ASHRAE 90.1 mandatory provisions require amongst other things to have vestibules for all main building entrances.
In a retail project, is there a possibility to replace the vestibules by air curtains instead, since they would provide similar energy-efficient benefits, end reducing the heat transfer between the indoor and outdoor spaces? Has anyone experienced this before?
Also, for a Mall, do you think the need for vestibules is required for entrances to the Mall at roof level, where the roof has open air cafes and amenities?
Many thanks.