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Two field trials, lasting five weeks each, were conducted during the summer of 1989 to evaluate the effectiveness of an annex ventilation system used to supply summer ventilation rates in a swine nursery building. Assessment was based both on climatic environment data and growth response of 96 early weaned crossbred pigs, three to four weeks old when weaned. Under mild summer conditions the ventilation system provided sufficient control of the environment and resulted in animal heat stress of short duration and intensity. During periods of very hot weather the system failed to provide a thermal microenvironment within acceptable limits and pigs were subjected to longer intervals of heat stress. Heat stress degree-hours during Trial II were more than two times those of Trial I, but this did not seem to have a negative effect on the animals growth performance.