By James Rodriguez, Central Chimney Service.
August is the right month to deal with your chimney, because you are the only one asking. Once the first genuinely cold night hits the Chicago suburbs, every sweep in the area is booked two to three weeks out, and the problems that turn up are the same ones that were sitting there quietly all summer.
Why August beats October for chimney work
Book in August and you get your pick of dates instead of whatever is left. The practical advantage is repair time: if an inspection turns up a cracked crown or a liner problem, there are still weeks of dry, warm weather to fix it properly. Masonry work needs temperatures above roughly 40°F to cure correctly, so the same repair booked in November may have to wait until spring, leaving a fireplace you cannot safely use all winter.
Summer also makes problems easier to find. A chimney that has been sitting unused since March shows its water damage, its nesting, and its draft faults plainly, without a fire masking them.
What actually accumulates over a Bolingbrook summer
Three things, mostly. Moisture damage is the big one — our freeze-thaw cycles push water into brick and mortar, and by late summer you can see the spalling that started last winter. Animals are the second: chimney swifts, squirrels, and raccoons treat an uncapped flue as available housing, and a nest is both a blockage and a fire risk. Creosote is the third, and it does not evaporate over the summer; whatever glazed onto the flue walls in February is still there in August, absorbing humidity and producing the sour smell homeowners notice on muggy days.
Homes around Bolingbrook lean heavily toward 1970s-through-1990s construction, which means a lot of clay tile liners now reaching the end of a normal service life. Cracked tiles are not visible from the hearth — they turn up on a camera inspection, which is exactly the kind of finding you want in August rather than in December.
What a pre-season visit should include
A useful appointment covers more than a brush. It should include a level-appropriate chimney inspection of the flue, firebox, damper, smoke chamber, and crown; removal of creosote and any debris or nesting material; a look at the cap and flashing where most water entry begins; and a straight explanation of what is urgent versus what can reasonably wait a season.
That last part matters. Not every finding is an emergency, and you should be told which is which before any work is quoted. We give you the price up front, before anything starts.
What you can check yourself first
Plenty, without a ladder. Open the damper and confirm it swings fully and closes tight. Look up with a flashlight for daylight, nesting material, or a heavy black glaze. Put your hand near the opening with the damper open — no airflow at all suggests a blockage. Outside, look for crumbling mortar joints, a cracked crown, rust streaks below the cap, or staining on the interior wall or ceiling near the chimney chase, which usually means water is already getting in.
Our DIY chimney care guide walks through these checks in more detail. None of them replace an inspection, but they tell you how urgently to book one.
Booking before the rush
Central Chimney Service works across Plainfield, Bolingbrook, Naperville, Romeoville, and the surrounding towns, seven days a week from 7 AM to 7 PM. We are insured and bonded, and I have spent 29 years doing this work in this area — long enough to know which subdivisions have which chimney problems before I pull up. Pricing is published on our pricing page so you know the number before you call. Reach us at (815) 305-5510.
Frequently asked questions
How often does a chimney actually need sweeping?
Industry guidelines recommend an annual inspection, with sweeping based on what that inspection finds. A fireplace burning several cords of wood a season typically needs cleaning every year; one used a handful of times may go longer. The inspection is the annual constant — the sweeping depends on buildup.
Is it worth booking if we barely used the fireplace last winter?
Yes, because most of what an inspection catches is not soot. Water damage, animal entry, deteriorating mortar, and cracked liner tiles all progress whether or not you light a fire. A lightly used chimney can still fail an inspection on structural grounds.
How long does an appointment take?
A straightforward sweep and inspection usually runs about an hour to ninety minutes. Add time if there is heavy glazed creosote, a nest to remove, or a camera inspection of a suspect liner.
Will sweeping make a mess in the house?
It should not. The work is done with a sealed vacuum at the firebox opening and drop cloths over the hearth and surrounding floor. Fine dust is the thing to watch; a properly set up job contains it.
What does a chimney cap do?
It keeps rain, animals, and debris out of the flue, and its spark arrestor screen stops embers landing on the roof. It is one of the least expensive parts of a chimney system and prevents some of the most expensive damage, which is why a missing or rusted cap gets flagged immediately.
Why does the chimney smell worse in summer?
Humidity. Creosote deposits absorb moisture from humid air and release that sour, smoky odor, and a negative-pressure house pulls the smell indoors instead of up the flue. Cleaning removes the source; a cap and better draft handle the rest.
Can a cracked clay liner be repaired, or does it need replacing?
It depends on the extent. Isolated damage can sometimes be addressed with a sealing system, while widespread cracking or shifting tiles generally calls for relining. A camera inspection is what settles the question — nobody should quote a reline without having looked.
Do gas fireplaces need this too?
They do. Gas produces no creosote, but its exhaust is acidic and corrodes liners over time, and gas flues still collect debris and attract nesting. An annual check of the venting, logs, and connections is the standard for gas appliances as much as for wood.
Published August 9, 2026 · Last updated August 8, 2026