Saving energy by heating incoming air

Pig houses often need additional heating at moments when the climate can turn cold. This usually costs money, which is remarkable given that a pig house usually also generates energy. At Beerens farm, the Netherlands, both ends were put together. When building a new pig house, pig producers are usually very critical on every penny spent. Coen Beerens, age 49, a gilt breeder from Nederweert-Eind in the south of the Netherlands, decided, in 2015, for once to go against the tide and to invest that