Your furnace works hardest on the coldest night of the winter. That is often the night an old furnace quits. Many Bremer County homeowners learn their furnace’s age only when it stops heating.
So how long does a furnace last? Most furnaces last 15 to 20 years. This guide explains how to find your furnace’s age, what shortens its life, and how to plan a replacement before a breakdown forces the decision.
How Long Does a Furnace Last on Average?
A typical furnace runs for 15 to 20 years. Careful installation and steady upkeep can push that number higher. Neglect and poor sizing can cut it short.
Age alone does not tell the whole story. Two furnaces installed in the same year can wear out a decade apart. The difference comes down to how each home treats its system.
How to Find Your Furnace’s Age
Start with the label on the furnace cabinet. Many labels show the manufacture date or a serial number that includes it. Take a photo so you have the details handy.
A heating contractor can read the code if the label confuses you. Knowing the age tells you how close your furnace is to the end of its range.
What Shortens Furnace Life?
Several habits and conditions wear out a furnace before its time. Most of them trace back to how the furnace is installed, maintained, and used.
Skipped Maintenance
A dirty filter forces the blower to work harder. ENERGY STAR notes that a dirty filter raises energy costs and can damage equipment. That damage can lead to early failure.
ENERGY STAR also recommends that a contractor check your heating system each fall. A yearly check catches small problems before they grow.
Poor Sizing or Installation
A furnace that is too big heats the house fast, shuts off, and starts again. That constant cycling wears out parts. A furnace that is too small runs nonstop and strains its motors.
Good installation matters from day one. A contractor should match the furnace to your home and check the ductwork.
Heavy Use in Long Winters
Long Iowa winters keep a furnace running for months, and Iowa’s climate affects your HVAC system in other ways. More runtime means more wear on the blower and other parts.
A furnace in a Waverly home works more hours each year than one in a mild climate. That extra work adds up over 15 or 20 winters.
Warning Signs Your Furnace Is Near the End
Your furnace often gives clues before it fails. Watch for these signs:
- Your furnace is more than 15 years old.
- Your heating bills climb while your usage stays the same.
- You get repair calls more often each winter.
- Some rooms stay cold while others run warm.
- The furnace makes new banging, rattling, or squealing noises.
- The furnace starts and stops without finishing a normal heating cycle.
Treat a gas smell or a carbon monoxide alarm as an emergency. Leave the home, then call 911 or your gas utility.
Should You Repair or Replace Your Furnace?
Age guides the choice. A furnace past 15 years with rising repair bills usually points toward replacement. A newer furnace with one small problem usually deserves a repair.
Efficiency matters too. Modern high-efficiency furnaces reach an AFUE rating of 90 percent or higher. AFUE shows how much of your fuel becomes heat. The U.S. Department of Energy explains furnace efficiency ratings in detail.
An old furnace wastes more of every fuel dollar. Ask your contractor for a written estimate for both options. Then compare the repair cost with the price of a new system over the next ten years.
How to Help Your Furnace Last Longer
A few habits protect your furnace and add years to its life:
- Change the filter. ENERGY STAR advises you to inspect, clean, or change it once a month. Follow your manufacturer’s guidance for your filter type.
- Schedule a fall check. Book your heating check before the cold arrives. Then follow our HVAC winter prep guide for the rest of your home.
- Fix small problems early. A minor repair costs less than a failed part that damages other components.
Furnace Help in Waverly and Bremer County
Crystal has served Waverly and all of Bremer County since 1930. Our team handles heating installations for homes and businesses. We also provide emergency service when a furnace stops working.
See every option on our heating services page. You can also browse our full heating and cooling services.
Frequently Asked Questions
How long does a gas furnace last?
Most gas furnaces last 15 to 20 years. Regular maintenance and correct installation help a furnace reach the high end of that range.
Can a furnace last 30 years?
Some furnaces do, but it is uncommon. A furnace that old burns more fuel than a new one. It also carries a higher risk of sudden breakdown. Have a contractor inspect any older furnace.
How often should I change my furnace filter?
ENERGY STAR says to inspect, clean, or change your filter once a month. Check your furnace manual for the right filter type and schedule.
When should I schedule furnace service?
Schedule service in the fall, before the heating season starts. ENERGY STAR notes that contractors get busy once winter arrives.
Should I replace my furnace before it fails?
Plan ahead when your furnace passes 15 years and repairs keep adding up. A planned replacement gives you time to compare options and pick a schedule. An emergency swap in January leaves far less room to decide.
Schedule Your Furnace Visit Today
Is your furnace near 15 years old, or does it break down often? Contact Crystal today. Request a free quote, and our team will provide a personalized estimate based on your needs.
Start on our heating services page, then request your free quote or call (319) 419-4259.
