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  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon61
    Verified insulation services reviews

Top-Rated Insulation pros in Thornburg - Updated Nov 2026

Avatar for Managed Services Group, LLC
Managed Services Group, LLC
4.8(
43
)
Blown-In Insulation - Install or UpgradeBatt, Rolled or Reflective Insulation - Install or UpgradeSpray Foam Insulation - Install+1 more

Serving Thornburg, VA and surrounding areas

Approved

In business since 2008

Free estimates

Warranties offered

"We had astronomical winter heating bills in the first winter in our new (old) home. I hired Shane and his team to install a vapor barrier in my crawlspace, insulation in my basement and to replace my crawlspace doors which were deteriorated and lacked insulation. The quote process was thorough but quick. They scheduled the work quickly as well. On install, they literally unearthed a mountain of construction debris that had collected under the house for who knows how long. They completed the job in just a couple of days and the results were more than impressive. We also chose to replace our windows and the result of both jobs brought our energy bill down by more than 50%. All-in-all we were thrilled with the outcome of the work with Managed Services Group and would highly recommend them to others. Priced fairly and flexible on scope. These guys just get it."
Hanging the Dehumidifier
Hanging the Dehumidifier
Clean
Attic Entrance
Crawlspace Access

+62

Response time2 days
14 neighbors recently requested a quote
Recommended by82%of homeowners
Quality Eco Technologies
4.5(
23
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install

Serving Thornburg, VA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

"The installers were professional and courteous, they cleaned up after themselves and left my home in the same condition as when they arrived. The blown-in insulation has made a noticeable improvement over the temperature on our 2nd floor."
Recommended by94%of homeowners
Marks Duct Cleaning & Insulation Inc
5.0(
10
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Thornburg, VA and surrounding areas

In business since 2004

"Rehabbing home and needed air ducts cleaned and insulated and under floor insulated. Mark and his team were available the same day and offered the lowers price around. Mark showed up promptly, was polite and courteous. Mark provided advise and shared his experience on all aspects of the work being performed and not only was comfortable with me watching but egar to explain. Expedited service, at site on time, went right to work."
Recommended by100%of homeowners
Avatar for Evergreen Electric LLC
Evergreen Electric LLC
4.9(
36
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Thornburg, VA and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"I called Evergreen Electric and setup an appointment for the next day to perform what I figured would be a couple small jobs and to receive an estimate to run cable into new rooms. The original appointment was delayed because of a power outage on another job, but speaking to Josh on the phone, he was willing to come by as soon as he was finished even though it would have been well into the evening. I told him the following day would work fine and we rescheduled the appointment.
Josh arrived the next day and examined our situation. Our house is nearly 40 years old and it turns out the problems were much deeper than I thought. Josh crawled into the attic and rewired the junction boxes that were not just loose but had previously been wired incorrectly. He also spent well over an hour attempting to diagnose why our breaker was tripping without much of a load on it. He was very thorough in his troubleshooting. He replaced the breaker with a higher amp version and the problem is fixed, but he also indicated there is likely more faulty wiring running through the attic buried under the insulation and someone should come back to assess the entire electrical system.
Josh was very courteous and professional and answered all of my questions. After spending about 2.5 hours with us, I was expecting a large bill. I was very pleased when he told me he would only be billing me for one hour.
About 30 minutes after he left, we noticed that a light in the hallway would not turn off. I called to report it and Evergreen responded immediately. Josh came back right away and fixed the problem. He even replaced the light switch free of charge. It is nice to see a company that stands by its work and acts so quickly when something is wrong.
I would highly recommend Evergreen Electric. They are prompt, thorough, and stand by their work.


"
Recommended by100%of homeowners
Avatar for ARS / Rescue Rooter Manassas
ARS / Rescue Rooter Manassas
4.4(
719
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Thornburg, VA and surrounding areas

In business since 1947

Emergency services offered

Credit card accepted

"I think they did it all in one day. When we decided to go with them. We have one room that doesn't have a second story with recess lights. That room is fairly new, we put it in 6 years ago. He showed me pictures of stucco in there. All those lights were coming in through those recess lights, they were not properly caulked or insulated, so we were losing a lot of beautiful energy through those recess lights. He corrected that. He correct where some of the baffles were covered. He brought it up to high lighting. There was a giant antenna laying across the top of the attic in the main house doing absolutely nothing. They broke it up and removed it. I felt like they were my eyes and ears going up there, something I couldn't do and showed me things that were done incorrectly.  The original insulation was a bluff. It had been displaced. I actually had ceiling drywall in between the structure. They corrected it all. Even the ceiling access was properly insulated and closed. They are just very thorough. They helped us when they troubleshooted from the old company. The price seemed perfectly fair, they didn't try to sell you a cheap product with a cheap price. It seemed like a fair price in line with quality. That's all we really want."
Recommended by87%of homeowners
Avatar for Eco Windows and Siding
Eco Windows and Siding
4.5(
15
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving Thornburg, VA and surrounding areas

In business since 2010

Free estimates

Credit card accepted

"They arrived, spread plastic over the floors, stairs, and hallway.  They went into the attic and began repairs and caulking.  Once completed they spread the existing insulation, then added cellulose to proper level.  The installed the attic blanket and cleaned the area.  Great job, explaining what they were doing and asking if I had any questions or concerns.  Superior work."
Additional Photos
Recommended by100%of homeowners
Showing 1-10 of 25
Insulation FAQs, answered by experts

Insulating windows with plastic works, but it can be time-consuming, and the end results can—and often do—end up lacking in aesthetics. Window film and caulking your windows to make sure there are no drafts are two options that increase the energy efficiency of your home in a low-cost way. Plastic can be a good strategy while you consider alternatives.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

Rigid foam board insulation is one of the safest insulation materials for basement walls. The panels offer a moisture barrier to prevent mold and mildew build-up. At the same time, this material is also fire-resistant, so you don’t have to worry as much about a fire breaking out as you would with spray foam insulation. 

For your safety, you should always wear a mask when cutting batts of fiberglass insulation. We also recommend wearing eye protection, safety gloves, and long sleeves to protect your skin. Properly suiting up helps you avoid several fiberglass issues, such as cuts from the tiny shards of glass and inhaling small bits of fiberglass.

Mold can grow on garage ceiling insulation, which is why it’s important to install a vapor barrier behind the insulation and keep the space cooled and heated as you would your living area. Doing so will more or less eliminate the risk of mold growing on your garage ceiling insulation. You can also install a self-draining dehumidifier to help remove moisture, or opt for a foam board insulation or spray foam insulation that won’t harbor moisture and mold.

The Thornburg, VA homeowners’ guide to insulation services

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