My furnace will kick on but it is not blowing out hot air. The thermostat is set at 73 but the actual house temperature is reading at 53. The thermostat is set to heat. I can hear that the furnace is running, but it is just blowing out cold air. Is there something that I can do myself to fix this or should I just have a professional look at it?

Read the faq it may guide you to a repair

Identify your furnace so you know what to look for.

Most newer units have a status light that may give insite to the fault