Any claim about winter production of fresh vegetables, with minimal or no heating or heat storage systems, seems highly improbable. The weather is too cold and the days are too short. Low winter temperatures, however, are not an insurmountable barrier. Nor is winter day-length the barrier it may appear to be. In fact most of the continental US has far more winter sunshine than parts of the world where, due to milder temperatures, fresh winter vegetable production has a long tradition.
Warm barns make for cheery farmers but they are not so good for the animals. Furry farm creatures, especially ruminants, are suited by their natures for temperatures far lower than man finds comfortable. As has been observed widely, farm animals, given the choice, will often spend their time out of doors even at very low temperatures in winter. Animal shelters need only prevent the occupants from being exposed to draft and humidity, for it is these and not the cold, that lead to winter diseases in bird and beast.