The environmental conditions of different swine building designs during the warm season were analised using data collected in several farms in the study including 153 buildings at 23 counties of the southern Brazil, observed from October 1981 to February 1983. The designs included open front, completely closed, completely open and mixed buildings. Temperature, relative humidity and air velocity were measured internally in each building at 7:30 AM, 10:30 AM, 1:30 PM, 5.00 PM and 8:00 PM. Temperature data were collected in several locations inside the building at 0.00; 0.30; 1.00 and 2.00 meters height from the floor, while relative humidity and air velocity were measured at the 1.50 meters height from the floor. There were no significant differences (P >0.05) among building designs for temperature and air velocity. Open front and completely closed building presented higher relative humidity values (P 0,05) da temperatura e da velocidade do ar entre os modelos de edificações. Os modelos unilateral e bilateral apresentaram taxas mais elevadas de umidade relativa (P <0,05) do que o aberto e misto. As temperaturas médias registradas no modelo unilateral (25,4oC), bilateral (25,6oC), aberto (25,3oC) e misto (24,3oC) foram elevadas, para suínos adultos; as taxas de ventilação (3,05, 4,04, 5,66 e 2,65 m/min, respectivamente) foram inadequadas em todos os modelos de edificação. Conclui-se que os criadores não utilizam adequadamente os recursos (fechamento) disponíveis nas edificações para o controle das condições ambientais.
