The swine barns in the Midwestern US are typically ventilated by curtain sided system (CS), or through tunnel ventilation (TV). The project Reducing the Environmental Footprint of Swine Buildings has set out guidelines to retrofit these buildings to a more efficient system. These systems use around 70% of the energy needed by the barn. Some of the general suggestions to reduce energy use include fan maintenance, switching to more efficient fans, properly sized minimum ventilation fans, proper temperature set points, proper heater set points and sizing, insulation and draft reduction, and reduce wind pressure on fans. Specifically for CS and TV barns, bubble wrap insulation can be used for walls, end walls and exhaust fans should be insulated, pit exhaust fans can be relocated, deep pits should be pumped twice a year, the L.P. Gas Heater settings can be changed, and the fewest fans possible for winter minimum ventilation should be used. For CS barns, the mechanical ventilation capacity can be increased to also save energy. Cooling systems in CS and TV barns are often sprinklers and circulation fans, but evaporative cooling pads or evaporative misting of air can be used as well.