I had something odd like this happen to me the other night.. I came home and it was 82 in my house I keep it around 72 so I kinda start freaking out. after I reset the breaker to the blower and the out side until the outside unit still didn't kick on for a good 15 or 20 mins but has worked fine ever since... so it does take a little while for the heat pump or what ever to kick on