Rotating Lab Equipment and How to Include It?

I am currently working on a lab facility which has five labs of varying types. Our original intent was to create our energy model only using the base building equipment and technology since the owner's intent is to have a rotating mix of equipment in and out of the facility all year long. The equipment is also being installed under a different contract and while we are providing the fit-ups, we are not connecting the equipment as part of our contract. However, where its complicated is that the initial (first) equipment will be installed at the time we seek building occupancy, so I want to know if we have to model all of the baseline equipment and the lab equipment knowing that it will be in constant flux. I have more information if necessary, but I think that gives a good general concept of my question. Hopefully there is a simple answer.