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A field investigation was conducted during cold and moderate weather to determine the within house temperature variations in high density caged layer houses and if there was a relationship to the inlet flow characteristics. Data collected at fixed cross sections from five different houses showed an average maximum temperature variation of 5.5C. During periods of moderate or low ventilation rates, temperature variations had a low correlation with all the inlet flow characteristics as described by Reynolds, Archimedes and jet momentum numbers. This suggests that inlet jets are not capable of consistently maintaining uniform temperatures in currently designed caged layer poultry houses.