How Does a Furnace Work?

February 13, 2020

If you ever have a furnace problem, it is helpful to understand just how your furnace works. Here’s a brief explanation.

The Furnace Process

The principle behind a gas furnace is simple enough. Air is heated and pumped out. Here’s the process by which that actually happens.

First, the thermostat sends a signal to the furnace that ignites the heating element. This is a burner, similar to something a gas grill uses, that burns either propane or natural gas. It’s the mechanism that creates the heat.

Next, that heat rises in the furnace to a heat exchanger. The exchanger transfers the heat from the furnace to the air that will be pumped out to the house. Once the heat exchanger is the right temperature, the circulating fan starts. This fan controls the flow of air through the furnace and the heating ducts.

The fan draws air through the return duct of the furnace and passes it through the heat exchanger, warming it up. Then, it is forced out through the duct system, and a continual draw is established. That is why these are known as forced air furnaces.

Know When to Call a Professional

Furnaces can be very dangerous when you start working on the internal components. If you fail to install something correctly, the mistake can lead to hazardous leaks. If you are not trained in how to service a furnace properly, you could also cause damage to the delicate parts. You are best served by enlisting a heating professional to install or maintain your furnace. Doing so keeps you and your family safe and ensures you are not wasting money guessing at which components may need attention.

Competent Assistance Is Available

Macari Service Center has been serving Shelbyville, IL, and the surrounding area since 1958. We proudly offer heating and cooling installation, maintenance and repair along with plumbing services and appliance repair. With more than 200 years of combined experience, our NATE-certified technicians know how to deal with your furnace correctly the first time. Call us today to set up an appointment.

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