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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

The most obvious con of injection foam is the cost. It’s much more expensive to install than fiberglass or spray foam, but it may be your only option (unless you want to remove entire walls around the home). Another con is that it involves drilling into existing material, which has to be repaired after the foam is injected. Some injection foams are made from products that aren’t environmentally friendly, and improper installation can lead to trapped moisture, which can lead to expensive mold remediation down the road. 

Yes, even though frost-free and freeze-proof faucets are designed to withstand winter weather, it is still recommended to cover them with an insulated cap, especially during periods of extreme cold. These faucets work by keeping excess water inside the home's heated space and using a downward slope to drain, but this protection can be compromised. For the faucet to work correctly, you must always disconnect any attached hoses before temperatures drop below freezing, as a hose can trap water and lead to freezing. Ultimately, covering all outdoor faucets, even freeze-proof models, is the best way to prevent frozen and burst pipes.

The thickness of floor insulation will depend on the R-value you plan to achieve. R-value varies on the type of material as well as its thickness and density. Insulation materials with low R-values can be layered to match the value of denser materials. As long as your floor insulation is packed tightly, seals the area from drafts, and doesn’t prevent ventilation, it can be as thick (or thin) as you need.

The benefits of insulating your pipes include preventing freezing, sweating, and condensation. In addition, insulating your pipes can make your home more energy-efficient by keeping your pipes from losing or gaining heat. You’ll be able to turn the temperature of your water heater down by two to four degrees Fahrenheit. According to the U.S. Department of Energy, this can reduce energy costs by 3% to 4% per year.

Yes, you need a 1.5-inch to 2-inch air gap in a cathedral ceiling to allow proper air flow and prevent cathedral ceiling venting problems. This amount of airspace allows warm, moist air to properly leave your ceiling to avoid moisture build-up and other issues that put your home at risk. You can also add an air vent for extra air flow.

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.