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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
41 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Attic Solutions
Attic Solutions
4.8(
91
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or Upgrade

Serving Knoxville, IA and surrounding areas

In business since 2009

Free estimates

Warranties offered

"Prevailing came in to insulate my basement and attic. The workers were professional and worked the entire time they were here (which seems like a low standard, but I've had situations where 4 people come to work and 2 stand around talking for most of it from other companies). More importantly, they explained what they were doing as they did it, and cleaned up after themselves before they left! Scheduling the service was quick and easy since they were able to use our Alliant Energy quote to avoid a second home assessment, and they came in under budget. Very satisfied - plan to have them back to blow insulation in the exterior walls before winter."
Consistent insulation level.
Our family business
Newer attic insulation topped off to R-49
Insulation added in a restricted space to R-49
Attic insulation added around dense truss work.

+13

Response time8 hrs
Recommended by98%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

"Abraham and his team came out and completed our insulation project in -17° weather. My wife and I are thrilled with the finished product and the job that these guys did. We would definitely recommend them and would hire them again in the future. We have bedrooms above our garage that were 15° colder than the rest of our house so we had Abraham give us his expert opinion on what needed to be done to warm up those bedrooms and our garage. Only after about an hour after his team left, we could already feel the temperatures rising in both the bedrooms, and the garage. Can’t thank them enough for their hard work!"
Insulation Project
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+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 American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,689
)
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 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."
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+2

Recommended by65%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

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: 

  • If the insulation is over 15 years old

  • If the insulation is wet or moldy

  • If it is vermiculite insulation

  • If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

You can purchase bags of cellulose and loose-fill fiberglass blown-in insulation from the same local home improvement store where you rent your blower. If you want to use rock wool insulation, you may need to special order it.

The average cost to install insulation is around $1,800, but you could pay anywhere between $500 and $4,500, depending on various factors. Some of the things that have a significant influence on your pricing include the following:

  • Size of the area 

  • Type and R-value of the insulation 

  • Whether your space is finished or unfinished

  • Accessibility of the area

  • Your geographical location

  • Amount of site preparation, especially for blown-in insulation

  • Whether or not you need old insulation removed

Open-cell foam insulation has a life span ranging between 15 to 25 years when well cared for. However, the material may degrade sooner in areas with high humidity or after prolonged water exposure. Proper installation and maintenance can maximize its longevity but requires close monitoring. Closed-cell foam insulation has a longer life span of 30 to 50 years.

Vapor barriers in attics are a bit outdated and most areas no longer recommend them for attic spaces. For vented attics, the best method is usually to install drywall and cover it with latex paint before attaching insulation fiberglass, cellulose, or foam insulation. When renovating an attic to use as a living space, a contractor can guide you on the best way to cover insulation.

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.