0Homeowners Exposedto Comfort.
Aggregate across 487 verified projects
From attic blow-in to basement spray foam — we seal the drafts, drop the bills, and finish on the day we said we would.
Latest Project
Attic Blow-In · Oak Park, IL
Heating bill down $194/mo
The draft died.
Here's what they felt next.
"I'd been cold in my own living room for six winters. After the attic blow-in, the first thing I noticed was the silence — then I realized I couldn't feel the draft from the ceiling anymore. January bill came in $178 lower than last year."
Margaret T.
Andersonville, Chicago
"They showed up at 7:45 for an 8 o'clock start and were packed up by 3. My contractor said that doesn't happen. It happened."
Darnell W.
Oak Park, IL
"The crawlspace was the source of every draft and every high bill. Seal sealed it — literally. We've run the heat less since October than we did any October since we bought the house."
Sofia R.
Evanston, IL
"As a property manager with 14 units, I needed someone who could work in occupied buildings, communicate professionally, and not leave a mess. Three for three."
James K.
Lincoln Park, Chicago
"The rim joist work took four hours. The heating savings started the same day. I didn't know a four-inch layer of foam could change everything."
Patricia N.
Berwyn, IL
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The numbers don't
need a sales pitch.
Real before/after data from verified Seal projects. Averages drawn from 487 completed installations across the Chicago metro.
Closed-cell spray foam applied to rim joists — Oak Park project, January 2026
Monthly Heating Bill
Attic blow-in · 2,100 sq ft home · Chicago, IL
Floor Surface Temp
Crawlspace encapsulation · Evanston, IL
Daily Furnace Runtime
Rim joist spray foam · Oak Park, IL
Attic R-Value
Dense-pack cellulose upgrade · Berwyn, IL
Average savings of 34% on annual heating costs across all 2025 Seal projects.
Start With a Free AuditYou can't hear the wind.
That's the point.
"We live two blocks from the L. Before the wall insulation, I could recite the train schedule by sound. Now I have to check my phone. I'm not exaggerating."
Keisha B.
Wicker Park, Chicago
"The garage fire-block work was done in three hours. The GC called it the cleanest sub work he'd seen on the job. That's the kind of thing that gets you referrals."
Tom H.
General Contractor, Naperville
"My upstairs neighbors' footsteps used to wake me up. Seal did the ceiling cavity work in one day. First night of real sleep in two years."
Amara O.
Bucktown, Chicago
"Seven rental units. Four of them had tenant complaints about cold floors and high bills. After the crawlspace work, all four renewed their leases. That's the ROI."
David C.
Property Manager, Oak Park
"I'm a structural engineer. I know what good work looks like. Seal's vapor barrier installation was textbook — clean, continuous, properly lapped. These guys know what they're doing."
Priya M.
Structural Engineer · Lincoln Square
"The house feels like a different building. I keep walking into rooms expecting to feel the cold air coming through the floor and it's just — gone."
Robert F.
Beverly, Chicago
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Secondary Path
Download Our R-Value Guide
A 12-page field reference covering recommended R-values by climate zone, material comparisons, and the questions to ask before any contractor shows up.