Tenant Outfit Proposed Spaces

Lighting in these types of spaces will account for 20% to 40% of the total energy cost. Do you control all of the lighting or just the lighting outside the tenant spaces? If all then you can often get to the minimum savings with good lighting design alone. If just the common spaces it will be far more challenging. How about the thermal envelop, window configuration, daylighting, and many other energy saving opportunities which exist outside HVAC? How about modifications to the proposed HVAC system like energy recovery, demand controlled ventilation, etc.? The real purpose of running the simulation is to explore the possibilities during design.

As far as lighting in the tenant spaces is concerned, you can claim savings in that area but the owner would need to include tennant guidelines limiting the allowable lighting power denisty in those spaces. There is a CIR on the subject. Always harder getting started late in the game. Good luck.