i went to get in my car today and turn on the heat.. the heat didnt work at all on 2005 Hyundai Sonata

i also tried putting defrost and ac on and neither of this worked either. what could be my problem if I am getting no heat or ac at all?

Asked by for the 2005 Hyundai Sonata
when you say you are getting no heat do you mean the blower motor doesnt work?
im not sure if the blower motor works. I dont really know much on cars. but the knobs when turned click but nothing happens. could it be a bad fuse?