Abstract: The invention relates to a system and device for controlling air-conditioning equipment, in particular to a method for controlling air-conditioning equipment in a chamber or the assembly of chambers consisting in pre-calculating at least one parameter selected between the temperature, chemical composition of the chamber or the assembly of chambers, the energy consumption of air-conditioning equipment and the energy production cost for a given time range by simulation carried out for an arbitrarily large number of explicit calculation formulae for a given time range and in selecting between said formulae the formulae called optimal explicit calculation formulae which meet predefined temperature and chemical composition restrictions and correspond to the minimisation of a cost function related to said energy production cost.