The day the central air died

So yeah, the central air conditioning appears to have heaved and died.  It’s been between 75-77 degrees in the house today, and it feels hot!.  Stuffy is more like it.  We last had the system serviced in 2006, but I’m hoping it’s not too serious.  I will have to call a few places about getting a diagnosis, but I don’t know when I can get someone this week to come to our place. I’ve already got both Verizon and my parents coming over sometime. Monday.