The difference between a furnace lasting ten years or twenty often comes down to simple upkeep. Some of the main ways to extend the life of your furnace include using quality air filters and annual professional tune-ups.
It also helps if you keep the area around your furnace clear and clean, so dust doesn’t build up.
In this article, I will walk you through each tip and share pro insights to help you protect your system.
- 1. Change or Wash Your Filters Regularly
- 2. Schedule Annual Professional Maintenance
- 3. Keep Vents and Registers Clear
- 4. Set Your Thermostat Correctly
- 5. Balance Your Home’s Load
- 6. Don’t Ignore Warning Signs
- 7. Keep the Area Around the Furnace Clear
- 8. Clean and Seal Your Air Ducts
- 9. Know When to Replace Your Furnace
- FAQ About Extending Your Furnace’s Life
1. Change or Wash Your Filters Regularly
| Difficulty: Easy Frequency: Every 1 to 3 months Time Required: 5 to 10 minutes (plus drying time for washable filters) Tools: Replacement filter (or mild soap and soft brush) |
According to Dan Walsh, Vice President & General Manager at AAA Home Services, the most impactful monthly task is “changing your air filter every 30 days if you have pets or smokers, every 90 days otherwise.”
A dirty filter blocks airflow, forcing the system to work harder. Walsh says he has “seen countless furnaces die early because clogged filters force the system to work three times harder than designed.”
Your furnace will have either a disposable or a washable filter:
- For disposable filters, simply slide the old one out and slide the new one in, making sure the arrows on the frame point toward the furnace blower.
- For washable filters, gently remove the filter and vacuum any loose dust. Wash it with mild soap and warm water, then rinse thoroughly. Let it air dry completely before putting it back in, as a damp filter can lead to mold growth.
2. Schedule Annual Professional Maintenance
| Difficulty: Professional Required Frequency: Annually (in the fall) Time Required: 1 to 2 hours Furnace Maintenance Cost: $80 to $210 |
You can handle some tasks yourself, but you need a professional to inspect your furnace once a year. An annual furnace checkup is the best way to catch small problems before they become big, costly failures.
“Annual professional tune-ups catch the silent killers before they destroy your system,” says Walsh. “Our technicians regularly find cracked heat exchangers that leak carbon monoxide, loose electrical connections that cause fires, and dirty blower components that burn out motors.”
He notes that his team recently prevented several major system failures that would have cost homeowners over $3,000 each. This service is a small price to pay to ensure your system is running safely.
3. Keep Vents and Registers Clear
| Difficulty: Easy Frequency: Ongoing/As needed Time Required: 5 minutes Cost: Free |
Good airflow is essential for its health and efficiency. Blocked supply and return air vents in your home disrupt this airflow. This makes your furnace run longer and harder to heat your home, causing unnecessary wear.
Walk through your house and check that furniture, rugs, or drapes are not covering any vents. When airflow moves freely, the system runs more efficiently, and you’ll notice lower energy bills over time.
| Pro Tip: Also, ensure the exhaust vent and fresh-air intake are free from debris, leaves, or snow. |
4. Set Your Thermostat Correctly
| Difficulty: Easy Frequency: One-time setup Time Required: 10 minutes Cost: Free (with a programmable thermostat) |
A programmable thermostat is a smart upgrade that helps protect your furnace from overuse. Constantly adjusting the temperature up and down puts a lot of stress on the system’s components.
“Set your thermostat to a consistent temperature instead of constantly adjusting it,” advises Clay Hamilton, President of Grounded Solutions.
He explains that a system works most efficiently maintaining 68 to 70 degrees Fahrenheit rather than cycling between 65 and 75 degrees Fahrenheit multiple times a day. These massive temperature swings stress furnace components and reduce their lifespan.
5. Balance Your Home’s Load
| Difficulty: Easy to Moderate Frequency: As needed Time Required: 30 to 60 minutes Tools: Flat-head screwdriver |
Your furnace works best when air flows evenly. Cold spots mean some rooms don’t get enough heat, so the furnace runs nonstop trying to keep up. You can fix small tweaks yourself, but major duct changes need a pro.
Here’s what to do:
- Locate the small metal levers (dampers) on main duct branches in your basement or attic.
- Gently close dampers leading to warm rooms by about a quarter turn and open them more toward cooler rooms.
- Feel temperatures at floor level in each room after 30 minutes and tweak until they’re within 5 degrees Fahrenheit of each other.
If dampers aren’t marked or you can’t reach your ducts safely, call an electrician or HVAC technician.
6. Don’t Ignore Warning Signs
| Difficulty: Easy (to notice), Pro Required (to fix) Frequency: Ongoing awareness Time Required: Immediate action when a sign appears |
Your furnace should operate with a fairly quiet hum. If you start hearing other noises, the system is trying to tell you something is wrong.
Here are some common signs your furnace needs repair:
- Strange Noises: “The biggest mistake I see is homeowners ignoring strange noises until something breaks completely,” says Hamilton. “When you hear squealing, rattling, or banging from your furnace, that’s your equipment telling you exactly what’s about to fail.”
- Short Cycling: This is when the furnace turns on and off in very short periods. “Call a professional immediately if your furnace cycles on and off repeatedly,” urges Dan Walsh. He warns that short cycling often indicates an overheating issue that can crack your heat exchanger within weeks.
- Yellow or Orange Flames: The flame in your furnace’s burner should be blue. Hamilton cautions homeowners to “watch for yellow or orange flames instead of blue. This means incomplete combustion and potential carbon monoxide production.”
- Blowing Cold Air: If your furnace blows cold air despite calling for heat, the pilot light or ignition sensor may be failing. Check your thermostat, then call an HVAC tech to diagnose and repair.
7. Keep the Area Around the Furnace Clear
| Difficulty: Easy (DIY) Frequency: Ongoing / As needed Time Required: 5 to 10 minutes Cost: Free |
Your furnace needs space for proper air circulation. Many furnaces are located in basements, closets, or utility rooms that become storage areas. Do not stack boxes, laundry, or other flammable items near the unit.
| Pro Tip: Keep your furnace safe and accessible by giving it at least 30 inches of clearance on all sides. Avoid storing any items in this space, as clutter can block airflow, create a fire hazard, and prevent the HVAC technician from performing maintenance or repairs. |
8. Clean and Seal Your Air Ducts
| Difficulty: Moderate (DIY) to Professional Required Frequency: Every 3 to 5 years Time Required: 2 to 4 hours (Professional) Cost: $300 to $700 |
Your ductwork carries warm air from the furnace to the rest of your home. If your ducts are dirty or have leaks, your furnace is forced to run much longer to get your home to the right temperature.
Dan Walsh calls running a system with dirty ductwork “the most expensive mistake homeowners make.”
He adds, “We’ve measured 30% air loss through leaky ducts, meaning your furnace runs constantly trying to heat air that escapes before reaching your rooms. This constant strain burns out heat exchangers and blower motors years ahead of schedule.”
To maintain ducts:
- Hire a professional for a duct sealing inspection.
- Use mastic sealant or UL-rated foil tape on joints.
- Clean ducts every 3 to 5 years or more often if pets shed heavily.
9. Know When to Replace Your Furnace
| Difficulty: Professional Required Furnace Lifespan: 15 to 20 years Furnace Installation Cost: $3,230 to $3,820 |
Eventually, every furnace reaches the end of its life. Continuing to sink money into an old, inefficient unit is not a good investment. If your furnace is over 15 years old and requires frequent or expensive repairs, it’s often more cost-effective to replace it.
A new, high-efficiency furnace can significantly lower your energy bills.
FAQ About Extending Your Furnace’s Life
Neglect is the biggest enemy of a furnace. Forgetting to change the air filter is the most common cause of premature failure. This single mistake leads to restricted airflow, which makes the furnace overheat and wear out critical components much faster.
Improper sizing and installation can also significantly shorten its life.
There are a few important furnace maintenance tasks you can do yourself, like changing the air filter and keeping vents clear. However, some jobs are only for a trained professional.
“Never attempt electrical repairs on your furnace yourself. The 240V connections can kill you instantly,” warns Hamilton. He stresses that anything involving wiring, gas lines, or the control board requires professional training.
Proactive Furnace Care is Your Payoff
Think of furnace maintenance as a strategy, not a task. Consistent, small actions are what save you from the stress of a cold house and unexpected repair bills.
As experts like Dan Walsh advise, it’s far cheaper to find and fix hidden issues during a routine checkup than to deal with a full-blown emergency.
For more comprehensive, expert assistance, always consider hiring professional furnace services to ensure your heating system remains robust and efficient.
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Main Image: An energy-efficient furnace in a basement. Photo Credit: oasisamuel / Adobe Stock
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