A portable device designed to heat the cold air that is inhaled through a person's nose is revealed, thus protecting respiratory function in adverse climates, especially for those suffering from lung diseases and the like, or for those who are susceptible or at risk of acquiring these diseases due to their age or work and need a protection mechanism. This device is composed of a support system and an energy system, wherein the support system guarantees the stability of the device next to the nose of the user, while the energy system heats the air that the user inhales through the nose and allows the user to regulate the temperature of the heat sink located near the nose by means of a control knob.