Room Air Conditioners…

night it blew my breaker and everything was off except the air can some one tell me why it blew?

Neither the fan or air conditioner cuts on and the temperature reading on the thermostat says 71 when its way hotter then that.

I was driving down the highway (in my 2001 Toyota Celica) with my AC on and then all of a sudden it stopped blowing cold air, and hasn’t worked since. What could the problem be? and how much should it cost to fix it?