The project undergoing the LEED process is an 847,218-sf warehouse with 22,776-sf of support offices in the same building. Eight (8) high-efficiency gas-fired rooftop units are proposed for providing heat to the warehouse space to maintain a 54-degree setpoint during the occupied hours of operation and a 50-degree setpoint during unoccupied hours (only heating provided to warehouse). The office area is proposed to be conditioned with high-efficiency gas-fired heating and DX cooling rooftop units serving separate interior and exterior spaces. The heating system for the warehouse is only designed to maintain setpoints intended to protect fire suppression sprinkler piping and other domestic piping systems from freezing during the winter. The heating and cooling system for the office area is designed to maintain temperature set points during the summer and winter for human comfort. The proposed control sequence for the warehouse rooftop units is to start the units two at a time with a dead-band of 3 degrees Fahrenheit - such that if the space temperature set point during winter is not maintained through the use of two units, two additional units will start, etc. The total heating output capacity of the eight (8) rooftop units proposed for the warehouse is higher than the heating load requirements for the purpose of safety and redundancy. The proposed rooftop units are direct-fired 80/20 units that also must be sized to maintain slight positive pressure when the overhead doors are closed. As per load calculations with Trace700 software, the warehouse falls under the semi-heated space category. As per total output capacity (of the direct-fired rooftop units sized for building pressurization), the warehouse falls under the conditioned space category. If we must consider the warehouse as a conditioned space, using Appendix-G of 90.1 performance rating method, the baseline case for both the warehouse and the office space is System #7: Variable Volume with Re-Heat, chilled water cooling and hot water boiler. The use of VAV system #7 as the baseline model for an energy modeling comparison is not reflective of a real-world system for a warehouse building. The proposed system for the warehouse that would need to be modeled in this case would be Constant Volume Rooftop Units with gas heat exchanger and chilled water coils. The proposed office system is Constant Volume Gas-fired Rooftop Units with DX cooling. The system type actually being proposed for this project is commonly used for all warehouses in this country. The energy savings that will be attained from our improved-efficiency of mechanical equipment, reduced lighting power density and improved building envelope performance will only be accurately reported if the proposed design is compared to a realistic baseline. Questions: 1. Can we consider the warehouse as a semi-heated space on the basis of heating requirements per peak load calculations and compare the baseline and proposed cases per the semi-heated space criteria? 2. The ASHRAE Standard 90.1-2004 page G-23 allows a building to be modeled with separate system types for separate occupancies (such as residential and non-residential). Can we treat warehouse and office spaces under separate occupancies and model these spaces with separate system types?