The air is not coming on and the thermostat reads -AC?

The "-" may mean No and the AC may be no AC power.

This may suggest a tripped breaker, a blown fuse on the control board or a bad step down transfomer.

For, now I'm guessing.

The air is not coming on and the thermostat reads -AC?

Is outside condenser unit working?
If so feel the biggest of the 2 copper lines going into the house,is it very cool or cold?