Does anybody here know anything about central air conditioners? Mine decided to stop working, and it's supposed to be 100 degrees here tomorrow. Being the fourth of July, I expect getting somebody out to service it will be nearly impossible, or otherwise cost me hundreds of dollars. The outside unit sounds like it runs just fine, and I hear something running in the furnace. However, there is merely a trickle of air coming through the vent in the basement, and none reaching the top floor at all. Any suggestions?