1) Admitting air currents 2) Draughty 3) Hardly airtight 4) Having open windows 5) Improperly insulated 6) Improperly ventilated 7) Leaky 8) Like an overventilated room 9) Like most barns 10) Like some attics 11) Not airtight 12) Not stifling 13) Not well insulated 14) Poorly insulated 15) Poorly sealed 1) Draughty 2) Leaky 
[adj] - not airtight
draughty adjective not airtight
characterized by or admitting currents of air, usually uncomfortable.