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  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon74
    Verified insulation services reviews

Top-Rated Insulation pros in Philadelphia - Updated Nov 2026

Avatar for USA Insulation of Knoxville
USA Insulation of Knoxville
4.9(
38
)
Blown-In Insulation - Install or UpgradeBatt, Rolled or Reflective Insulation - Install or UpgradeInjection Insulation - Install

Serving Philadelphia, TN and surrounding areas

Approved

In business since 2021

Free estimates

Warranties offered

"The company rep came out as scheduled and conducted a thorough and professional estimate for the added insulation. Then the installers came out and again did an outstanding job adding insulation to our attic. They worked well as a team and did an excellent job."
Trucks
35 Years
35 Years
The Start
Blown In Insulation

+41

Response time1 day
Response rate92%
49 neighbors recently requested a quote
Avatar for Insulation Commandos
Insulation Commandos
5.0(
15
)
Blown-In Insulation - Install or UpgradeInjection Insulation - Install

Serving Philadelphia, TN and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"Insulation Commandos is an outstanding company! Excellent communication with Matthew (phone, text and emails), detailed quotes with line item breakdown, photos throughout the process and video, fast service and completion of work. Insulation Commando's went beyond my expectations in my home repairs, I highly recommend them. From the first inspection, material removal, installation of new insulation, air sealing of crawl space, to the attachment of the floor joists.. I knew I made the right decision. They made my house, my home again! I look forward to hiring them to complete additional projects."
Project Photos
Project Photos
Project Photos
Response time12 hrs
Response rate100%
47 neighbors recently requested a quote
Avatar for RetroFoam of East Tennessee
RetroFoam of East Tennessee
5.0(
11
)
Blown-In Insulation - Install or UpgradeSpray Foam Insulation - InstallInjection Insulation - Install

Serving Philadelphia, TN and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"Eddie fully explained the benefit of the planned level of insulation for our attic, uses quality Owen's Corning fiberglass blown in insulation and recommended adding an roof vent attic fan to remove heat/moisture in the summer and moisture in the winter. Currently, we have passive eve vents and roof ridge vent. Cooling inside of the roof with air flow should help extend the life of the shingles by removing stagnant hot air. We chose an electric roof vent fan rather than solar because of the # of cloudy days in our area and humidity. Everything was done quickly on scheduled time, all contacts were professional, kept our home as clean as possible and swept up loose insulation. Pricing was very competitive plus we qualified for TVA energy rebate."
Open cell spray foam
Open cell sprayfoam on attic wall
Open Cell spray foam on flat roof deck
Open cell spray foam on roof deck
Open cell on roof deck

+9

Response time8 hrs
Response rate95%
25 neighbors recently requested a quote
Avatar for On The Spot
On The Spot
5.0(
14
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or Upgrade

Serving Philadelphia, TN and surrounding areas

In business since 2021

Free estimates

Credit card accepted

"James and his crew did a phenomenal job with the insulation job! His communication was great. Very honest and upfront about what can and can’t be done. No trying to finesse an upsale or anything like that. I'm very glad we went with James and I'd highly recommend him to anyone looking."
Crawlspace
Crawlspace
Crawlspace
Crawlspace
Crawlspace

+3

Response time8 hrs
Response rate100%
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Insulation FAQs, answered by experts

If you have access to the foundation walls, adding spray foam insulation to your existing unfinished basement or crawl space is straightforward. Replacing existing insulation in your unfinished attic space is possible after removing the old insulation. However, spray foam insulating an existing wall after the drywall is in place isn’t possible unless you remove most of the drywall.

Yes, it is possible to have too much insulation, which can have detrimental effects. While more insulation might seem better for energy efficiency, a home needs to "breathe" or ventilate to release moisture that accumulates inside. Over-insulating can seal a house too tightly, trapping water vapor and leading to several problems, including mold, mildew, and condensation. Homes in warm, humid climates are particularly susceptible to mold, while those in colder climates can experience condensation from temperature fluctuations. Additionally, adding more insulation than the recommended amount for your climate may not provide recoverable energy savings. To avoid these issues, consult a professional insulation contractor who can determine the optimal amount of insulation for your home.

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.

Whether you should remove old insulation before blowing in new insulation depends on your particular situation. Fiberglass insulation attracts insects and mold over time, so if it has been decades since your last insulation upgrade, consider removing the old materials before placing the new ones. However, most types resist mold, insects, and mildew, so once you get the go-ahead from your contractor that your space is free from all three, feel free to install the new insulation directly on top of the pre-existing materials.

One of the disadvantages of soffit vents is they can bleed warm air from the attic during winter, resulting in slightly higher energy bills and a colder house. There are ways to mitigate this effect—mostly just closing the vent in the fall. What’s most important is your attic is ventilated to some degree in the winter.

The Philadelphia, TN homeowners’ guide to insulation services

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