I have a airease johnson furnace/air condition unit that won't come on. I have had trouble with it in the past and messed with the thermostat and then it would come on,but that doesn't seem to be working at this point.

Jump the thermostat wires for the heat circuit. That will eliminate the thermostat from the circuit and the furnace should run. If it does run your thermostat is defective. If it does not run it is something else than the thermostat.
Look at the sticky notes at the beginning of this board for more information about furnaces and how they work.