It is a longitudinal research design with repeated measures. We followed the same occupants working in the same organisation, a commercial company in Jordan, as they moved from four conventional buildings to a single JGBG-certified “green” building. The repeated measures cover buildings' parameters (thermal conditions + CO2) and occupant aspect (satisfaction, thermal comfort, and perceived health). We did the measurements in three rounds: one in the old conventional buildings and twice in green building (6-month + 12-month after transition).