to comply with "natural ventilation" it is a ratio of operable window to your floor area (must be at least 4%) AND spaces can't be further than 25' from the window. This would be covered under ASHRAE 62 (chapter 5 - natural ventilation) and calculations are available under the IEQp1 template. If you are doing Natural Conditioning, then this would need to be modeled according to ASHRAE 90.1 Appendix G guidelines.

Very good point Joseph the two are often confused. Unfortunately however Appendix G does not provide any guidance on claiming energy saving credit for natural conditioning.

Yes - good clarification, Marcus. I didn't meant to imply there are savings from the naturally conditioned areas. But for simulating, just make sure you follow the App G guidelines for modeling it correctly.