Replacing a gas furnace typically costs between $3,800 and $10,000 fully installed. The total price depends heavily on the unit's size, efficiency rating (AFUE), and any necessary modifications to your home's ductwork or venting.
New Furnace Cost
That being stated, let's take a look at the average furnace replacement cost as posted by HomeAdvisor.com: Gas Furnaces: If you have a natural gas furnace in your home, average pricing can range between $3,800 - $10,000, which includes labor costs starting at $1600.
Carbon monoxide (CO) is a colorless, odorless, tasteless gas. A by-product of combustion, it can be produced by ordinary appliances, and is a common hazard in the home. Mild exposure can cause symptoms such as nausea, dizziness, or headaches; while severe poisoning can result in brain or heart damage or even death.
The average gas furnace lifespan is 15 to 20 years. They can last longer, and they can fail earlier, depending on the quality of the unit to begin with, proper installation, and how well they've been maintained.
Yes, you should highly consider replacing a 30-year-old furnace. Most furnaces have a lifespan of 15 to 20 years. At 30 years old, your system has likely outlived its expected life. It is operating at a much lower efficiency than modern units and presents a significantly increased risk of catastrophic breakdown or dangerous carbon monoxide leaks.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
5 Warning Signs It's Time for Furnace Replacement
If the flame is yellow or flickering, this suggests incomplete combustion has occurred, which can produce carbon monoxide. Carbon monoxide poses health risks that could be fatal, so a gas heater with flickering flames should be inspected and replaced as soon as possible.
The heat exchanger is often considered the most costly part of a furnace to repair or replace. It is a critical component that transfers heat from the combustion process to the air that circulates throughout your home. Over time, heat exchangers can crack due to the constant heating and cooling cycles they undergo.
Yes HVAC prices have steadily increased over the past few years, and 2026 is no exception. These increases are affecting everything from entry-level systems to high-efficiency units, making it more expensive than ever to install or replace HVAC systems.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
Symptoms of carbon monoxide poisoning include:
Ventilation in the room you are heating is very important. Check that the room you are heating has air vents and that these are not blocked. If you do not have air vents you should keep a door or a window open to allow the movement of air in and out of the room.
Gas furnace installation: Can be more time-consuming due to the need for safe gas line connections and proper venting. Expect closer to 6 to 10 hours. Electric furnace installation: Generally quicker since it avoids gas and venting work, often in the 4 to 6 hour range.
Many of the symptoms of carbon monoxide poisoning are general and can be mistaken for the flu or the common cold. Symptoms like headaches, general malaise, nausea, fatigue, and dizziness can all be symptoms of carbon monoxide exposure.
Federal tax credits for residential furnaces and HVAC systems expired at the end of 2025. If your furnace was installed and placed in service in 2026, it no longer qualifies for the Section 25C Energy Efficient Home Improvement Credit.
While rare, a furnace can last up to 30 years with excellent maintenance, but most systems begin to lose efficiency and reliability after 15 to 20 years.
2026–2027: The “Slow Grind” Years
Expect modest price appreciation as inventory remains tight. Mortgage rates may ease into a more moderate band, but not enough to create a true affordability reset. Buyers who enter during this window get the advantage of less competition and more negotiating room.
What fails first on a furnace? The most common early failures are the furnace ignitor or flame sensor, as they experience regular wear and tear and are critical to starting the heating cycle.
Try the Salvation Army, a local church, or a community action agency. Their rules may be different. Ask About Payment Plans: Many local HVAC contractors, including Smart Climate Solutions, offer payment plans for urgent repairs because we believe everyone deserves a warm home.
Homeowners insurance may cover the cost to repair or replace your furnace or boiler if it's damaged or destroyed by a covered peril. Covered perils as defined by your policy typically include events such as: Lightning. Fire.
Plan on scheduling maintenance once a year. The ideal time is in the fall, usually between late September and early November. That gives a technician time to inspect and clean everything before your furnace starts working full-time.
Top Things That Can Go Wrong With Your Gas Heater or Furnace
You should probably Replace if: [ ] The repair costs more than 50% of a new unit. [ ] The furnace is over 15 years old. [ ] You have had to repair it more than once in the last 2 years.