Does it make sense to conduct the survey twice. Once prior to the performance period and then during the performance period for credit compliance.

My concern is that if a lot of problems are revealed by the survey during the performance period, there might not be enough time to correct them.

It also seems more efficient to find out any issues with the HVAC system early so they can remedied along with other work on the ventilation system.

It could be costly to have the HVAC contractor work on the system to comply with other LEED credits, only to have to return again because the survey revealed occupants in an area weren't comfortable, and fix it within the 3 month window!