Additional costs may be incurred if you need to buy modeling software or hire a qualified engineer to perform this assessment. Unless this assessment was performed and documented during the design phase of the building, it’s unlikely that the costs to ret

Additional costs may be incurred if you need to buy modeling software or hire a qualified engineer to perform this assessment. Unless this assessment was performed and documented during the design phase of the building, it’s unlikely that the costs to retroactively perform the assessment are worth pursuit of this credit, since it would not generally be feasible to change the natural ventilation system design in an existing building just for the purposes of this credit.