Home Insulation - Greater Portland, Maine
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.
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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.
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.
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.
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.
We always air seal before we insulate. It's the right way to do it.
We walk through your home, identify where you are losing heat, and evaluate your current insulation levels. No equipment, no obligation.
Before any insulation goes in, we seal all air bypasses (around wiring, plumbing, recessed lights, and top plates). This is critical for maximum performance.
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.
"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."
"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."
"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."
Project cost depends on your home's size, current insulation levels, and which areas need attention. Typical ranges before Efficiency Maine rebates:
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.
Detailed local pages covering Portland's specific housing types and insulation challenges:
Horizon Homes installs home insulation across Greater Portland and Southern Maine, including:
