Homeowners may determine how long their furnace will survive before it has to be replaced by looking at its size, installation, and effects on indoor temperature. 


Are you curious about the average lifespan of a gas furnace? The lifespan of a furnace is a subject of discussion. Although some furnaces may survive up to 40 years (which is exceedingly unusual), the typical furnace lifespan is between 15 and 30 years. It should easily last over 15 years if you have regular furnace maintenance scheduled.

Oil-Fueled furnace lasts the longest, whereas gas-fired furnace lasts the shortest. Homeowners should be aware of their furnace’s fuel source, whether it’s oil, gas, or electricity, because it affects its longevity, as well as the details of maintenance and energy expenses.

A furnace that is more than ten years old should be given special attention, as the majority of furnace repairs occur during the latter quarter of its life. If a homeowner is unclear about the age of their furnace, they can look up the serial number in the furnace’s manual. 

The numbers show the year the furnace was built. If a manual is not accessible, the furnace should have a label with the model and serial number, either on the outside of the unit or within its door or cabinet.

A Properly Sized Furnace For Your Home Will Ensure A Long Lifespan

Choosing the right size furnace is more than just deciding between a smaller unit that saves money and a larger unit that warms faster. The efficiency of a furnace is determined by the total square footage of a home and the heat output required for temperature change. 

Not all homes with the same square footage require the same amount of heat. Climate, property vegetation, and home construction factors all influence how hard a furnace must work.

A unit that is too small will overwork, always working in order to maintain an acceptable heat level. This prematurely ages a furnace, reduces its lifespan, and raises energy expenses. A unit that is too big will not operate continuously but will cycle on and off more frequently than is necessary for proper operation. Excessive cycling can cause damage to some of the most vital parts of a furnace, increasing the likelihood of early repair and replacement.

A Furnace’s Life Might Be Shortened By Poorly Designed Ducting Or Improper Installation.

Because air is a gas, it constantly travels to fill any space it is placed in. When the lid of a container is lifted, for example, air spreads and fills both the container and the surrounding space. The same holds true for hot air from a furnace. All warm air will flow where it needs to go if the ducts are properly sealed. 

When ducts have cracks or are improperly laid out, hot air is squandered on regions that do not require it. This overworks the equipment, similar to a furnace that is too tiny.

The proper installation of venting and fuel lines is also required for furnace operation. When properly configured, a furnace will use air and its energy supply to operate effectively. Insufficient airflow and energy input damage the inner workings of the furnace when set up incorrectly. It also raises a safety concern: carbon monoxide exhaust leakage.

To Get The Most Out Of Your Furnace, Routine Maintenance Is Required.

All furnaces include filters, and replacing them on a regular basis is the simplest approach to ensure furnace efficiency. Filters have an impact on air quality, but they are most significant in terms of maintenance. A clogged filter reduces airflow, forcing the furnace to work harder. It can also overheat, resulting in wasteful shutting down and cycling. To avoid these adverse effects on lifespan, homeowners should replace furnace filters every season.

The energy source and size of a furnace determine additional maintenance. Because its fuel must be distributed and kept in a tank, an oil furnace, for example, will be inspected more frequently than a gas or electric furnace. It also leads to increased accumulation, necessitating more filter replacements. Because a larger home’s furnace uses more air, it may require more frequent filter replacements.

Temperature Changes And Rising Energy Costs Might Indicate That It’s Time For A New Furnace.

Even the most well-maintained furnaces will need to be replaced at some point. Some clear signs are visible and disturbing (such as weird sounds or debris), but there are a few things that all homeowners should be aware of.

Old furnaces become ineffective, affecting airflow and temperatures in a home. If rooms or levels aren’t heating as evenly as they used to, requiring regular thermostat changes, it’s likely that a furnace has to be replaced, especially if it’s already been repaired.

If temperature changes aren’t noticeable, inefficiencies may be seen on electric bills. When a furnace reaches the end of its useful life, it consumes more fuel to complete its job, resulting in a higher energy cost. If fuel or delivery costs haven’t risen but total energy costs have, homeowners should think about investing in a new, more efficient furnace to last the next few decades.

Are you unsure if your furnace has to be replaced or needs to be repaired? Contact Calvey Heating and Air to service your furnace.

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