• Most customers qualify for a $1,425 rebate through Focus On Energy*
    *Wisconsin homes only — not available in Illinois
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  • Injection Foam Wall Insulation · Southern Wisconsin

Warmer Winters.
Cooler Summers.

  • Injection Foam Wall Insulation · Southern Wisconsin
Veteran owned. Waukesha based. The owner does your estimate.
Your walls are the biggest uninsulated surface in your home. We fix that — and prove it — in a day or two, without tearing anything apart.

Most whole-home projects: $5,000–$12,000 before the $1,425 Focus on Energy rebate.* Whole-home jobs include a blower-door test and thermal scan.

Cozy Walls fills the empty, under-insulated walls of Wisconsin homes with injection foam. No gutting. No remodel. No dust storm. Drill, fill, patch, done — and you feel the difference the first cold night or the first hot day.
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262-592-5381

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No pressure. No sales script. Just Erik and real numbers.

  • Veteran Owned & Operated
  • $750** Military Discount
  • Lifetime Transferable Warranty
  • Focus on Energy® Trade Ally
  • Serving Southeast Wisconsin

**Discounts apply to whole-home projects with a minimum job size of $5,000. One discount per household.

What the day actually looks like

Real photos from Cozy Walls jobs in Southern Wisconsin this month. This is the whole process.

1. One row of siding comes off

We pop a single course of siding — no walls opened inside, no dust in your house.

2. Drill, fill, patch

Small holes in the sheathing, foam injected into every cavity, holes plugged. Most homes take one day; two-story homes or anything over 1,400 sq ft take two.

3. Siding goes back on

Same siding, same house. You would never know we were there.

4. Warmer that night

Whole-home jobs include a blower-door test and thermal scan so you can see the difference.

  • Reviews

What your neighbors are saying

★★★★★

“I have an older home from the early 1900s. It was drafty and I could hear road noise in my living room — until Cozy Walls did their thing. The noise reduction was the first thing I noticed. Erik was very informative and the Veteran Discount helped a lot. Already noticing a difference in my energy bill.”

Shawn F.  ·  Google review

★★★★★

“We just bought our first house and our bedroom was very cold — the furnace ran constantly. Cozy Walls insulated the whole house and garage and found most of our walls had no insulation left. Now the bedroom is much warmer and the furnace runs a lot less, saving us money.”

Austin B.  ·  Google review

★★★★★

“Erik was very knowledgeable. The sales process was painless. I noticed a difference in my home.”

Rod M.  ·  Google review

Read More Reviews on Google →

Your attic gets all the attention. But your walls are the largest surface area of your home's envelope — and in most older houses, they're the weakest link.

  • The Problem

If your house was built before 1990, there's a good chance your walls are running on empty.

Most Wisconsin homes were built with little or no wall insulation — or with cellulose and fiberglass that has settled, sagged, and quit doing its job decades ago. Insulation that settles leaves a gap at the top of every wall cavity. That gap is why:

One room never warms up no matter where you set the thermostat

Your A/C runs all day in July and still can't get the house below 79 — or your furnace can't hold 65 on a January night

You feel a draft sitting next to an exterior wall

Pipes in your exterior walls freeze on the coldest nights — and you're leaving faucets dripping in January hoping they don't burst

Some homeowners find actual frost on the inside of their walls on the coldest mornings — that's your heat escaping fast enough to freeze

Your furnace runs constantly from December through March

Your energy bills climb every winter while your comfort doesn't

  • The Fix

Injection foam: wall insulation for homes that are already built.

It’s the highest R-value you can put in your walls without tearing them out — and we install it from the outside in: no demolition, no drywall repair, no repainting your living room.

01

Inspect & Measure

The first thing we do is a blower door test — a hard number on exactly how much air your home is leaking right now. Then thermal imaging shows you where: the cold spots, the settled insulation, the voids. Before we quote a single dollar, you're not taking our word for anything — the camera and the numbers show you what's missing.

02

Access

We remove a course of siding (or drill discreet holes in masonry) to reach each wall cavity. Every stud bay gets checked — including the short ones over windows and doors that other companies skip.

03

Fill

Injection foam flows in as a shaving-cream consistency, filling the cavity completely — around wires, pipes, and blocking — then cures in place. And we keep the thermal camera out during the job, watching cavities fill in real time so nothing gets missed.

04

Finish & Prove It

Siding goes back on, plugs are sealed, and we clean up like we were never there. Then the last thing we do is the same as the first: a final thermal scan and a second blower door test — before and after, side by side — so you can see the difference in black and white, not just feel it on your heating bill. Most homes are done in a single day; two-story homes or anything over 1,400 sq ft take two.

See How It Works →
  • The Comparison

Not all wall insulation is created equal.

Swipe left or right to compare→
Injection FoamBlown CelluloseEmpty Walls
R-value✓Highest available without opening walls⚠Lower per inch — and drops as it settles×Near zero
Fills the entire cavity✓Complete fill, cures in place⚠Settles over time, leaving gaps×
Air sealing✓Seals as it fills×Air passes through×
Performance over time✓Doesn't settle or sag⚠Loses R-value as it compacts×
Moisture response✓Doesn't absorb & hold water⚠Can absorb moisture×
Sound dampening✓Noticeably quieter rooms⚠Partial×
Install disruption✓1–2 days, from outside✓Similar—
Cellulose was the best option available in 1985. It isn’t anymore. Foam fills every void, seals air leaks as it goes, and holds its performance for the life of your home.

"The neighbors' conversations through the wall. The dog barking on a Sunday when you're trying to sleep in. The lawnmower firing up at 7 a.m."

Not anymore. Foam-filled walls don’t just maintain your temperature — they swallow sound. Customers tell us the quiet is the first thing they notice, before the energy bills even arrive. Street noise fades, voices stop carrying, and your house finally sounds as solid as it should.
  • Rebates & Payback

Wisconsin will help pay for this.

The Focus on Energy® program understands the huge difference air sealing makes — that’s why they send incentives back in the mail, as a check made out to you: a minimum of $1,425 and up to $2,025 back in your pocket on qualifying wall insulation projects.* Cozy Walls handles the paperwork, the program requirements, and the filing. You just cash the check.

*Focus on Energy is a Wisconsin program. Rebates are not available on Illinois homes.

And we don’t ask you to take our word for the results. With a blower door test before and after your project, we measure exactly how much air your home was leaking — and how much tighter it is when we’re done. Our before-and-after tests routinely measure at least 25% less air leakage — and up to 50% — after foam injection. That’s not a brochure number; that’s a real measurement on real Wisconsin homes — and we’ll put one on yours.
Between rebates, lower monthly heating and cooling bills, and a furnace and A/C that don’t have to work as hard, wall insulation is one of the few home projects that quietly pays you back every single month. And there’s a longer payoff hiding behind the monthly one: equipment that isn’t running constantly wears out slower. Insulated walls mean fewer cycles, less strain, and more years before you’re writing a check for a new furnace or air conditioner.
Ask About Your Rebate →
Pay to the order of

You.

Program
Focus on Energy®
Rebate range
$1,425 – $2,025*
Measured air leakage cut
25% – 50%
Paperwork
Handled by Cozy Walls

*Focus on Energy is a Wisconsin program. Not available on Illinois homes.

Cozy Walls technician injecting foam wall insulation from outside a Wisconsin home
  • Who We Are

Veteran owned. Wisconsin operated. Zero shortcuts.

Cozy Walls is owned by Erik Hoffman — a retired Army Master Sergeant with 29 years of service and a standard the Army drilled in deep: strict attention to detail, and do it right the first time.
We’re not a franchise. We’re not a storm-chaser crew from out of state. We’re a local team that has insulated over 200 Wisconsin homes, tells you the truth about what your home needs, and stands behind the work. And when you call for an estimate, the person who shows up at your door is Erik — the owner, not a salesman.
Every job is backed by our Lifetime-of-the-Home, Transferable Warranty: the foam is warranted never to settle, sag, or lose performance for as long as your house stands — and if you sell, the warranty goes with the house to the next owner.

We salute those who serve:

$750** off

Anyone who has ever served in the United States Armed Forces — active duty, Guard, Reserve, retired, or veteran

$500** off

First responders

$500** off

Homeowners 60 and better

$500** off

Teacher Discount

Just ask for the military discount — no hoops, no fine print, no “active duty only.” If you wore the uniform, it’s yours.
**Discounts apply to whole-home insulation projects with a minimum project value of $5,000. One discount per project.
One discount per job — largest one applies.
  • Service Area

Proudly serving Southeast Wisconsin

Home base: Waukesha County — and everywhere around it.
  • Home Base — Waukesha County
Waukesha
Brookfield
New Berlin
Muskego
Pewaukee
Oconomowoc
Mukwonago
Milwaukee
  • And the counties all around us
Milwaukee, Jefferson, Dodge, Rock, Walworth, Racine, Kenosha, and eastern Dane County — and everything in between. Watertown to Janesville, Beaver Dam to Kenosha, if you’re in Southeast Wisconsin, you’re in our service area.
Not sure if we cover your town? Call us — if we can get the rig there, we can insulate it.
  • FAQ

Questions homeowners ask us most

How long does it take?
Most homes: one day. Two-story homes or anything over 1,400 sq ft: two.
No. We work from the outside — siding comes off, foam goes in, siding goes back on. Interior walls are only drilled in special cases, and we patch what we drill.
No problem — we can drill from the inside instead. We’ll fill each cavity through the drywall or plaster and leave you a rough patch at every hole. You handle the sanding, priming, and painting once we’re finished, and your exterior stays untouched.
Yes — masonry homes are drilled and filled, then sealed with new mortar to color match as close as possible.
We don’t. We drill through the mortar joints between the bricks with a 5/8-inch bit — a hole about the size of a dime. Your brick is never touched, and mortar patches far cleaner than brick ever could.
Most whole-home projects land between $7,000 and $12,000. What moves you within that range is square footage, number of stories, siding versus brick, and how much of the house has usable wall cavity. Focus on Energy rebates and any discount you qualify for come off that number. We give you a firm price after the inspection — not a range, not a ‘starting at.’
Yes — $750** off for anyone who has ever served in the United States Armed Forces: active duty, Guard, Reserve, retired, or veteran. Owned by a retired Army Master Sergeant, so this one’s personal.

**Discounts apply to whole-home projects with a minimum job size of $5,000. One discount per household.

This is one of the biggest reasons older Wisconsin homes call us. Pipes in exterior walls — bathroom and kitchen lines especially — freeze because cold air pours through the empty cavity around them. Injection foam fills that cavity and shuts off the air infiltration, dramatically reducing the freeze risk that has you leaving faucets dripping every January.
Never. We work all year round — the cold doesn’t affect the foam when we inject it into your walls, and neither does the heat. In fact, the dead of winter is when your walls need us most. If your driveway is passable, we’re working.
Yes. Injection foam is non-toxic once cured, Class 1 fire rated, and doesn’t off-gas into your living space.
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