Closing Down the Fireplace for the Year in Palos Park
By Dan Joel, Elite Sweepers Inc.
The end of the burning season gets almost no attention. The last fire happens sometime in March, nobody declares it the last one, and the fireplace is simply not used again until autumn. That gap is when a chimney is least monitored and, as it happens, most vulnerable, because everything left in the flue sits there through a warm humid summer.
Why the off-season is when damage happens
The short answer: creosote left in a flue absorbs moisture, and moisture is corrosive.
Creosote is acidic. Left in place through months of humidity, it takes on moisture and attacks the flue lining, the mortar joints and any metal component it touches. It is also the reason for the sour smell that shows up in July in houses where nobody has thought about the fireplace since winter. A flue swept in spring goes into summer clean; one swept in autumn spends the whole summer with the deposits in it.
That is the strongest argument for a spring sweep, and it is why our schedule is usually more open then, which suits everyone.
The end-of-season list
The short answer: clear the ash, close the damper, check the outside, and book the sweep.
- Remove the ash properly. Wait several days after the last fire, use a metal bucket with a metal lid, and set it outdoors on a non-combustible surface away from the house. Embers stay live far longer than the pile feels warm.
- Close the damper, once the ashes are cold. An open damper vents your air conditioning up the chimney all summer, the same way it vents heat all winter. Never close it while anything is still warm.
- Check the exterior while the weather is good. Cap present and level, crown free of visible cracks, mortar joints on the weather side, and no brick or mortar debris on the ground.
- Deal with the wood. Move any remaining firewood away from the house rather than leaving it stacked against the siding, and stack next winter’s supply now so it has a full season to dry.
- Book the sweep and inspection. Spring and summer availability is better, and any masonry repair found has the whole warm season to be completed.
The repair timing argument
The short answer: exterior masonry work needs warm dry weather, and finding the problem in spring gives you the entire season.
This is the practical case for not waiting until autumn. Mortar, crown sealant and flashing compounds all need moderate temperatures and dry conditions. A problem found in spring can be scheduled comfortably. The same problem found in October is a race against the first hard freeze, and one found in December waits until spring while the chimney spends the winter taking on water through the opening you now know about. Our chimney repair page covers the masonry side, and chimney caps and crowns the top of the system.
What summer does to an unswept flue
The short answer: the smell, and quiet deterioration.
Warm humid air moving across creosote releases odor, which is why the complaint peaks in July and August. Meanwhile the acidic deposits continue working on the liner and the damper. Neither is dramatic on any given day, and both are avoided entirely by sweeping at the end of the season rather than the start of the next one. Our chimney sweeping page covers the visit, and chimney inspection covers what gets evaluated alongside it.
For local scheduling, see our chimney service in Palos Park, the full list of services, and our pricing page for costs. Elite Sweepers Inc is insured and bonded, works seven days a week from 7 AM to 7 PM, and gives you the price up front. Call (708) 432-3977.
End-of-Season Questions
Is it better to sweep the chimney in spring or fall?
Spring has real advantages. It removes acidic creosote before it sits through a humid summer absorbing moisture, it avoids the summer odor problem, and any masonry repair found has the whole warm season available.
Should I close the damper for the summer?
Yes, once the ashes are completely cold. An open damper vents conditioned air up the chimney in summer just as it vents heat in winter. Never close it while anything in the firebox is still warm.
Why does my fireplace smell in the summer?
Warm humid air moving across creosote deposits releases far more odor than cold dry air does. A flue swept at the end of the burning season has far less left in it to produce that smell.
How long should I wait to remove ash after the last fire?
At least a full day and preferably several. Ash insulates the embers beneath it, so a pile that looks grey and feels cool can still hold live coals well below the surface.
Should firewood be stacked against the house?
It is better kept away from the structure. Wood stacked against siding holds moisture against the house and provides shelter for insects and animals right at the wall.
When should I buy next winter’s firewood?
As early as you can. Most hardwood needs about a year after splitting to season properly, and oak often needs two, so buying in autumn for that same winter usually means burning wood that is not fully dry.
Does the chimney need anything else over the summer?
Mainly that it stays capped and the crown stays sound, since summer storms drive rain into the masonry. A look at the exterior while the weather is good is worthwhile, and it is easier then than in November.
Can I book a sweep outside the busy season?
Yes, and availability is generally much better. We work seven days a week from 7 AM to 7 PM year-round, and spring and summer appointments are usually easy to schedule at a time that suits you.
Published October 5, 2026
