How to Use a Chimney Balloon to Stop Drafts
A chimney balloon is an inflatable device that you insert into your chimney to block cold air drafts and prevent heat loss from your home.
You simply inflate the balloon inside your flue after measuring the opening, and it creates an airtight seal that stops unwanted airflow while saving energy costs.
What Is a Chimney Balloon and Why Use One?
Think of a chimney balloon as a giant cork for your fireplace. When you’re not burning wood, your chimney acts like an open window. Cold air rushes down while your expensive heated air escapes up the flue.
I found that most homeowners lose 14% of their heating costs through an open damper. That’s money flying right up your chimney every month.
Chimney balloons solve this problem by creating a complete seal. They’re made from durable plastic that can handle temperature changes and moisture.
How Much Money Can You Save?
Research shows that sealing your chimney can save $200 to $400 per year on heating bills. The exact amount depends on your home size and local energy costs.
A chimney balloon costs around $50 to $80. You’ll pay for itself in just a few months.
Tools and Materials You’ll Need
Getting started is simple. You don’t need special skills or expensive tools.
Required Items
- Chimney balloon (correct size for your flue)
- Measuring tape
- Flashlight or headlamp
- Inflation device (usually included)
- Removal handle (comes with most kits)
- Drop cloth or old towels
Optional but Helpful Tools
- Mirror to see up the flue
- Work gloves
- Knee pads
- Camera or phone to document the setup
Step 1: Measure Your Chimney Opening
Getting the right size matters. A balloon that’s too small won’t seal properly. One that’s too big might damage your flue.
Where to Measure
You’ll measure at the smoke shelf area, not the firebox opening. The smoke shelf sits about 6 to 18 inches above your damper.
Use your flashlight to look up past the damper. You’ll see where the flue narrows. That’s your target zone.
Taking Accurate Measurements
Measure both width and depth of the flue opening. Most residential chimneys range from 8×8 inches to 13×18 inches.
Round clay flue liners are also common. Measure the diameter if you have a round opening.
Write down your measurements. You’ll need them when ordering your balloon.
Common Flue Sizes
| Fireplace Width | Typical Flue Size | Balloon Size Needed |
|---|---|---|
| 24-32 inches | 8×12 inches | 9×12 inch balloon |
| 33-40 inches | 12×12 inches | 12×12 inch balloon |
| 41-48 inches | 12×16 inches | 12×16 inch balloon |
Step 2: Choose the Right Chimney Balloon
Not all chimney balloons work the same way. You want one that fits your specific situation.
Types of Chimney Balloons
Standard balloons work for most homes. They’re rectangular and fit square or rectangular flues.
Round balloons suit circular flue liners. Specialty balloons handle unusual shapes or very large openings.
Quality Features to Look For
I found that the best balloons have double-sealed seams. They resist punctures better than single-layer versions.
Look for balloons with reminder cards. These bright tags hang down into your fireplace. They remind you to remove the balloon before lighting a fire.
Material Considerations
Heavy-duty vinyl lasts longer than thin plastic. It costs a bit more but handles temperature swings better.
Some balloons include woolly covers. These add insulation value and protect against rough chimney surfaces.
Step 3: Prepare Your Fireplace and Chimney
A little prep work makes installation much easier and safer.
Clean the Area
Remove any debris from your firebox. Old ashes, leaves, or animals nests can interfere with balloon placement.
Check that your damper opens fully. You’ll need clear access to the flue opening.
Safety Checks
Make sure your fireplace is completely cold. Wait at least 12 hours after your last fire.
Look for sharp edges or rough spots in the flue. These could puncture your balloon.
When NOT to Install a Balloon
Skip the balloon if you smell gas. This could signal a gas leak that needs professional attention.
Don’t install if you see white staining on your chimney exterior. This might indicate moisture problems that need fixing first.
Step 4: Install Your Chimney Balloon
Now comes the main event. Take your time and follow each step carefully.
Position the Deflated Balloon
Reach up past your damper to the smoke shelf area. Place the deflated balloon in the center of the flue opening.
The balloon should sit snug against the flue walls on all sides. Don’t force it into a space that’s too small.
Begin Inflation
Most balloons come with a simple pump or inflation tube. Start pumping slowly and steadily.
Watch the balloon expand. It should press gently against all four walls of your flue.
How Much to Inflate
Stop when the balloon feels firm but not rock-hard. Over-inflation can damage both the balloon and your chimney.
You want gentle, even pressure against the flue walls. The balloon should hold its shape without bulging.
Final Positioning
Make sure the reminder tag hangs down into your firebox. This bright marker prevents accidental fires.
Check that air isn’t flowing around the edges. Hold your hand near the balloon to feel for drafts.
Step 5: Test the Seal
A good seal makes all the difference in energy savings. Here’s how to check your work.
The Tissue Paper Test
Hold a piece of tissue paper near your fireplace opening. With a proper seal, the paper shouldn’t move from air currents.
Try this test on a windy day for the most accurate results.
Visual Inspection
Use your flashlight to look around the balloon edges. You shouldn’t see gaps or spaces where air could pass.
The balloon should maintain contact with the flue on all sides.
Troubleshooting Poor Seals
If you feel air leakage, try adjusting the balloon position slightly. Sometimes moving it up or down an inch helps.
You might need a different size balloon if gaps persist. Don’t keep fighting with the wrong size.
Maintenance and Care Tips
Chimney balloons last longer with basic care and attention.
Regular Inspections
Check your balloon monthly during heating season. Look for signs of deflation or damage.
Cold weather can cause slight deflation. You might need to add a little air occasionally.
Cleaning and Storage
When you remove the balloon for fireplace use, wipe it clean with a damp cloth. Let it dry completely before storing.
Store deflated balloons in a cool, dry place away from sharp objects.
Signs You Need a Replacement
Replace your balloon if you see cracks, holes, or persistent deflation. Most balloons last 5 to 10 years with proper care.
Discoloration or brittleness also signals replacement time.
Removing Your Chimney Balloon Safely
Removing the balloon is just as important as installing it correctly.
Before Each Fire
Always remove your balloon before lighting any fire. The reminder tag helps, but double-check every time.
Grab the removal handle and pull gently. The balloon should deflate automatically as you pull.
Emergency Removal
If you forget and start a fire, the balloon will melt and fall into your fireplace. This creates smoke and unpleasant odors.
Extinguish the fire immediately and ventilate your home. Remove any balloon remains before using your fireplace again.
Making Removal Easier
Some people attach a longer cord to their balloon. This makes removal possible without reaching up the chimney.
Just make sure the cord doesn’t interfere with the balloon’s seal.
Common Problems and Solutions
Even with careful installation, you might run into issues. Here’s how to handle them.
Balloon Won’t Stay Inflated
Check for small punctures or valve leaks. Sometimes debris in the flue causes tiny holes.
Cold weather can also cause minor deflation. This is normal and usually doesn’t affect the seal.
Difficult Installation
If your balloon won’t fit properly, double-check your measurements. An incorrectly sized balloon causes most installation problems.
Rough chimney surfaces can make placement tricky. Consider a balloon with a protective cover.
Ongoing Draft Issues
Persistent drafts might indicate other problems. Check for gaps around your fireplace doors or damaged chimney caps.
Multiple air leaks require a complete fireplace inspection.
Alternative Draft-Stopping Methods
Chimney balloons aren’t your only option for stopping drafts.
Inflatable Dampers
These permanent installations sit above your existing damper. They offer convenience but cost more upfront.
Professional installation is usually required.
Top-Mount Dampers
Installing a damper at the top of your chimney stops drafts completely. This option works well for damaged throat dampers.
Expect to pay several hundred dollars for professional installation.
Why Balloons Often Win
Chimney balloons cost less and work immediately. You don’t need contractors or permits.
They’re also removable if you change your mind or move homes.
Conclusion
Using a chimney balloon is one of the simplest ways to cut your heating bills and improve home comfort. The installation takes about 30 minutes, and most homeowners can do it themselves with basic tools. Remember to measure your flue carefully, choose the right size balloon, and always remove it before lighting fires. With proper installation and care, your chimney balloon will provide years of draft protection and energy savings. The small upfront cost pays for itself quickly through reduced heating bills, making it a smart investment for any homeowner with an unused fireplace.
How long does a chimney balloon typically last?
Most quality chimney balloons last 5 to 10 years with proper care and seasonal removal. Factors like temperature fluctuations, chimney conditions, and balloon quality affect lifespan. Regular inspections help you spot wear before complete failure occurs.
Can I use a chimney balloon with a gas fireplace?
Never use chimney balloons with gas fireplaces or appliances. Gas units require constant ventilation for safety, even when not in use. Blocking gas appliance venting can create dangerous carbon monoxide buildup in your home.
What happens if I accidentally light a fire with the balloon installed?
The balloon will melt and drop into your fireplace, creating smoke and odors. Extinguish the fire immediately, ventilate your home, and remove all balloon remnants. Check your chimney for any remaining plastic before using your fireplace again.
Do chimney balloons work in very cold climates?
Yes, chimney balloons work well in cold climates and may provide even greater energy savings. Cold weather can cause slight deflation, so check your balloon monthly and add air if needed. Quality balloons handle temperature extremes without damage.
Can I install a chimney balloon if my damper is broken?
A broken damper actually makes chimney balloons more necessary since you have no other way to seal the flue. The balloon installation process remains the same whether your damper works or not. Just position it in the proper location above the damper area.
