Some of the dangers of an old furnace are: Carbon Monoxide Poisoning: Arguably the biggest danger of an old gas furnace is carbon monoxide poisoning. Carbon monoxide is an odorless and colorless gas that can cause nausea and dizziness. Overexposure to this gas is deadly.

In respect to this, can old furnace cause health problems?

Respiratory Problems An old furnace that isn't working properly can cause dust, mold, and other pathogens to flow into your home. This can worsen asthma and cause other chest related illnesses to pop up. The air quality in your home is extremely important, so speak up if you notice an increase in these symptoms.

Likewise, can an old furnace explode? The major danger of fires from home heaters doesn't come from furnaces, but from space heaters. Although it is possible for a gas furnace to either catch fire or explode, it's highly unlikely. If there is a danger of this happening, the furnace will usually simply shut off—as it's designed to.

Subsequently, question is, what is the average life expectancy of a furnace?

Average Furnace Lifespan While some furnaces can last over 40 years (extremely rare), the average lifespan of a typical gas furnace is around 15-30 years. As long as you have scheduled yearly furnace maintenance, your furnace should easily last over 15 years.

Are furnaces dangerous?

Gas furnaces can develop leaks and cracks over time that allow deadly carbon monoxide gas to escape into the home. Older gas furnaces pose an even greater risk. And because carbon monoxide is colorless and odorless, it is impossible to detect until you start feeling symptoms.

Related Question Answers

How efficient is a 20 year old furnace?

20yearold furnaces have an annual fuel utilization efficiency, or AFUE, of 78% or less, according to the U.S. Department of Energy. AFUE is the basic energy efficiency rating system used in the HVAC industry.

How do you know when your furnace needs to be replaced?

8 Telltale Signs Its Time to Replace Your Furnace
  1. The Age of Your System.
  2. Rising Energy Bills.
  3. Excessive Dust, Dirt, Soot or Rust Particles.
  4. Home Humidity Problems.
  5. Rooms are Heating Unevenly.
  6. Furnace Becomes Unusually Noisy or Develops Rattles, Buzzes or Hums.
  7. Furnace Has Visible Signs of Rust or Cracks in or Around System.
  8. Frequent Repairs.

Can a furnace last 30 years?

Some sources report the average lifespan of a gas furnace to be only 15 years. Even though furnaces can last 30 years or beyond, most experts recommend that you start shopping for a new furnace when your existing unit is 15 years old.

Can you get carbon monoxide poisoning if your furnace is off?

Technically, your system won't produce carbon monoxide if your furnace is not running. Many of these tragedies occur when a furnace is on, but problems can also arise when an appliance is off but not properly vented. Carbon monoxide is a poisonous gas that has no color, odor or taste.

Can a furnace make you sick?

Carbon Monoxide Poisoning

This leads to symptoms such as dizziness, fatigue, headache, nausea, and irregular breathing. Exposure to a high level could be life-threatening. To avoid carbon monoxide poisoning caused by your heating system, have your furnace properly installed and inspected periodically by a professional.

How do you know if your furnace is dying?

Signs may be frequent headaches, a burning feeling in nose or eyes, nausea, disorientation, flu-like symptoms. If you experience any of these symptoms, air out your house, open a window to the furnace room and immediately call a gas service technician.

How efficient are old furnaces?

Furnace efficiency is measured in AFUE (annual fuel utilization efficiency), which determines how efficient the appliance is in converting fuel to heat. Furnaces that are a couple of decades old have an AFUE rating of around 60 percent – meaning that 60 percent of the fuel becomes heat, and 40 is lost.

Why does my furnace filter gets black really quick?

Carbon monoxide: This odorless, invisible gas is the byproduct of incomplete combustion and can cause soot deposits on your furnace filter. This can transfer to the dirt and dust collected on the furnace. If left wet long enough, black, sooty mold can begin to grow and spread to the furnace filter.

How do I know if my furnace flame sensor is bad?

Signs of a bad furnace flame sensor are:
  1. The furnace lights but then shuts down after a few seconds (short cycles)
  2. The porcelain on the flame sensor is cracked.
  3. The flame sensor is sooty or corroded.

Do furnaces lose efficiency over time?

Over time, it's common for a furnace to lose efficiency, due to age, as well as wear and tear. But, there are several things you can do to improve efficiency in your furnace, which will improve heating and result in lower bills.

What is the average life of a furnace and air conditioner?


The average life expectancy of an air conditioner or heat pump is 10–12 years. The average life expectancy of a furnace is 15–20 years.

How much does it cost to replace the furnace?

The national average cost of a standard efficiency natural gas furnace ranges from $2,150 to $5,900 with most homeowners paying around $3,100. The price may vary based on brand, complexity of install, and the efficiency of the new unit. Get free estimates from furnace replacement pros near you.

What brand furnace is most reliable?

Here's a quick roundup of some of the best furnace brands on the market today:
  • American Standard Furnaces. American Standard furnaces units are one of the most reliable brands in the business.
  • Amana Gas Furnace Units.
  • Bryant Furnaces.
  • Carrier Furnaces.
  • Daikin Furnaces.
  • Goodman Gas Furnaces.
  • Lennox Furnaces.
  • Rheem Furnaces.

Can you install a furnace yourself?

Gas Supply:

Although people tend to be afraid of working on gas piping (after all, you can blow up your entire house if you get just the perfect gas leak and ignite it), it is easier than ever and quite rewarding to do yourself. An existing furnace will already have a gas line, complete with shutoff.

How often should you change your furnace filter?

A good rule of thumb is to change 1-2 inch filters every three months, 4 inch filters every six months and 5 inch filters every 12 months. Signs your air filter needs changed: The filter is visibly dirty. Certainly if you can't see the material of the filter itself, it should be replaced.

Should I replace furnace before selling house?

A new furnace is attractive to buyers. If your furnace is old and you're looking to sell quickly it might be a good idea to replace it. It may be the cherry on top that a buyer needs to put in an offer. If the house needs other repairs or renovations anyway, an old furnace probably won't be much of a concern.

How do I know if my furnace is leaking carbon monoxide?

Other possible signs of carbon monoxide are: Streaks of soot around furnace; Absence of an upward draft in your chimney; Excess moisture found on windows, walls, or other cold surfaces; Excessive rusting on flue pipes, other pipe connections, or appliance jacks; Small amount of water leaking from the base of the

Can your furnace catch fire?

Furnaces are pretty safe, but they can catch on fire. One way a furnace can catch on fire is if there is a problem with the blower motor. It doesn't happen a lot, but blower motors can stop working for some reason and cause the furnace to overheat.

How long do electric furnaces last?

20-30 years