A clean flue is the difference between a fireplace that draws properly and one that pushes smoke into your living room. Ace Chimney Service sweeps wood-burning fireplaces, inserts, and stoves across Crystal Lake and the surrounding McHenry County towns, seven days a week.
What chimney sweeping actually involves
Sweeping is not just running a brush up the flue. We start by looking at how the system is put together — the firebox, damper, smoke shelf, liner, and the crown and cap at the top — because the condition of those parts determines how much deposit has formed and why.
We seal the fireplace opening before anything else. A HEPA-filtered vacuum runs for the duration of the job, holding the firebox under slight negative pressure so soot travels into the vacuum instead of into the room. Rotary brushes and rods sized to your flue then work the deposits loose from the liner walls, top to bottom.
Once the flue is clear we clean the smoke shelf and firebox, check that the damper opens and seals, and carry the debris out. Then we walk you through what we found.
Why creosote is worth taking seriously
Every wood fire deposits unburned material on the inside of the flue. That residue passes through three recognisable stages. The first is a light, flaky soot that brushes away easily. The second is harder and more granular. The third is glazed creosote — a hard, shiny, tar-like coating that ordinary brushing will not remove and that burns hot and fast if it ignites.
Cool flue temperatures, restricted air, and unseasoned wood all accelerate the process. Older Crystal Lake houses with large masonry chimneys on an exterior wall are particularly prone to it, because the flue never gets warm enough to keep the smoke from condensing on the way up.
Signs your chimney is overdue
- Smoke rolling back into the room when you light a fire
- A sharp, tarry smell from the fireplace, strongest in humid weather
- Black, flaky, or shiny buildup visible above the damper
- Fires that are hard to start or that never seem to draw well
- Birds, squirrels, or nesting noise in the flue
- Fallen debris, grit, or masonry pieces in the firebox
Sweeping and inspection go together
A sweep is also the best opportunity to look at the system properly, which is why every visit includes a Level 1 inspection. Cleaning the flue is what makes a real inspection possible — you cannot judge the condition of a liner you cannot see. If we find cracked tiles, a failing crown, or a liner that is past its service life, you will hear about it with photographs rather than a sales pitch.
Where the flue turns out to be damaged, relining restores a safe, continuous path for the exhaust. Where water is getting in, the fix is usually at the top of the stack — see caps and crowns.
Serving Crystal Lake and the surrounding towns
We work out of Crystal Lake and cover the towns around it, from Lake in the Hills and Algonquin across to Cary, Woodstock, McHenry, and Huntley. Hours are 7am to 7pm, seven days a week, which means weekend appointments are ordinary rather than an exception — useful in October and November when everyone remembers the fireplace at once.
Booking early in the season is worth doing. By late autumn the schedule tightens considerably across McHenry County, and a chimney that needs repair before it can be used safely is better discovered in September than in December.
Call (815) 320-0883 to book, or use the online request form. Pricing for every service is listed openly on our pricing page.
Frequently Asked Questions
How often should a Crystal Lake fireplace be swept?
Once a year for anyone burning wood regularly. The NFPA recommends an annual inspection of every chimney, and sweeping whenever deposits build up. Homes that burn several cords each winter often need it more than once.
How long does a chimney sweep take?
A straightforward wood-burning fireplace usually takes about an hour. Add time if the flue is tall, heavily glazed, or if we find a blockage that has to be cleared before we can finish.
Will sweeping make a mess in my living room?
No. We seal the fireplace opening, run a HEPA vacuum the entire time, and put down drop cloths. A properly run sweep leaves the hearth cleaner than we found it.
What is creosote and why does it matter?
Creosote is the tar-like residue wood smoke leaves behind. It is flammable, and once it builds into a thick or glazed layer it is the single most common cause of chimney fires.
Do gas fireplaces need sweeping too?
They need service, though not the same brushing. Gas appliances still vent combustion byproducts, and the flue can collect debris, rust, or nests, so the venting still needs checking each year.
Can I burn wood I cut this year?
Not well. Green wood holds a great deal of moisture, burns cool, and produces far more creosote. Season hardwood at least six to twelve months before burning it.
What if you find a problem while sweeping?
We show you. Every sweep includes a Level 1 inspection, and if something is wrong you get photos and a plain explanation of what it means before any repair is discussed.
Do you sweep chimneys that have not been used in years?
Yes, and those are the ones worth checking most. Long-idle flues frequently hold animal nests, fallen masonry, or deteriorated liners that make the first fire genuinely risky.
Published: July 24, 2026