Interior climate is one of the main comfort factors during a trip and is also very important for interior safety because temperature, humidity and ventilation affect the driver's well-being and thus his level of alertness. And of course the heating and ventilation system is also responsible for demisting the windscreen and side windows. 
For this reason, the Lancia Ypsilon comes with a sophisticated climate control system that automatically controls temperature, air flow, air distribution, compressor activation and recirculation by means of an electronic control unit. It also acts as a dual zone climate control system, i.e. able to ensure two different temperatures simultaneously: one in the right part of the passenger compartment and the other in the left. 

The Lancia Ypsilon also implements an equivalent temperature climate control strategy. It records internal and external temperature by means of certain sensors and assesses the sensation of thermal well-being experienced by passengers, i.e. the energy exchange between human body and passenger compartment that is affected by humidity, temperature and treated air flow. 

Another sensor located in a central position at the windscreen base records solar radiation on the car and the angle at which the rays strike the passenger compartment. This allows the system to prevent an excessive increase in temperature inside the car caused by the sun and thus to inform the climate control system in time. 

All these parameters are monitored continuously and used to update the distribution, ventilation and mixing automatically. Air temperature and fan speed are therefore adjusted to ensure passengers experience the desired sensation of thermal well-being (achieved by setting the required temperature). The result is a constant climate, even with significant changes in external conditions. 

The system may be adjusted to one of seven combination settings and one of the three temperature settings to allow air taken into the car to reach all areas of the passenger compartment. 

The possibility of altering interior temperature gradually, half a degree at a time, makes for outstanding climatic comfort. The knob can be used to bring about a temperature change of 16°C, with a maximum temperature difference of 7 degrees between the left and right areas. Manual selections always override automatic settings. 

They are also indicated by deactivation of the Full Auto led and stored until the user cancels the command. Each time the system is turned on, it returns to the conditions saved upon deactivation, except for the 'MAX DEF' function, which is zeroed. The entire system can also be turned off manually to deactivate the air conditioning system fully.