In answering hundreds of inquiries concerning sunshine, sanitation and ventilation in hog houses, considerable data has been collected by the Agricultural Engineering and Animal Husbandry Sections and is now published in this bulletin. Sunshine and sanitation for hog houses are given chief consideration, but in addition, the various health essentials of the hog house are also emphasized. The ventilation problem is being studied and later it is hoped to issue a bulletin covering that specific subject.