A little more information would be helpful.
Year, make, model...stuff like that.
Is there any brand name on your control panel?
Did it ever work or is this a newer unit?
Usually you won't ever get heat from your air conditioner unless you had heat strips added to them. Usually you will only get heat when you are set to the furnace mode.
They don't want you to be heating and cooling at the same time.
We are using an electric heater this morning as abc40kids mentioned (with 40 kids running around he probably doesn't need a heater much anyways) so I second his suggestion of a heater. Mine is the $20 variety...actually $5 at a yard sale.