In the paper the nature of activity of the automated ventilating systems and air conditionings (V and AC) under condition of their regulation "on deviation" is reviewed.

The analysis of processes descending in V and AC and maintained room is given.

The outcomes of numerical calculation of a non-steady thermal mode of a room with the computer program designed by authors are adduced. The confrontation of the obtained outcomes to the data designed before an approximated analytical technique is conducted. The identification of analytical model with selection of best values of numerical constants is carried out.

The presentation is illustrated by a significant amount of a graphic stuff.