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Best insulation pros near Knoxville, IA

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Top-Rated Insulation pros in Knoxville - Updated Nov 2026

Avatar for AFI Insulation
AFI Insulation
4.4(
60
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - Install

Serving Knoxville, IA and surrounding areas

Approved

In business since 2014

Free estimates

Small jobs welcome

"This could not have gone any smoother. Despite having to re-schedule the original, 1st quoting appointment, Darren was here the very next day. I had a quote by the end of that 2nd day/appointment, was scheduled the next day for the following Monday and the 2-person team was in and out within 90 minutes. My kids didn't even wake up(granted, they could sleep thru the emergency siren!) but wow. My attic/crawl space is now fully insulated! All this while we are adjusting to our new normal of social distancing and heightened sanitary measures. I would use AFI again and would recommend them based on this experience."
Response time2 days
32 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Retrofoam Iowa, Inc.
Retrofoam Iowa, Inc.
4.3(
44
)
Blown-In Insulation - Install or UpgradeInjection Insulation - InstallSpray Foam Insulation - Install

Serving Knoxville, IA and surrounding areas

In business since 2000

Free estimates

Warranties offered

"Jeff Smith is based at the Waterloo office. He was very good at customer service & responded to my emails in a reasonable time given this is probably a busy time of the year (November) for them. I am having additional blow in insulation behind a knee wall & in the attic to bring me up to code. The work has not been completed yet. I am waiting for an energy audit. That is why I can only rate the company as a 3."
 Remove siding, inject product, replace siding.
 We fill the entire space...
 Between the studs-sealing the home
Homes we have insulated
Homes we have insulated

+6

Recommended by100%of homeowners
Avatar for L & L Home Solutions With Universal Windows Direct
L & L Home Solutions With Universal Windows Direct
4.9(
88
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Knoxville, IA and surrounding areas

In business since 2008

Free estimates

Credit card accepted

"The team was on time and very friendly. They explained what they were going to do and got right to work. They laid out materials to cover our belongings in the bedroom as well as the carpet. After they had installed the insulation they patched the holes really well. I won't have to do any extra work! They even vacuumed after they were done which was really appreciated and a sign they care about the quality of the work they complete. I will hire them again in the future to complete more insulation of our attached garage. I would also recommend them to friends and family!"
Insulation Project
Insulation Project
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Insulation Project
Insulation Project

+2

Recommended by100%of homeowners
Avatar for I-Town Insulation
I-Town Insulation
5.0(
2
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Knoxville, IA and surrounding areas

In business since 2021

Free estimates

Credit card accepted

Thank you for finding I-Town Insulation here on Angi! We are family owned and operated in the Des Moines area and are actively booking Insulation Replacement projects and exterior work for your home! We are fully insured and I personally back up all of our completed work to assure everything is done right the first time! I look forward to speaking with you directly on our next project.

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Recommended by100%of homeowners
Avatar for Daughenbaugh Construction & Restoration
Daughenbaugh Construction & Restoration
4.5(
37
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Knoxville, IA and surrounding areas

In business since 2002

Free estimates

"Had a water leaking through my roof from Ice dams and damage on whole wall on the west side of my living room.  They had to replace all dry wall, insulation and match the half of my ceiling to the other half that was not damaged.  Also replace a huge 1960 window with 3 new energy  windows.   Great work you would never know that the half of the room had been redone match all the paint and knock down on the ceiling to a tee.  Very knowledgeable, professional and kept me updated on all the process that was going on."
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+2

Recommended by90%of homeowners
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Insulation FAQs, answered by experts

If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install blown-in insulation. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than $100. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.

Using plastic shrink film over the window will cut down on drafts, which makes the air inside your home feel warmer. Plastic shrink film doesn’t quite have the insulative properties of a new window or of adding insulation inside the window jamb, but it will help. Plus, it’s a cost-effective solution to keeping your home warmer.

Fiberglass is considered dangerous only if your skin comes into contact with it or if you breathe in any fiberglass particles. This is because fiberglass is literally made of tiny fibers of glass that can cut your skin and your organs. While there aren’t many long-term effects, it’s still important to take all the proper safety precautions when working with fiberglass.

In nearly all cases, you are required to install a vapor barrier in your crawl space. However, local regulations will change based on the local climate and the crawl space's susceptibility to moisture. Even if a vapor barrier is not legally required, it is often a good idea to keep your crawl space dry.

Insulating ducts prevent or significantly reduce condensation by reducing temperature differences between the duct surface and surrounding air. Proper insulation also minimizes sweating, improves energy efficiency, and prevents moisture damage. However, if humidity levels are unusually high or there are air leaks, additional measures like sealing ducts and using a dehumidifier may be needed.

The Knoxville, IA homeowners’ guide to insulation services

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