Home Insulation - Greater Portland, Maine

Home Insulation in Maine
Dense-Pack Cellulose, Done Right

Q: How much does blown in insulation cost in Maine?

For a typical Maine home, attic insulation to R-50 costs $3,500 to $8,000 before rebates. Dense-pack wall insulation adds $5,000 to $10,000. Basement and rim joist insulation runs $1,500 to $4,000. Efficiency Maine rebates cover 40-80% of costs depending on household income, up to $8,000 total.

We always air seal before we insulate. It's the right way to do it. Then we fill every cavity (attic, walls, basement, and rim joists) using blown-in techniques that leave no gaps, no cold spots, and no excuses. Proper insulation is one of the most effective ways to reduce heating bills in Maine.

Air sealing first, then insulation, for maximum performance
Dense-pack and loose-fill cellulose: attic, wall, basement
Blower door testing to verify performance
Insulation rebates up to $8,000 - we handle all the paperwork

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Up to $8,000

in Efficiency Maine rebates available for insulation

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By the Numbers

The Case for Better Insulation

40%

Of Home Heat Lost Through Attic

$8,000

Max Efficiency Maine Rebate

2,500+

Maine Homes Insulated

R-50

Target Attic R-Value for Maine Retrofits

20-30%

Typical Heating Bill Reduction

1-2 days

Typical Installation Time

Insulation Types We Install

Most Common

Blown In Insulation (Cellulose)

Blown in cellulose insulation is our primary material for Maine homes. Unlike fiberglass batts that leave gaps around wiring, pipes, and framing, blown in insulation fills every cavity completely. Cellulose is made from 85% recycled newspaper, treated for Class 1 fire resistance and pest deterrence, and delivers superior thermal performance in cold climates. It settles into irregular joist bays and around obstructions, eliminating the cold spots that batts leave behind. With a 30+ year lifespan and zero off-gassing, it is the right choice for Maine attics and existing walls. Learn more: The Physics of Heat Loss in Maine Homes.

Foundations

Rigid Foam Board

Rigid foam board provides excellent thermal resistance and moisture protection for basement walls and foundations. It creates a continuous insulation layer that won't absorb water, making it ideal for below-grade applications. Learn more: Moisture Management in Maine Homes: A Building Science Guide.

Air Sealing + Insulation

Spray Foam (Rim Joists)

Two-component spray foam is the gold standard for rim joist insulation and air sealing. It provides both insulation and a complete air barrier in one application, eliminating a major source of cold air infiltration in Maine homes.

Dense-Pack

Wall Insulation

We use dense-pack cellulose to insulate existing walls without removing drywall. Small holes are drilled, material is blown in under pressure to fill every cavity, and holes are patched. Minimal disruption, maximum performance. Learn more: Wall Insulation Options for Maine Homes.

Blown-in cellulose insulation installed to R-50 in a Maine attic

Rigid foam board insulation installed on basement walls in a Maine home

SIGA Majpell air barrier installed on kneewall framing in a Maine home

The Process

How We Insulate Your Home

We always air seal before we insulate. It's the right way to do it.

Free Home Assessment

We walk through your home, identify where you are losing heat, and evaluate your current insulation levels. No equipment, no obligation.

Air Seal First

Before any insulation goes in, we seal all air bypasses (around wiring, plumbing, recessed lights, and top plates). This is critical for maximum performance.

Install & Verify

We install insulation to the specified R-value, then perform a post-installation blower door test to verify the improvement. We handle all Efficiency Maine paperwork. Learn more: How to Choose an Insulation Contractor in Maine.

Customer Reviews

What Our Insulation Customers Say

"The crew was meticulous. They sealed every penetration before blowing in the insulation, explained exactly what they were doing, and left the attic cleaner than they found it. Our heating bill dropped noticeably the very first month."

Jennifer H., Cape ElizabethVerified Google Review

"Horizon Homes is excellent! They have supported us for a number of projects across insulation and carpentry and I can't recommend them enough. Cody is extremely thoughtful and has supported us over hours on the phone answering questions."

Andrew M., PortlandVerified Google Review

"No more cold floors, no more drafts in the living room. The difference after insulation and air sealing was immediate and dramatic. I wish I had done this years ago. Horizon handled the Efficiency Maine rebate, and I didn't have to do a thing."

Diane L., FalmouthVerified Google Review

Pricing

What Home Insulation Costs in Maine

Project cost depends on your home's size, current insulation levels, and which areas need attention. Typical ranges before Efficiency Maine rebates:

Attic insulation to R-50: $3,500–$8,000
Dense-pack wall insulation (full house): $5,000–$10,000
Basement and rim joist insulation: $1,500–$4,000
Whole-home package (attic + walls + basement + air sealing): $10,000–$25,000. Learn more: What Is a Deep Energy Retrofit? A Guide for Maine Homes.

After Efficiency Maine rebates, most homeowners pay significantly less. Rebates cover 40% of project cost for any income level, 60% for moderate income, and 80% for low-income households, up to $8,000 total. We deduct rebates directly from your invoice. See the Efficiency Maine rebates guide for current amounts and income tiers.

Financing is available through Efficiency Maine's Green Bank starting at 0% APR, or through NEIF Energy Plus for flexible terms. We walk through your options at your free assessment. Learn more: Home Insulation Cost in Maine: A Homeowner’s Guide.

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Town-Specific Pages

Insulation by Town

Detailed local pages covering Portland's specific housing types and insulation challenges:

Insulation in Portland

Home Insulation Service Area

Horizon Homes installs home insulation across Greater Portland and Southern Maine, including:

Portland South Portland Westbrook Scarborough Gorham Falmouth Cape Elizabeth Windham Yarmouth Freeport Brunswick Topsham Kennebunk Saco Biddeford Kennebunkport Cumberland North Yarmouth Buxton Gray Standish

Common Questions

Home Insulation FAQs

What is the best blown in insulation for Maine homes?

Cellulose is the best blown in insulation for Maine's climate. Its higher density compared to fiberglass means better thermal performance and greater resistance to air movement through the insulation layer. Cellulose fills completely around wiring, pipes, and framing members, eliminating the gaps that fiberglass batts leave behind. It is also treated for fire and pest resistance, and its vapor permeability allows walls to dry properly in Maine's seasonal humidity swings.

How much does blown in insulation cost in Maine?

For a typical Maine home, attic blown in insulation to R-50 costs $4,000 to $8,000 before rebates, depending on attic size and access. Dense-pack wall insulation adds $5,000 to $10,000 for a full house. Efficiency Maine rebates cover 40-80% of insulation and air sealing costs depending on household income, bringing the out-of-pocket cost down significantly. We provide a detailed cost breakdown during your free energy assessment. Insulating first often means a smaller, less expensive heat pump system when you upgrade your heating next.

What areas of the home should I insulate first?

Start with the attic. Up to 40% of a Maine home's heat loss happens through an under-insulated attic. Air sealing the attic floor penetrations first, then blowing cellulose to R-50+, delivers the highest return of any single improvement. Rim joists and basement walls are next. Air sealing is always done before insulation for maximum results and full rebate eligibility. We sequence your project at the free assessment based on your budget and goals. If you are seeing moisture or condensation in your walls or attic, read our guide on dew point and wall condensation in Maine homes before deciding where to start.

How long does blown-in insulation last?

Properly installed blown-in cellulose lasts 30+ years without maintenance. It does not compact significantly when installed to the correct density. Unlike fiberglass batts, cellulose does not sag or lose contact with surfaces. We verify depth and density with a post-installation blower door test. The only reason to add more later is if you want to raise the R-value above what was originally installed.

Can I finance home insulation in Maine?

Yes. Efficiency Maine's Green Bank offers financing at 0–7.99% APR with terms from 1 to 10 years. NEIF Energy Plus offers up to $50,000 at 9.99% APR for homeowners combining insulation with other improvements. Both programs are unsecured: no lien on your home. We walk through your options at the free assessment. See the Efficiency Maine rebates and financing page for current details.

Does blown in insulation qualify for Efficiency Maine rebates?

Yes. Blown in cellulose insulation qualifies for Efficiency Maine weatherization rebates of up to $8,000 depending on household income. Rebates cover 40% of project cost for any income level, 60% for moderate income, and 80% for low income households. As a registered Efficiency Maine vendor, we handle all the paperwork and deduct the rebate directly from your invoice. You pay the net amount with no waiting for reimbursement. For questions about combining heat pump and insulation rebates, see our Efficiency Maine rebates page.

Home Insulation in MaineDense-Pack Cellulose, Done Right