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  • Average homeowner rating star icon4
    Average homeowner rating
  • Verified reviews icon14
    Verified insulation services reviews

Verified Reviews for Insulation Service pros in Monticello, IL

*The Angi rating for Insulation Service companies in Monticello, IL 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 Monticello, IL 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 March 15, 2026

Top-Rated Insulation pros in Monticello - Updated Nov 2026

Avatar for Horn Insultation
Horn Insultation
4.7(
72
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - InstallBatt, Rolled or Reflective Insulation - Install or Upgrade+1 more

Serving Monticello, IL and surrounding areas

Approved

In business since 1992

Free estimates

Credit card accepted

"Horn Insulation did a tremendous job insulating our house. The quality of their work was great and they were a pleasure to work with. I highly recommend them!"
27 neighbors recently requested a quote
Recommended by91%of homeowners
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Avatar for Slagel Insulation, Inc.
Slagel Insulation, Inc.
4.9(
8
)
Spray Foam Insulation - InstallInjection Insulation - Install

Serving Monticello, IL and surrounding areas

Approved

In business since 1975

Free estimates

Offers commercial services

"This company did a great job of insulating my pole barn. I would highly recommend them."
Pole barn
Pole barn
Pole barn
Pole barn
Before

+13

Response time1 day
4 neighbors recently requested a quote
Recommended by100%of homeowners
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Assured Insulation Decatur, LLC
5.0(
1
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+1 more

Serving Monticello, IL and surrounding areas

Approved

In business since 2014

Free estimates

Customers say: Quick response

We are a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 10 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

Response time1 day
Response rate92%
Recommended by100%of homeowners
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Avatar for Horn Spray Foam & Insulation
Horn Spray Foam & Insulation
4.7(
70
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+1 more

Serving Monticello, IL and surrounding areas

In business since 1993

Free estimates

"Prompt, courteous service. Price was very reasonable also. Would highly recommend Horn Insulation for any of your insulation needs!"
Response time4 days
Recommended by93%of homeowners
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Avatar for Olmsted Brothers Insulation, Inc.
Olmsted Brothers Insulation, Inc.
5.0(
11
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+1 more

Serving Monticello, IL and surrounding areas

In business since 2001

Free estimates

Warranties offered

"The Olmstead Brothers did exactly what they said and did it in a timely manner. They did not "mess" up the house."
Closed Cell foam
Closed Cell foam
Closed cell foam
Closed cell foam
foam and cellulose.

+20

Response time1 day
Recommended by100%of homeowners
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Avatar for Honegger Insulation
Honegger Insulation
4.5(
42
)
Blown-In Insulation - Install or UpgradeInjection Insulation - Install

Serving Monticello, IL and surrounding areas

In business since 1978

"This service went above what was expected. They fixed issues that came up and needed attention without altering the original bid. I will recommend them to anyone needing insulation."
Recommended by57%of homeowners
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Avatar for Insulation Service
Insulation Service
5.0(
2
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+1 more

Serving Monticello, IL and surrounding areas

In business since 1974

Free estimates

Offers commercial services

"Very good work, Gained 6-8 Degrees in home - COMPLETELY ELIMINATED drafts, Very hard worker (Clark) DID very good job."
Response time4 days
Recommended by100%of homeowners
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PSR Home Improvement
4.9(
14
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Monticello, IL and surrounding areas

In business since 2001

Free estimates

Credit card accepted

"They started at 8 am and worked till sundown. Had everything done in 2 days. Had a small leak say after with first rain. Called them to let them know. They had someone come within 30 minutes and fixed issue. Hasn't leaked since."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+13

Recommended by100%of homeowners
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Showing 1-10 of 18
Insulation FAQs, answered by experts

STC (Sound Transmission Class) is a rating that describes how well a building material or assembly blocks airborne sound. A higher STC rating means less noise will pass through the material, providing better sound reduction. This rating system applies to various building components, including windows, doors, flooring, drywall, and insulation.

For context, a typical single-pane window has an STC rating of around 25 (where normal conversations are audible), while a well-sealed, double-pane window can exceed STC 45 (blocking loud speech and most music). It is important to note that for some products, like soundproofing drywall, the STC rating refers to the entire wall system, not just the individual panel.

Additionally, STC ratings are most effective for measuring sound reduction at mid-to-high frequencies, such as human speech, and may not accurately reflect how well a material blocks low-frequency sounds like bass music or thunder. Because of these factors, it is recommended to consult a professional to determine the right STC-rated materials for your specific soundproofing needs.

Not necessarily. A higher R-value simply means that the insulation has a higher heat resistance and performs better in terms of how much heat passes through the material. This can be better for some homes, or it can be too high of an R-value for other homes. Again, your climate zone determines whether the insulation is better for your home.

One of the clearest signs that your insulation isn’t working as well as it should be is a noticeable difference in temperature throughout your home. One room might feel icy while another is hot as Arizona—this indicates that some parts of your home are either retaining or losing heat more than others. Additionally, a sudden increase in your energy bills, evidence of pests or rodents, or evident water damage are other signals that warrant a thorough inspection of your insulation and potential replacement.

Yes, exposure to fiberglass insulation can cause harm to your skin and eyes. However, this typically refers to the fiberglass insulation that is mostly used in walls and attics. Fiberglass doors don’t pose risks for fiberglass exposure because they're fully encased in polymer cladding.

Because of the moisture concern, open-cell foam requires a vapor barrier. The barrier protects against high humidity and moisture exposure in rooms such as basements, bathrooms, or exterior walls. It wouldn't be necessary in dry interior spaces.

The Monticello, IL homeowners’ guide to insulation services

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