Rating System

LEED BD+C: New Construction, LEED BD+C: New Construction, LEED BD+C: Schools, LEED BD+C: Schools, LEED BD+C: Core and Shell, LEED BD+C: Core and Shell

Rating System Version

v2 - LEED 2.2, v3 - LEED 2009, v2 - Schools 2007, v3 - LEED 2009, v2 - LEED 2.0, v3 - LEED 2009

Inquiry

Per ASHRAE 90.1 Appendix G, in order to model an addition excluding the existing building, the HVAC system must be completely separate. Is it acceptable to model the addition separately if it shares steam to hot water heat exchangers with the existing building, but the air handling system is completely independent?