It is important to note, that there are a variety of reasons that your furnace won’t turn off, many of which are outside of our control. For such difficult reason take the advice of professional. If you want to try it on your own check that your thermostat is set to heat (vs cool), check that it is in the “auto” or “on” mode of operation, check your thermostat’s programmed temperature versus the temperature it is in the house. For more details to choose a reputable contractor do check furnace repair service NJ. Thus, there are many of such repair, services out there that still do things the right way.