Air conditioning - is the maintenance of certain parameters of the air environment: temperature, humidity and air mobility. This definition of conditioning, nowadays is more often only understood as the cooling air. Air-conditioning - automatic maintenance indoors all or some of the air parameters to ensure optimal mainly meteorological conditions most favorable to the well-being of people of the process, safeguard valuables.

Heating - is an artificial space heating during the cold period in order to redress their heat and maintain at a given temperature level corresponding to the conditions of thermal comfort, and sometimes the process requirements. By heating understand well the device performs this function. Heating system - a combination of technical elements for production, transport and transfer of all the heated rooms of heat required to maintain the temperature at a given level.

Ventilation - is the movement of air ventilation. Ventilation - is a fundamental factor in health, the health and well-being a person in the room for a long time.  If ventilation is working properly, we just do not notice, but if her performance is broken, then this translates into a big problem.  The presence of ventilation systems is so important that requirements to their specifications have the force of law and are registered in the building regulations.