Insulation contractors in Connecticut
Find insulation contractors across Connecticut. Use the city pages below to compare local pros, or scroll down to see the top-rated contractors statewide.
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Bridgeport, CT
Hartford, CT
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Stamford, CT
Top-rated insulation contractors in Connecticut
These are the highest-rated insulation contractors across all cities we track in Connecticut.
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New England Performance Insulation
262 Quarry Rd, Milford, CT 06460
Milford, CT insulation contractor offering spray foam, fiberglass, and cellulose options, attic insulation, energy assessments, and ice dam prevention, with strong homeowner reviews.
Services offered
Reviewer highlights
Trust signals
From reviews & website
“The sales appointment was informative with different options on what was available and would work best for my situation.”
review: Shows the provider communicates options and clearly explains choices.
Workmanship
Excellent
Communication
Excellent
Scheduling
Excellent
Cleanup
Excellent
Home Comfort Practice, Inc.
165 Benton St, Stratford, CT 06615
Energy-efficiency upgrades including insulation, air sealing, windows, and energy assessments with a reputation for honesty, clear communication, and tidy workmanship.
Services offered
Reviewer highlights
Trust signals
From reviews & website
“Energy Assessments”
website: Shows the provider offers energy efficiency evaluations as a core service.
Workmanship
Excellent
Communication
Excellent
Scheduling
Ask during quoting
Cleanup
Excellent
Energy Nerds LLC
Chapman St, New Britain, CT 06051
Energy Nerds LLC offers attic insulation and basement insulation (sprayed) in the Hartford, CT area, with highly positive reviews for professionalism, honesty, clear communication, and demonstrated energy-efficiency outcomes.
Services offered
Reviewer highlights
Trust signals
From reviews & website
“We had attic insulation work done and I was very impressed with how professional and honest this company was from start to finish.”
review: Supports trustworthiness and overall professionalism.
Workmanship
Excellent
Communication
Excellent
Scheduling
Ask during quoting
Cleanup
Excellent
Advanced Insulation Milford
100 Lansdale Ave, Milford, CT 06460
Milford-area insulation contractor offering spray foam and traditional insulation with free estimates and guaranteed work; praised for professionalism, responsiveness, and clean-up.
Services offered
Reviewer highlights
Trust signals
From reviews & website
“Residential Spray Foam”
website: Shows they offer spray foam insulation services, a key capability for homeowners evaluating options.
Workmanship
Excellent
Communication
Excellent
Scheduling
Excellent
Cleanup
Excellent
3K Pro
44 Endeavor St, Trumbull, CT 06611
Residential and commercial insulation contractor offering spray foam, fiberglass, Roxul, blow-in cellulose, soundproofing, and old insulation removal, with a focus on energy savings and strong homeowner communication.
Services offered
Reviewer highlights
Trust signals
From reviews & website
“Residential and Commercial FREE ESTIMATE”
website: Shows the company offers estimates for homeowner projects.
Workmanship
Excellent
Communication
Excellent
Scheduling
Excellent
Cleanup
Excellent
Koala Insulation of Central Connecticut
148 Dividend Rd Unit A, Rocky Hill, CT 06067
Hartford-area provider with 5-star reviews; website access currently blocked; reviews highlight proactive communication and courteous, punctual service.
Reviewer highlights
Trust signals
From reviews & website
“Very pleasant workers and they are very proficient as we as very prompt with showing up! They also communicated with us prior to the project and we had a very pleasant experience!”
review: Shows punctual arrival and clear communication before the project.
Workmanship
Ask for references
Communication
Excellent
Scheduling
Excellent
Cleanup
Ask during quoting
What to verify in Connecticut
Plan before you hire
These pages help you build a shortlist, but they don't replace a proper scope discussion with each contractor. If you're still deciding what work your home needs, start with the insulation planning guide and ROI calculator.