During cold seasons/outdoor temperature ranging from -6 to 15°C/ it ia possible to keep the optimal microclimatic conditions in cold 3-storey battery laying house except for CO₂ concentration /max. value 0.54%/ air microflora /max. value 769.3 thousand/m³/ and light intensity minimal value 1.8 lx/. Statistically significant differences occured between the upper and lower storey of battery cages in the light intensity, temperaturs, relative humidity and cooling. The basic parameter, e.i. inside temperature, was highly correlated with ventilation value /r = 0,89/ but less with outdoor temperature /r = 0,47/.