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Air Leaks From Furnace: Why And How To Fix It?

Air Leaks From Furnace: Why And How To Fix It?

Your home’s furnace is a crucial component. Is it typical for it to leak air, though? Do you worry that it may be affecting your heating effectiveness? Don’t worry; we have taken the time to provide you with the solution to that query in this article.

A furnace that is leaking air is unfortunate since it is an issue. Your furnace may be inefficiently leaking air, which can reduce the amount of energy used by your home. It may be the result of subpar manufacturing, faulty installation, or general wear and tear if your furnace is leaking air.

Home problems are never enjoyable. However, you must take prompt action if your furnace is having problems, such as air leaking. We’ll talk about how to fix air leaks from your furnace in this article. Continue reading as we also look at the furnace replacement warning indicators.

Should Air Leak From My Furnace?

Air Leaks From Furnace: Why And How To Fix It?

Understanding the distinction between an airtight and a well-sealed furnace is crucial. The most effective and best furnaces are airtight. Even if your furnace is airtight, you can still anticipate some air leakage.

However, your furnace will operate less effectively if it is not built to allow for a little amount of free-flowing air leakage.

Let’s look at what causes an air leak in a furnace:

Incorrect Manufacturing
The parts in your furnace may have been broken or distorted during production if it wasn’t built properly. As a result, the furnace may experience a buildup of pressure and air leaks may result.

We advise getting in touch with a pro if you think your furnace was not made correctly. Your home technician can look at your furnace and tell whether or not it was made appropriately.

Faulty Installation
It’s likely that an erroneous installation occurred when your furnace was set up if you purchased it a few years ago. You should get in touch with a specialist to check your furnace for any potential harm because the furnace was placed incorrectly.

You might be entitled to damages if the technician determines that your furnace’s incorrect installation led to it developing pressure or breaking.

Timely Wear And Tear
Your furnace will start to lose efficiency over time. This might lead to it disintegrating and leaking air. We advise that you get in touch with a professional if you think that the problem with your furnace is the result of wear and tear over time.

Your furnace can be checked by a home expert for damage, leaks, or malfunctioning parts.

How Can An Air Leak In A Furnace Be Fixed?

Air Leaks From Furnace: Why And How To Fix It?

Either silicone caulk or a foam-type sealant are necessary to repair a furnace air leak.

If your furnace is connected to a vent pipe, you must block it off in three distinct places. The first is where the duct and exhaust fan connect.

The second location is just adjacent to the exhaust fan, up at the duct’s top. You must inspect another duct segment if you do not see any damage or leaks in this region.

Just below where the exhaust fan joins the furnace is the third place that needs to be sealed. Only by standing on a ladder and peering down can you see this, which is normally close to the floor.

Check a nearby wall if your furnace is not dripping through a vent pipe. You should start by looking for any openings between the furnace and the floor. By angling your view downward while perched on a ladder close to the furnace, you may see this area.

You must go to the next portion of the wall where your vents attach if there are no gaps.

If you don’t notice any leaks or damage but still hear a lot of noise coming from your furnace, it’s probably because some parts inside it aren’t working properly.

How Much Does A Leaking Furnace Cost To Repair?

Air Leaks From Furnace: Why And How To Fix It?

Depending on the problem and the amount of the repair, the cost to fix a furnace leak might vary greatly.

The cost to hire a professional to fix an air leak in your furnace might range from $200 to $1,500. Since replacement will make more sense than repair, the expert might even advise doing so. In most circumstances, replacing your furnace rather than chasing repair bills if it is more than 15 years old makes more sense.

How Can I Tell If My Furnace Needs Repair?

There are a number of indicators that your furnace is broken:

The Boiler Is More Than Fifteen Years
Your furnace probably needs to be replaced if it is older than 15 years. An older item won’t function as effectively as a newer one and may even entirely malfunction, necessitating a costly repair quote. Even though some furnaces can endure for more than 20 years, their efficiency will decline with time.

People In Your Home Are Frequently Ill
People can become ill when the air quality in their homes is inadequate.

For instance, if you observe that a member of your family frequently suffers from allergies or respiratory problems indoors but not outside, it may be because the home is not properly ventilated.

Home With High Humidity
Your house should maintain a humidity level of 30% to 50%. The air may become hot and humid if there is an excess of moisture.

Condensation develops on the interior of your windows as a result, which encourages the formation of mould. This may aggravate someone’s allergies or asthma, but it also poses a risk to your house.

Strange Dust Around Your Home
When dust builds up more quickly than you can remove it, there may be a health issue. If your furnace isn’t operating properly, any pets or kids playing on the floor will be inhaling in dust particles that contain chemicals. Respiratory problems and possibly an allergic reaction may result from this.

Water Is Leaking From The Furnace
If water is dripping from your furnace, there can be an interior issue. To ascertain what is wrong with the device, the expert will need to perform a more thorough inspection.

Increasing Electricity Cost
If you see a significant spike in your electric bill, there are a few potential causes.

An increase in temperature could be the first explanation. Your energy statement will reflect any additional usage for heating or cooling. If there is a problem with the furnace, it would be the second explanation. The furnace may run longer if you notice that your house is consistently cooler than it should be.

Strange Noises From The Furnace
There could be a problem if you hear an odd noise coming from your furnace. The unit’s internal workings could be deteriorating or it could be something as simple as a loose motor or fan. In either case, the furnace will probably need to be replaced shortly.

Furnace Has A Yellow Pilot Light
Your furnace’s pilot light flashing or turning yellow could be a sign that something is wrong with the appliance. To pinpoint the precise issue, the expert would need to do a more thorough examination of the furnace.

Furnace Is Blowing Warm Air
When your furnace produces warm air instead of hot air, there is definitely a problem. The expert must examine the device to determine the precise source of the issue.

How Do I Know If My Furnace Is Leaking Carbon Monoxide?

A gas smell is one of the most important indicators that your furnace is leaking carbon monoxide. When the furnace is operating, a gas-like smell could indicate a carbon monoxide leak in your home.

If you get unexplainable headaches or nausea at home, this is another indication that your furnace is leaking carbon monoxide. This indicates that there is likely too much carbon monoxide present, and it has entered your home. Because of how deadly this is, you need to take carbon monoxide risk extremely seriously. Purchase a CO2 detector to safeguard you and your loved ones.

How Long Are Furnaces Typically Good For?

Furnaces typically endure 15 to 20 years. Of course, there are a variety of variables, including usage, brand, model, and climate. If your furnace hasn’t been properly maintained, its age could be a problem. A specialist can determine what upkeep is necessary for the appliance to operate properly.


In conclusion, if your furnace is leaking air and you’re not sure what to do, call a technician. They’ll be able to identify the precise problem and provide you with a reasonable estimate. Additionally, if the furnace has not had the proper maintenance over the years, this could result in an earlier breakdown.

Air Leaks From Furnace: Why And How To Fix It?

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Written by HVAC Contributor

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