Our ac will be working great and then all of a sudden stop blowing cold air, room temperature air will blow instead which heats the house up quick. If we turn the unit off for an hour or two it normally starts to blow cold air again once it's back on. We've checked to see if the unit if frozen under the house and it is not. There seems to be no rhyme or reason to why this happens. We have a baby on the way in 3 weeks and would love to know what the problem is before he gets here!