Air no longer works

I have a 2010 ford focus with 153,000 miles. Recently my wife and I went on vacation and the car was idle for two weeks. When the car was driven, the air conditioner only blows hot air. I had someone check the Freon level and it was good. Any suggestions why this might have happened?

Have “someone” check and see if the A/C compressor is running and the high and low system pressures are correct…