4.3 
11 *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
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."
+13
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!"
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!
Serving Monticello, IL and surrounding areas
In business since 1993
Free estimates
"Very courteous and they clean up afterwards. They give you a lot of insulation for your money. Theyâ re hard workers."
Serving Monticello, IL and surrounding areas
In business since 2001
Free estimates
Warranties offered
"Kyle is a professional in all aspects, timely phone calls, getting back to me, and very polite. I reached out to Olmsted Brothers for an insulation quote and he got it back to me right away. I am not ready to proceed right away due to other reasons, but am looking forward to working with Olmsted Brothers in the near future."
+20
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."
Serving Monticello, IL and surrounding areas
In business since 2013
Free estimates
Offers commercial services
We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade, combined with ability, is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Call us today!
+3
Serving Monticello, IL and surrounding areas
In business since 1974
Free estimates
Offers commercial services
With over 30 years of experience in the Insulation industry, we are the experts you need to take care of your home or business. We handle everything from insulation to waterproofing. We will treat your home as we would treat our own. Give Insulation Service, a call today, we look forward to working with you!
Serving Monticello, IL and surrounding areas
In business since 2001
Free estimates
Credit card accepted
"It all went perfectly and was completely finished in 2 days. The next several days we had heavy rains and absolutely no leaks.
I would definitely recommend them."
+13
Serving Monticello, IL and surrounding areas
In business since 1971
Credit card accepted
"Roberto was the technician and he was very professional, polite, and personable. He inspected the rest of our system and told us things that needed to be changed or repaired. He showed me pictures of everything. Everything he told me about was accurate. He quoted me a price for R38 insulation , Some of our ducts were plastic and he recommended them to be changed. I agreed completely and didn't know they were plastic. I would have had them done the work but I had no price comparisons to make and besides I didn't have the money right then. So he just finished the vent cleaning and left his card. He did a great job on the vent cleaning and was happy with the work."
+2
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