Why is my air conditioner blowing warm air?

Up until today, my air conditioner was working fine. It started blowing warm air only today. The filters are clean, no debris around condenser, changed both fuses in the fuse box. What could be problem? The unitis only one year old.

expert user

There are several possible causes: 1. Compressor problems2. Condenser problems3. Evaporator problems4. Freon line problems5. Expansion device problems6. Evaporator or condenser fan problems7. Thermostat problems The most likely cause is a loss of freon resulting from a leak in the evaporator,or more likely, the lines or the condenser.