Basement Insulation in Connecticut
Keep your basement warmer, drier, and pest-free — get a free insulation estimate in Connecticut with clear, upfront pricing.
The Benefits Insulating Your Basement
Why you should insulate your basement or crawl space
Lower Energy Bills All Year Long
Insulating your basement or crawl space helps stop heat loss in winter and keeps cool air in during summer. That means your HVAC system works less—and your utility bills shrink.
Say Goodbye to Drafty Floors
If your floors feel cold in the winter, chances are your crawl space or basement isn’t properly insulated. We seal and insulate the rim joists, ceilings and walls so you can walk barefoot comfortably, even in a Connecticut January.
Keep Moisture and Mold Out
Insulation paired with air sealing helps prevent damp, musty conditions that lead to mold growth. A dry basement protects your home’s structure and your family’s health.
Stop Pests at the Entry Point
Mice, insects, and critters love unfinished basements and crawl spaces. Insulating and sealing these areas closes off easy entry points and creates a cleaner, healthier home.
Boost Your Home’s Resale Value
Energy-efficient homes sell faster and for more. Professionally insulating your basement shows future buyers you’ve done it right from the ground up—literally.
More Usable Living or Storage Space
Insulated basements are drier, more comfortable, and better for storage (or finishing into living space down the line). It’s an easy way to get more from your square footage.
Improve Indoor Air Quality from the Ground Up
Insulating and sealing your basement or crawl space helps keep out dust, mold spores, and outdoor pollutants—so the air inside your home stays cleaner and healthier to breathe.
What We Insulate?
Every zone in your home loses heat differently. Nealon matches the right material to each area — walls, ceilings, and doors — for connecticut homeowners.
Rim Joists
Foundation Walls
Basement Ceilings
Insulation Showdown:
Cellulose vs. Fiberglass vs. Spray Foam
Not sure which insulation is right for your home? We broke it down across the stuff that actually matters
When to Insulate Your Basement?
Here are common scenarios when you should insulate your basement to avoid larger issues.
Finishing or Remodeling Your Basement
If you're turning your basement into livable space, proper insulation is essential for comfort, moisture control, and energy savings.
Dealing with Cold Floors Upstairs
Cold floors on the first level often mean your basement or crawl space is uninsulated—adding insulation can fix that fast.
Battling Moisture, Mold, or Musty Smells
Basement insulation helps block humid air and condensation, reducing the risk of mold growth and that classic musty basement odor.
Heating and Cooling Bills are Too High
Insulating below-grade spaces prevents energy loss and keeps your HVAC system from working overtime—especially in Connecticut’s extreme seasons.
You're Seeing Signs of Pests and Rodents
Sealing and insulating rim joists and walls creates a tighter barrier against rodents, insects, and critters looking for a way into your home.
What Does Insulation Cost in Connecticut?
Every job is different — here's what most homeowners pay, by scope.
$1,500 - $3,000
Fiberglass or rigid foam board at rim joists. Quick install that stops drafts along the foundation line.
$3,000 - $5,000
Mixed materials covering rim joists and wall cavities. Full-day install with the Nealon crew.
$5,000+
Closed-cell spray foam across walls and rim joists. Best moisture resistance and long-term performance.
Frequently Asked Questions?
Do I really need to insulate my basement in Connecticut?
Yes, basement insulation is essential in Connecticut due to cold winters and humid summers. It improves comfort, reduces energy costs, and helps control moisture throughout the year.
What’s the best type of insulation for basements or crawl spaces?
The best type of insulation for basements or crawl spaces depends on the structure. Closed-cell spray foam works best for sealing moisture-prone areas, while rigid foam or mineral wool is ideal for insulating foundation walls. The right choice depends on your goals and budget.
Will basement insulation help with cold floors upstairs?
Yes, basement insulation helps with cold floors upstairs by reducing heat loss through the ceiling or crawl space. Insulating these areas keeps first-floor rooms warmer during winter and improves overall comfort.
Can insulation prevent mold and moisture problems?
Yes, insulation can prevent mold and moisture problems when installed correctly. Combined with air sealing, it controls humidity, reduces condensation, and blocks the conditions that allow mold to grow.
Will insulating my basement keep out mice and pests?
Yes, insulating your basement helps keep out mice and pests. Sealing rim joists and insulating foundation walls blocks entry points and deters rodents and insects from entering your home.
Can I insulate my crawl space too?
Yes, you can and should insulate your crawl space. Insulation in both vented and unvented crawl spaces reduces heat loss, controls moisture, and improves indoor air quality throughout the year.
The Nealon Difference
Where Historic Charm Meets Modern Efficiency – Without Compromise
Older Home Specialists
As EPA Lead-Safe certified contractors, we understand the unique challenges of insulating historic New England homes.
Proven Energy Savings
Our customers typically see a 30% reduction in energy costs after our professional insulation services. Your investment often pays for itself through years of lower utility bills.
Professional Energy Assessment Process
Every project begins with a thorough energy assessment to identify your home's specific needs.
Reviews from our customers over 48 years
"I recently bought a house with asbestos in the attic, and decaying, improperly installed insulation in the basement. Nealon helped me re-insulate both the attic (post-remediation) and the basement, and I could not be happier with the result. They removed and disposed of all the old non-asbestos insulation (asbestos was professionally remediated prior to my contacting Nealon), and installed all new, high-quality insulation all around. Could not be happier with the experience! Good communication, high-quality work, and a reasonable price! Although I was on the wait-list for a while (I understand why they are in demand!), once they started the job they got an impressive amount of work done in a very short time."
"I had an excellent experience with this company from start to finish. Working with Jennifer in the office made the process smooth and stress-free—she was professional, responsive, and a pleasure to work with. The on-site team was equally impressive: friendly, knowledgeable, and highly professional. They explained everything clearly and did outstanding work. I couldn’t be happier with the results and would highly recommend this company to anyone looking for insulation services."
Nealon did an outstanding job in terms of courteous services, as their team members, as well as Chris who was responsible for directing the job, were most professional!!! They cleaned up nicely, and my goods remained intact. Also and happily stated, it’s been one week since they’ve installed insulation in our home, and we notice a huge difference in the amount of energy we are using for heating…which equates to $avings!!! In short, we’d use them again, and glad we chose them for this endeavor!!!
Highly recommended. Their estimate was competitive, the work was done in a timely and clean manner, they explained what was done, and our house is warmer as we head into the winter. When we had a question, they came back out to talk with us and helped us answer our questions. I will use them again and recommend them to anyone.
They are an amazing company to do work with! Jen in the office is polite, pleasant, and very competent. The work was done well and very quickly. We had our attic and basement insulated. I would 100% recommend!
The Nealon team was professional and considerate of my property. I noticed a 200-kilo watt decrease in my electric bill along with an additional savings in oil consumption of 50 gallons. No more drafty cellars and so far, the mice have gone elsewhere.
Fast, efficient and great price! Didn’t even notice them insulating our attic and making a big difference already! Would highly recommend for anyone that wants to cut down on their energy bill!!
Great experience! Very friendly and professional. They were on time, stuck to their quote and work timeline and have done a great job with two projects for me. I would definitely recommend.
Nealon Energy Solutions has been my go to company for my personal property energy solutions & savings and all of my residential remodeling projects. as a remodeling contractor myself, I take pride in utilizing quality trades people, using quality products that perform at the top of their game. Nealon has the depth of experience that is in my opinion unmatched in the CT business market. Clients appreciate the thorough explanations of the options available to them, the professional execution of the contracted work and the cleanliness of the project when the work is completed. GO NEALON!!
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