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TRUSTED BY JANESVILLE, WI HOMEOWNERS

  • Average homeowner rating star icon3.7
    Average homeowner rating
  • Verified reviews icon57
    Verified insulation services reviews

Verified Reviews for Insulation Service pros in Janesville, WI

*The Angi rating for Insulation Service companies in Janesville, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Insulation Service needs.

*The HomeAdvisor rating for Insulation Service companies in Janesville, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Insulation Service needs.

Last update on January 04, 2026

Top-Rated Insulation pros in Janesville - Updated Nov 2026

Avatar for USA Insulation of Madison
USA Insulation of Madison
4.9(
50
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - InstallBatt, Rolled or Reflective Insulation - Install or Upgrade+1 more

Serving Janesville, WI and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Credit card accepted

"The company does installation of insulation. But it does not do removal of existence contaminated insulation."
Foam insulating a wall
USA Insulation Premium Foam
Attic Insulation
USA Insulation Blown Fiberglass
Arkdale, WI

+24

Response time1 day
Response rate100%
58 neighbors recently requested a quote
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Avatar for Elite Insulators
Elite Insulators
4.8(
21
)
Injection Insulation - InstallSpray Foam Insulation - Install

Serving Janesville, WI and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

"Kyle wen above and beyond my expectations! Very professional and knowledgeable! Every business should have someone like Kyle. I would highly recommend Elite Insulators. I have other projects coming up and he is already hired! Lol! THANK YOU Kyle!!"
Cathedral Ceilings
Ceiling/Wall
Walls
Amish Ice Box
Amish Ice Box

+56

Response time2 days
Recommended by57%of homeowners
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Avatar for Koala Insulation of Madison
Koala Insulation of Madison
5.0(
7
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - InstallBatt, Rolled or Reflective Insulation - Install or Upgrade

Serving Janesville, WI and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

At Koala Insulation of Madison, we’re all about making your space more comfortable and efficient. We believe in doing things right, with a personal touch that sets us apart. From top-notch products like spray foam insulation to friendly service, we’re here to help you achieve the perfect insulation solution for your home or business.\n\nDiscover why our customers love working with us and how we can make a difference for you!\nGet a Free Estimate\n

Waunakee Attic
Prep work
Response time1 day
43 neighbors recently requested a quote
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Avatar for Cozy Walls Foam Insulation
Cozy Walls Foam Insulation
5.0(
5
)
Spray Foam Insulation - InstallBlown-In Insulation - Install or UpgradeInjection Insulation - Install

Serving Janesville, WI and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

Real measurements. Thermal imaging. The owner at your door. Zero pressure.\nTell us about your house and Erik will call you back to set a time. The estimate is free everywhere we work, and it comes with proof — not a guess over the phone.

External Injection
External Injection
External Injection
External Injection
Re-caulking after the siding is put back on

+7

8 neighbors recently requested a quote
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Avatar for Hawx Insulation- Milwaukee
Hawx Insulation- Milwaukee
4.1(
361
)
Blown-In Insulation - Install or Upgrade

Serving Janesville, WI and surrounding areas

Approved

In business since 2013

Free estimates

Credit card accepted

At Hawx Pest Control, our company is based on the belief that our customers' needs are of the utmost importance. Our team is committed to meeting those needs. Hawx Premium Pest Control will treat your pests, mosquitos, and more- then keep them away for good. If pests come back between treatments so will we, at no additional cost to you. We welcome the opportunity to earn your trust and deliver you the best service. No job is too big or too small for our experienced team. Call today for a quote. \n

8 neighbors recently requested a quote
Recommended by75%of homeowners
Request Quote
Avatar for Saunders Insulation Specialists
Saunders Insulation Specialists
3.1(
305
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - InstallBatt, Rolled or Reflective Insulation - Install or Upgrade

Serving Janesville, WI and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Saunders installed a bath exhaust fan and light as well as attic insulation for us. Very professional and efficient - a timely installation, performed very soon after contract was written. Great people to work with and great cleanup after. Highly recommend. Also Home Advisor worked well; contact was made within hours of submission."
Response time7 hrs
25 neighbors recently requested a quote
Recommended by58%of homeowners
Request Quote
Avatar for Larson Home Services
Larson Home Services
5.0(
5
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - Install

Serving Janesville, WI and surrounding areas

Approved (Corporate)

In business since 2020

Free estimates

Credit card accepted

"Salesman was very professional. Showed up in a vehicle worth the name on the side and in a uniform. Made a video of the bad area of our gutters and explained in detail what problems this would cause and had a very good presentation about the company and product."
Response time2 hrs
5 neighbors recently requested a quote
Recommended by75%of homeowners
Request Quote
Avatar for Modern Exterior
Modern Exterior
4.5(
31
)
Blown-In Insulation - Install or Upgrade

Serving Janesville, WI and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"Excellent company ! Prompt customer service, great value, answered all of our questions. Yard was spotless after completion of the new roof. We have referred Modern exterior to our friends and family."
New roof installed
Completed Roof and Skylights Project
Ridge vent replacement completed
New vent being installed
New home with new gutter gguards

+600

Response time5 hrs
Response rate99%
199 neighbors recently requested a quote
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Showing 1-10 of 33
Insulation FAQs, answered by experts

The lifespan of insulation depends on the material type. Fiberglass can last between 80 and 100 years, but it is important to start checking it around the 15-year mark. Spray foam has a lifespan of up to 100 years, and mineral wool can last up to 100 years. Cellulose, an eco-friendly option, has a lifespan of 20 to 30 years.

For standard 2x4 walls, the ideal insulation has an R-value between R-13 and R-15. This level of insulation, typically around 3.5 inches thick, fits well within the wall cavity. Common options include fiberglass batts and spray foam. The best choice for your home can depend on your climate; use R-value maps, like those from Energy Star, to determine the recommended level for your region. For colder climates, you might also consider adding exterior insulation for greater efficiency. Always check with your local building codes to ensure you meet any required standards.

Yes, PEX pipes should be insulated in certain situations. While insulation is not always necessary for pipes running through insulated interior or external walls, it is recommended for any pipes located in uninsulated rooms, unheated areas, or outside, especially in regions with cold winters. The primary reason is to prevent freezing. Although PEX is more resistant to cracking from freezing than other materials, repeated freezing and thawing can weaken the pipes over time, increasing the risk of a burst.

Yes, you can install insulation over ductwork, and doing so can save you money. Without insulation, the HVAC unit must work harder to force warm or cool air around the home, and once the air reaches the vent, it may not be the correct temperature. Insulating HVAC ducts makes your system work more efficiently, saving you money on heating and cooling bills.

Although spray foam insulation typically has a higher price point than traditional insulation, the benefits often justify the investment. It offers superior sealing properties, which can lead to significant energy bill savings. Spray foam also provides excellent moisture resistance and soundproofing. Other advantages include improved indoor air quality by minimizing allergens, a long lifespan of 80 to 100 years, added structural strength to the home, and a straightforward installation process.

The Janesville, WI homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.

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