Insulate Your Crawl Space,
Evict the Critters
Crawl space insulation keeps floors warmer, air cleaner, and energy bills lower—especially in older Connecticut homes
The Crawl Space: Small Area, Massive Impact
The Benefits Insulating Your Crawl Space
Warmer Floors in Winter
No more stepping onto ice-cold floors in the morning. Insulating your crawl space creates a thermal barrier that keeps heat where it belongs—inside your home, not leaking into the ground.
Lower Energy Bills
Heating an uninsulated crawl space is like dumping money into a cold, damp hole. Sealing it up can cut your energy bills by 10–20% or more, especially in older CT homes.
Fewer Drafts and Cold Spots
Drafts creeping in through floorboards? That’s your crawl space talking. Proper insulation reduces air leaks and helps maintain steady temps across the house.
Moisture and Mold Control
Connecticut’s humid summers and wet winters mean crawl spaces love to trap moisture. Insulation (paired with proper air sealing) helps prevent mold, rot, and all the funky smells that come with it.
Keeps Rodents and Bugs Out
An insulated, sealed crawl space is a lot less welcoming to mice, spiders, and whatever else tries to sneak in. Bonus: no more scratching sounds under the floor at 2am.
Better Indoor Air Quality
Up to 40% of the air you breathe on the first floor comes from the crawl space. Sealing and insulating it keeps out allergens, pollutants, and damp air that can mess with your lungs and your HVAC system.
Boosts Home Comfort Year-Round
Whether it’s 10°F or 90°F outside, insulation under the house helps keep you comfortable. Think of it as putting a pair of warm boots on your house—it just handles the weather better.
When to Insulate Your Crawl Space?
Here are common scenarios when the time is right to insulate your crawl space.
Your Floors Feel Like Ice in the Winter
If your socks aren’t cutting it and your hardwood floors feel like an ice rink from November to March, chances are your crawl space is uninsulated. Warm air rises—but without a thermal barrier underneath, your heating system is fighting a losing battle.
You’ve Seen (or Heard) Rodents Below
Scratching under the floor, droppings near vents, or worse—sightings of little uninvited guests? Crawl spaces are prime real estate for mice and bugs. Insulating and air sealing it makes your home way less appealing to critters.
You’re Dealing with Musty Smells or Moldy Corners
Notice that damp, earthy smell wafting up from the floorboards? That’s a telltale sign of moisture collecting in the crawl space—especially common in shoreline homes and low-lying areas. Insulation + vapor barrier = dry, clean air upstairs.
Your Energy Bills Are Creeping Up
If your heating and cooling bills are climbing but nothing else has changed, your crawl space could be a major energy leak. Insulation seals the underside of your home so your HVAC system isn’t working overtime to keep up.
You’re Renovating or Replacing Flooring
New hardwoods? Upgraded vinyl plank? Before you install that fancy floor, insulate the crawl space first. It protects your investment, improves comfort, and prevents moisture from warping or damaging your new surfaces.
Your Path to Superior Insulation Starts Here
Efficiency Meets Excellence, Every Step of the Way
Building science is complicated. Our estimators don't just tell you what we'll do, they explain why we're doing it.
We work with your timeline and availability. We typically schedule 2 - 4 weeks out
You will have a dedicated project lead and project manager who will walk you through every step of the process
Your home becomes your comfort zone, as you stop dealing with drafty rooms, inconsistent temperatures, and high energy bills.
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.
Frequently Asked Questions?
What’s the difference between vented and unvented crawl spaces—and which should I have?
The main difference between vented and unvented crawl spaces is airflow. Vented crawl spaces allow outdoor air in, which can cause moisture and cold floors. In Connecticut, unvented (sealed) crawl spaces are better for keeping the space dry, warm, and energy efficient.
Should I remove old insulation before adding new crawl space insulation?
Yes, you should remove old crawl space insulation before adding new. Damp, moldy, or compressed material can trap moisture and attract pests. Nealon Insulation removes damaged insulation and installs new material with proper sealing for long-lasting performance.
What kind of insulation is best for crawl spaces?
The best insulation for crawl spaces is rigid foam board for walls and closed-cell spray foam for tight areas. Foam board resists moisture, while spray foam also acts as a vapor barrier. Fiberglass batts are not ideal—they absorb water and tend to sag.
How much does crawl space insulation cost in Connecticut?
Crawl space insulation in Connecticut typically costs between $2,000 and $6,000, depending on size, condition, and materials. Extra services like cleaning or mold remediation increase the price. Most projects pay for themselves through energy savings within a few years.
How long does it take to insulate a crawl space?
Insulating a crawl space usually takes 1–2 days. If the job includes air sealing, vapor barrier installation, or rodent cleanup, it may take longer. Nealon Insulation provides a clear timeline before starting any work.
Will insulating the crawl space make my home more humid?
No, insulating the crawl space won’t increase humidity. It actually lowers it by blocking ground moisture and outside air. For homes with existing humidity problems, adding a dehumidifier may be recommended for best results.
Do I still need a vapor barrier if I insulate?
Yes, you still need a vapor barrier even if you insulate. Insulation controls temperature, while a vapor barrier blocks ground moisture. Using both keeps your crawl space dry and protects your home from mold and humidity issues.
Is crawl space insulation something I can DIY?
You can DIY crawl space insulation, but it’s challenging and easy to get wrong. Mistakes like skipping air sealing or using the wrong materials can lead to wasted time and money. Professional installation ensures lasting performance and moisture control.
Reviews from our customers over 48 years
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.
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