This paper describes the ventilation, the air conditioning and its control system’s development for the archive premises in Riga, Latvia. The archive premises are located in two floors, one of them is in the basement. The ventilation and the air-conditioning system in the archive premises is developed according to the standard DIN 1946/4. The air handling unit’s technical data, energy consumption, and sequence of operation and control systems development is analysed according to the average meteorological year of Latvia. The main objective for the HVAC and control designers was to maintain 18°C of indoor temperature and 50% of indoor air humidity all year round using two air handling units in sequence. The results of the achieved climate are analysed with the trendlogs, which are saved by the control system. Paper results can be used for ventilation and air conditioning development for other archive premises.