House Shields were the choice of defense for many Great Houses. The name House does not come from its use by Great Houses, but by what it protected: the home of a Great House. Any palace or castle or any home to a House was protected by this shield.
The shield was a larger version of the defensive shield worn by a person and could cover large areas without becoming unstable, as a Pentashield would do. Because of its massive size, a House Shield couldn't be shorted-out by a Lasgun.