What Is a Furnace?
To be clear, you may have a different heating system, such as a boiler, heat pump, or active solar heating. If your heating system heats water and you have radiators, you have a boiler. A heat pump is basically an air conditioner that works in reverse. Keep in mind that many homes have a hybrid heating system, which combines the energy efficiency of heat pumps for mild weather with the powerful heating capacity of furnaces during more extreme temperatures.
When there is a problem with your furnace, it is usually the thermostat (control system), gas valve/thermocouple/heat exchanger (heat source), or the blower/air handler/ductwork (distribution system). In any case, a trained and qualified HVAC technician will be able to fix the problem quickly and effectively.
Welcome to Furnace 101, where we teach you the basics of your furnace and how it works to provide heating to your home.