Thermal Mass

Clay brickwork has high thermal mass. If a building with internal clay brickwork walls and concrete
floors is subjected to a heating and cooling cycle that crosses the comfort zone, the brickwork and concrete will maintain a relatively stable level of heat energy for an extended period. In summer, they will remain relatively cool and winter, the same building will remain relatively warm. Link

Mark, Paul and Matthew will be delving into the world of reverse-brick veneer construction and giving up-to-date posts on how you would achieve this.