Why does my Buffalo fireplace only smell in summer?

Warm, humid outside air against a cool flue reverses the airflow, so the chimney draws into the house instead of out of it. Buffalo summers are warm and humid, and lake moisture keeps things damp, which is a bad combination with creosote. In winter, a hot flue pushes that air the other way and you don't notice it.

Will sweeping alone fix the smell?

Often it fixes most of it, because the creosote is usually the smell. But if water is still reaching the flue through a cracked crown, a missing cap or failed flashing, the odor tends to come back. That is why the moisture path gets checked at the same time.

Could this smell be carbon monoxide?

Carbon monoxide has no smell of its own, so an odor is not the test. If anyone in the house has headaches, dizziness or nausea, treat it as carbon monoxide, get everyone outside and call 911. Don't wait to see if it passes.

My chimney was built for coal. Does that matter?

It can. A lot of Buffalo's pre-1940 housing has masonry chimneys originally built for coal or older gas appliances, and they may be unlined or lined with clay tile. The inspection covers what condition that liner is in and whether it suits what you're burning now.

Do you do the work yourselves?

No. One Call Chimney is a referral and scheduling service that arranges chimney work with independent sweeps and masons across all fifty states — we are not the contractor and we do not perform the work. We line up the visit, and the technician who comes out handles the inspection and the job.

Smells of smoke or damp in Buffalo, NY

If your fireplace smells of old smoke, soot or damp basement, the smell is usually the creosote itself. Creosote is the tar-like deposit that burning wood leaves inside the flue. It sits there all year, and when moisture gets to it, it gets strong. A nest, leaves or animal debris in the flue can add to it, and so can water finding its way in through a cracked crown, a bad cap or failed flashing.

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The reason it gets worse in summer is airflow. Warm, humid air outside and a cool flue inside reverse the direction the chimney wants to move air, so instead of drawing up and out, the chimney breathes into the house. Buffalo summers are warm and humid, and Lake Erie keeps moisture around, so that reversal is common here. Buffalo also has some of the oldest housing stock in the country — large numbers of pre-1940 homes with near-universal basements and masonry chimneys, many originally built for coal or older gas appliances. Add the repeated freeze-thaw cycles that run from November into March and you get spalled brick, failing crowns and tired liners that let water into a flue that already holds decades of deposits.

While you wait — please don't

If anyone has headaches or nausea, get outside and call 911. A smell paired with headaches, dizziness or nausea means carbon monoxide until proven otherwise, and that is not something to test from indoors.
Don't mask it and move on. Shutting the damper and adding air freshener hides the smell but leaves a flue that may still be full of fuel.
Don't light a fire to burn the smell off. If you suspect a blockage, a nest or a damaged liner, stop using the fireplace until someone has looked up it.
Don't seal the top of the chimney yourself. Capping or wrapping a flue without dealing with where water is getting in can trap moisture inside the masonry and make the odor worse.

What the technician does

Sweeping the flueSince the smell is usually the creosote, the deposits come out first. That alone removes most of the source in a lot of houses.
Finding the moisture pathThe technician looks at the cap, the crown and the flashing to see where water is reaching the flue. Wet creosote smells far worse than dry creosote.
Clearing nests and animal debrisBird nests, leaves and droppings rot and smell, and they also block draft. Anything found in the flue gets removed.
Sorting out the damperA damper that won't close lets the chimney breathe straight into the room. It can be repaired, or a top-sealing damper can be fitted at the top of the flue to shut the column of air off from above.
Looking at house pressureExhaust fans, dryers and a tight house can pull air down the chimney. The technician considers how your house moves air before blaming the flue alone.
Explaining findings before anything startsYou get a free estimate — the technician inspects the chimney and gives the price before any work begins, and you approve it first. Ask to see the camera footage and ask for the reasoning in writing.

Why this happens in Buffalo, NY

Buffalo's brick and stone chimneys take a real beating. Deep freezes and repeated freeze-thaw cycles are routine here, and that is what produces spalled brick, cracked crowns and deteriorated liners. Those same faults are the moisture path that turns a quiet flue into a smelly one. Homes in Allentown, North Buffalo, South Buffalo and Kaisertown often have century-old masonry chimneys that were built for coal or older gas appliances, and many are still active venting flues rather than decorative features. Heavy lake-effect snow and drifting ice can also bury or cap a chimney top, which changes how the flue breathes.

Timing follows the weather. Work here spikes in October and November as people get ready for the heating season, again after big snow and ice events from December through February, and during the spring thaw when freeze damage to masonry finally becomes visible. A summer smell is actually a useful early warning — it often points at a crown, cap or flashing problem you would rather fix before the next winter. On paperwork: New York has no statewide chimney sweep license, and permits for chimney work are issued locally by the municipal building department, not by a state agency. Routine sweeping and inspection generally don't need a permit, but relining as part of an appliance installation or masonry rebuilding above the roofline usually does. Call the local building department before that kind of work starts.

Questions people ask

Why does my Buffalo fireplace only smell in summer?: Warm, humid outside air against a cool flue reverses the airflow, so the chimney draws into the house instead of out of it. Buffalo summers are warm and humid, and lake moisture keeps things damp, which is a bad combination with creosote. In winter, a hot flue pushes that air the other way and you don't notice it.
Will sweeping alone fix the smell?: Often it fixes most of it, because the creosote is usually the smell. But if water is still reaching the flue through a cracked crown, a missing cap or failed flashing, the odor tends to come back. That is why the moisture path gets checked at the same time.
Could this smell be carbon monoxide?: Carbon monoxide has no smell of its own, so an odor is not the test. If anyone in the house has headaches, dizziness or nausea, treat it as carbon monoxide, get everyone outside and call 911. Don't wait to see if it passes.
My chimney was built for coal. Does that matter?: It can. A lot of Buffalo's pre-1940 housing has masonry chimneys originally built for coal or older gas appliances, and they may be unlined or lined with clay tile. The inspection covers what condition that liner is in and whether it suits what you're burning now.
Do you do the work yourselves?: No. One Call Chimney is a referral and scheduling service that arranges chimney work with independent sweeps and masons across all fifty states — we are not the contractor and we do not perform the work. We line up the visit, and the technician who comes out handles the inspection and the job.

One call

One call to (866) 576-7943 sets up a visit for your Buffalo chimney, and the estimate is free on every job. The technician inspects the chimney and gives you the price before any work starts, and nothing happens until you approve it.

Call now · (866) 576-7943

Something else in this area

One Call Chimney arranges the visit; the technician does the work and gives you the price.