If there is no air coming out of your air conditioning vents, check first to make sure your thermostat is set correctly and you have no tripped breakers. If your system is set to cooling and your themostat is set correctly and there are no tripped breakers most likely your system is frozen up or you have a problem with your evaporator blower motor. So check to see if there is ice on your system. See the "What Is freezing up?" Faq. If you do find that you have a tripped breaker you can try to reset the breaker. If the breaker immidiately trips again or trips shortly there after you will need a service technician to come check your system. See "The breaker to my air handler is tripping." faq.