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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 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
Insulation Project
Insulation Project
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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

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

Closed-cell spray foam insulation itself serves as a vapor barrier (or vapor retarder). However, you may need to install a vapor barrier if you have open-cell spray foam insulation. When in doubt, work with a professional insulation contractor, as they can provide more detail about the specific needs of your home in your climate.

Cellulose insulation is usually made from recycled paper products, such as old newspapers, but cellulose might also contain recycled denim. While most homeowners traditionally buy cellulose insulation to use for installation, it is possible to make your own at home with old newspapers, cardboard, a paper shredder, and boric acid (important for fireproofing your cellulose insulation materials).

Carriage, sliding, folding, and trackless pivot doors all replace a standard roll-up door. Glass doors and roll-up screens work well when you convert the garage into living space. Match the style to your driveway clearance and climate.

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

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.