Outside shutters, either roll up or swinging; better windows, with thicker glass and more layers; making sure the windows and door openings are properly air sea

Outside shutters, either roll up or swinging; better windows, with thicker glass and more layers; making sure the windows and door openings are properly air sealed, as well as all construction joints (corners, inside corners, where the wall meets a floor or the roof, the connection between the foundation wall or slab and the walls...). Also, all penetrations for wires, pipes, etc. need to be air sealed.