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How Does a Furnace Work?

If your home is heated by a furnace, it’s important to know how your heating system works. It will allow you to make better decisions about the maintenance of your furnace and can even help you extend the lifespan of your equipment. Find out how a furnace works from the heating experts at Arctic Air Conditioning. We’ve been providing homeowners in Monmouth, Middlesex, and Ocean County, New Jersey with exceptional heating services and advice since 1977. We can help you understand your home heating system so when it comes time for maintenance, you’ll understand what your furnace needs. Contact us today to learn more or schedule an appointment.

How a Furnace Works: A Complete Heating Cycle

A furnace is a type of forced-air central heating that heats the air in your home through the combustion of a fuel. The process of how a furnace works is by regulating the temperature through a series of steps that are repeated until the indoor air reaches the temperature set on the thermostat.

Here’s how a furnace works:

  1. When the thermostat determines that the temperature in the room has dropped below the temperature set on the thermostat, the heating cycle can begin.
  2. The inducer fan in your furnace will start, pulling enough air into the unit to establish combustion airflow.
  3. Once proper airflow is established, the gas valve opens to permit gas to flow through the burners and be ignited by a spark or heat from the igniter. (In older models, there is a “standing pilot” light which is a small flame that burns constantly to ignite the gas.) The spark or igniter will go out immediately after the flame has been lit.
  4. The flame will heat up the heat exchanger for approximately two minutes before the blower turns on. This allows the metal walls or tubing in your heat exchanger to absorb the heat from the flame so it can later be transferred into the air in your home. Another important step that occurs in your heat exchanger throughout this process is the release of toxic gases that are a byproduct of the fuel combustion. As carbon monoxide is collected in your heat exchanger, it is safely expelled through an exhaust vent out of the house.
  5. After the heat exchanger has reached the right temperature, the blower fan will engage, drawing air from the house through the return ducts and blowing over the heat exchanger, where it will absorb the heat energy stored there.
  6. The warmed air is pushed on by the blower into the supply ductwork to be redistributed back into your home.

This process will repeat multiple times until the desired temperature set on the thermostat is achieved. Understanding how a furnace works is very important for any homeowner, so if you have any questions about your heating system, contact Arctic Air Conditioning today. Or if your furnace isn’t functioning properly as you know it should be, we can provide exceptional furnace maintenance or furnace repair in Monmouth, Middlesex, or Ocean County, New Jersey. Our highly skilled and fully certified technicians can handle any furnace service you may need—contact us today to schedule a service call!

5 Rating |

”My furnace was not working and their technician Kevin was able to fix the problem to my satisfaction”

- David Katz
5 Rating |

”Very professional and courteous.”

- Paul Brown
5 Rating |

”Jesse from Arctic Air was on time and after a quick inspection found the problem and solved the issue immediately Would definitely recommend Arctic Air!”

- George Athanasakis
5 Rating |

”They do all you a/c, heating or plumbing repairs.”

- Rosemary Smith
5 Rating |

”Good installation, neat, clean and professional”

- Roger Styczynski
5 Rating |

”Great service, clean & reliable”

- John Cagney
5 Rating |

”I was having difficulty selecting a company to repair my heating system. I did a great deal of research and finally decided upon Arctic Air Conditioning. I had been having…”

- joan gallagher
5 Rating |

”Heating system went down over night and searched on line for a HVAC contractor to do the repair. Arctic Air has the best and most reviews online for central Jersey.…”

- Kristina Wang
5 Rating |

”Used this firm several times now for maintenance and repairs. Every tech is friendly, professional and courteous. You can trust this firm. My units are closing in in the end…”

- Matthew Corey
5 Rating |

”Tony was amazing.”

- Fatima Velija
5 Rating |

”Excellent service. Fast and friendly. It doesn’t get any better than these guys! Very knowledgeable!”

- John Christopher Wesley
5 Rating |

”Kyle our service man today from Arctic Air Conditioning and Heating was super friendly and extremely efficient. He was able to diagnose the problem we were having very quickly. We…”

- Stuart Gleich
5 Rating |

”Fantastic service. All involved went above and beyond for me Would recommend to anyone needing HVAC work . A++++”

- Joe Holland
5 Rating |

”Arctic Air came to my home on 02/12/2019. After evaluating my furnace, we together, identified the furnace required more than repair the entire bottom of the heater was totally rusted…”

- James McLean
5 Rating |

”Very professional and friendly service”

- Maureen Howley
5 Rating |

”I had a new HVAC system installed early December and have been very happy with it. My house is warmer than it ever was. Yesterday, after adjusting thermostat, heat stopped…”

- Marlene Feldman
5 Rating |

”Very professional and organized.”

- Generic Customer
5 Rating |

”I called Arctic Air when my furnace stopped working unexpectedly. Customer service was very friendly and scheduled someone to come to my house within an hour. Before the technician arrived…”

- Gisele Salvodon
5 Rating |

”Always professional and great service by Arctic. We are loyal customers.”

- Marjorie Snyder Wold
4 Rating |

”Ah ...never mind ...Susan called me ..and is gonna make things better...thanks! ...I'll leave a nice review on Google ...once I get my heat back on!”

- Generic Customer
5 Rating |

”Arctic Air came in and fixed a situation we had with Temprite. They came so quickly, the tech is so knowledgeable and nice. We are so thankful and will continue…”

- Amanda Paige Heimberg
5 Rating |

”By far best heating and air company!! Honest and dependable”

5 Rating |

”We’ve had 3 or 4 service calls with Arctic Air, with different technicians each time. Each of them has been nothing short of excellent. On time, polite, able to diagnose…”

- Daniel Ginzburg
5 Rating |

”Arctic Air is THE BEST! Outstanding and prompt service!”

- howard fine
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