Acre T farms based in Brussels is building new contract barns using naturally ventilated barn technology developed in the midwestern US. Electrical usage is low, barn construction is simple and maintenance/repairs are few. The barn is affordable to build. Barn ventilation is regulated based upon effective temperature and depends on pig size. Manure pits keep odour inside and rainwater out, reducing the volume of liquid that must be spread on nearby fields. Part of the improved knowledge going into these barns is their careful positioning to catch prevailing winds. The barn has several other operational advantages. Energy consumption is reduced greatly – 12 cents per pig place in the month of December compared to 39 cents per pig place in the standard fan barns with sandwich walls that Acre T now operates.