A head for an apparatus for applying cold-based treatments and method for applying locally a cool therapy with the use of the head end.It comprises chassis (1) with interior cavity (2), which houses first cooling conductor plates (3), facing each other, at least one suction orifice connected to suction means, at least one Peltier cell for each first conductor plate (3) in contact with this plate and with second conductor plates that dissipate heat towards cooling means, a temperature sensor that monitors the temperature of at least one Peltier cell and power supply means (5).