Look at your code, you have the following constructors:
public Fan(int speed, bool on, double raduis, string color)
{
this.speed = speed;
this.on = on;
this.raduis = raduis;
this.color = color;
}
public Fan(int seo, bool to, double ro, string ce)
{
speed = seo;
on = tp;
raduis = ro;
color = ce;
}
You cannot have two with the same signature, remove the one that you do not want.